Comp.Unix.Aix FAQ -PART 2 of 5

zhaozj2021-02-16  105

Subject: 1.200: Some INFO About Tape Backups

From: Craig Anderson

The Following Supplements The Information on RMT Devices in INFORMATION

InfoExplorer. It is based on my owna Personal Experience with IBM TAPE

Drives Running On Aix 3.1. No Warranty is Expressed or Implied.

Configuring through smit:

Block size (0 = variable length) (all)

Sets The Tape Block size. When Reading, The Block Size Must Be

Set to the block size set when the Tape Was Written. When

Using Some Commands, Tapes Written with Any Block Size Can Be

Read if The Block Size Is Set To 0 (See

"Block Sizes" Below).

Use Device Buffers During Writes (all)

Set to Yes, The Device Will Buffer Data INTERLY ON WRITES.

This Greatly Improves Performance, But Under Certain Cases MAY

Be Undesirable Since The Data In Not Written to Tape Before

Returning a good indication.

Use extended File Marks (8mm only)

Extended File Marks Take Up Much More Space Than Short (OR

Non-extended) File Marks. But Extended File Marks Can Be

Overwritten, Allowing Data Not At The Beginning of Tape To BE

OverWritten (see "file marks" below).

Retension on Tape Change Or Reset (1/4 "ONLY)

IF set to "no" THE TAPE WILL NOT BE RETENTIONEDED

Automatically When the Tape is inserted. Note That this Will

Take Effect Only After The Device IS Used.

FILE MARKS:

Tape Files. Tape Files Are The THE

Result of A Backup / CPIO / TAR / DD TYPE COMMAND, WHERE THE Device IS

Opened, Written to, And Closed. Because Tapes Allow Large

Quantities of Data To Be Written on A Single Tape, Several Backups

(That IS, TAPE Files), May Be Combined On One Physical Tape.

Between Each Tape File Is A "Tape File Mark" or Simply "Filemark". Thase File Marks Are Used by The Device Driver To INDICATE

WHERE ONE TAPE FILE Ends and another begins.

B e

<------- o O ------->

T T

__ ________________________________________

Physical | / | | / | Physical

Beginning | / | TAPE | / | END

Of | / | file | / | of

TAPE | / | Mark | / | TAPE

| _____ / ________ | _______ | __________ / _________ |

Note That there is a distinction betWeen the beginning of tape

(Bot) Side of a file mark and the end of tape (eot) Side of a file

Mark. if the head is on the bot side of a file- mark, "TCTL FSF

1 "Command Will Move Only to the eot side of the same file mark.

With the 1/4 "Tape Drive, Writing Can Only Take Place

Sequentially, or after blank Tape Has Been Detected. You Cannot

Write over data on the Tape (Except At Bot). if you wish to add

Data TO a Tape Which Has Been Written and The Rewound You Should

Space Forward File Mark Until An Error Occurs. Only Then Can

You Start Writing Again.

With an an 8mm tape drive, Writing Can Only Take Place Before Blank

Tape, An Extended File Mark, OR at Bot. Thus if Several Backups

Have Been Made On One Tape and you wish to overwrite one of the

Backups, Position The Tape To The Place You wish To Start Writing

And Issue The Following Commands:

TCTL BSF 1

TCTL EOF 1

THE FIRST Command Skips Back to the Bot Side of the Same File

Mark. The Second Command Rewrites The File Mark (Writing IS

Allowed Before Extended File Marks. The Erase Head Will ERASE

Data Ahead of the Write Head, SO That After Writing The File Markthe Head Will Be Positioned Before Blank Tape. ONLY AFTER TAPE.

May You Start Writing over Data in The Middle of The Tape. (All

Data beyond where you are currently Writing Will Be Lost. Note

That you cannot Write over Sort File Marks. in Order for this To

Work, The Tape Must Have Been Written with Extended File Marks

Use smit to change this.

With the 9-track drive Writing can take place anywhere on The 9 - TAKE

Tape Alth Overwriting Single Blocks of Data IS Not Supported.

On The 8mm Drive Extended Filemarks Use 2.2 Megabytes of Tape and

Can take Up to 8.5 seconds to write. Short filemarks use 184k

AND Take Up to 1.5 seconds to write.

Block Sizes:

When Data IS Written to Tape It Is Written in Blocks. The Blocks

ON A Tape Are Separated by Inter-Record Gaps. It is important to

Understand the structure of the Written Tape in Order To

Understand The Problems Which Can Occur with Changing Block

Sizes.

In Fixed Block Size Mode All Blocks on The Tape Are The Same

Size. The Block Size Set in The Device

Configuration. All read () s and write () S to the Tape Drive Must Be

A Multiple of The Fixed Block size.

In Fixed Block Mode a Read () Will Return AS Many Blocks as Needed

To satisfy the read () request. if a file mark is encountered

While Reading The Tape Only The Data Up Until The File Mark Will

Be returned.

IT is not Possible for the Tape Drive To Read a Tape Whose Block

Size Is Not The Same as The Block Size In The Device

(unless the device configuration is in variable

Size blocks.)

In variable block size (0) Mode, The Blocks Written on the Tape

Are the size of the read () and write () Requests to the DeviceDriver. in this case, the actual block

Changed using the options to the backup commists (tar -c, cpio -c,

Backup -c).

In Variable Mode, Read () Requests Greater Than Size of the Block

On The Tape Will Return Only The Data from The Next Block on The Data

Tape. It is this feature tratows tapes written in Any Block

Size (Fixed or Variable) to read with the dd command (the output

From The Dd Command May Be Piped To Restore, Tar, or CPIo for

Example.) Note That Backup, Tar, And CPIO Cannot Read All Tapes

By Using A Large Block Size Because The Assute Twhere Is An Error

IF The get a short read ().

DD IBS = 128K OBS = 16K if = / dev / rmt0 | ...

The Tape Head Is Always Positioned at an Inter-Record Gap, File

Mark, or Blank Tape after Reading or Writing.

With the 8mm tape drive, using a fixed block size heich is not a

Multiple of 1K is inefficient. The 8mm Tape Drive Always Writes

INTERNALLY IN 1K Blocks. It Simulates The Effect of Variable

Block Sizes, But, for Example, Using A Fixed Block Size of 512

Bytes (or using variable block size and write () ing 512 bytes ATES

Time) Wastes One Half of The Tape Capacity and Gives Only One Half

The maximum transfer rate.

To Figure Out A Tape's Actual Block Size Try:

1). SET the Tape to Variable Block size.

2). "DD if = of = / tmp / dummy BS = 128k count = 1"

3). "Ls -l / tmp / dummy"

4). The number of bytes in "/ tmp / dummy" is The Physical Block size.

Exchanging Data with Non-UNIX and Other Vendors Machines:

Many Tape Drives Support Both Variable and Fixed Block Sizes.

Variable Block Mode Writes Block Sizes The Size of The Write

Command Issued (TAR AND BACKUP Specify this with the -b Option) .IN Fixed Mode, Block Sizes Are Fixed and All Writes Must Be A

Multiple of the fixed block size.

Unix offs and write intel insto

Manageable Pieces (OFTEN 65535, 65534, OR 65532 BYTES) Before

Doing the Actual Reads and Writes. This Means Reads and WRITES OF

64k bytes Are Offen Broken Up Into A 65535 BYTE Record and A 1

Byte Record (In Fixed Mode The Write Will Fail). Block Sizes> =

64K (-C128 and greater) SHOULD BE Avoided for this Reason. AIX

Does Not Break Up Read and Write Requests, But Be Aware of The

Situation On Other Machines.

IF the Tape is Written in an unknown block size kiln unknown block

Device Configuration In Smit To Use Variable Size Blocks, Uses

"DD" Command with a Large Input Block size, and Pipe it to the

Restore Command. for example:

ChDEV -L RMT0 -A Block_size = 0

DD if = / dev / rmt0 ibs = 128k obs = 16k | TAR-TVF-

Subject: 1.201: How do I do remove backup?

There Seems to be several ways of doing this. The first approach is a

One-Liner to Allow Tar to Reference Another Machine's Device. The

Second Is More Complete But Uses A Similar Approach. The Latest

Addition to this section section claims to becoms to support mksysb on a

Remote Machine. Thanks to All the ContiButors.

TAR-B1-C -. | RSH Remotehost "DD IBS = 512 OBS = 1024 of = / dev / TapeDevice"

[Ed .: The usave.sh script has been moved to section 8.06. I've verified

This Script Works Fine. However, IT May Be Slow for Large FileSystems

Since It Creates A Temp file of filenames in / tmp.

There are Also Several Commercial Solutions. One IBM's Sysback / 6000

Product. See Question 1.209 for More Information.open Microsystems Sells a Product Called Distributape Which Supports

MKSYSB TO A Remote Tape Drive Under Aix 3.2, 4.1 and 4.2. Distributape

Supports Remote Tape Drives by Placing a Pseudo Tape Driver on The

Client System, And A Server daemon on the server. More information at

http://www.openmic.com/

Subject: 1.202: How do i backup a multi-disk volume group?

From:

Pack@acd.ucar.edu (Daniel Packman)

[Ed .: i Have Not Verified this Procedure. I Would Actually Recommend

Not to Have ONE Volume Group Span Multiple Disks Unless you really

NEED Such Big Logical Volumes.]

1. if you have a set of three or more disks in a Volume Group

(Typically 3 for 5xx Machines with Three Internal Drives);

With only two, the procedures Outlined here Have to be modified

To Ignore The Fact That You Don't have a quorum in the volume group)

2. IF One Drive Has Failed (Usually Only One Fails At A Time :-))

IT is Possible to Go Through a Service Boot (The Volume Group is Called

Rootvg and one of the 2 good disks on it is caled hdisk0):

IMPORTVG -Y ROOTVG HDISK0

Varyonvg -f -n -m1 rootvg

Thase Commands Will Work, But Give Error Messages. If you wish to mount

A User FileSystem, SAY / U ON Logical Volume / DEV / LV00, THEN

Mount -f / dev / lv00 / v

Will Work ONLY JFSLOG, The Journaled File System Log Device, IS Not

On The Damaged Disk. if IT IS, You Must (and Can in Any Case) Mount To

FILESYSTEM Read-Only:

Mount -f -r / dev / lv00 / v

This Crucial and Rather Obvious Point Baffled Several Level 3 Support

Personnel At Austin As Well As Myself for Almost A Week. Once the File

SYSTEM (S) of Interest Are Available, They Can Be Saved to Tape for

RESTORATION LATER. OF COURSE, One Can Expect Only About Two Thirds of Afilesystem To Be Recoverable IF IT Spans All 3 Physical Disks. One

Other Point To Remember Is That The Standard Boot Procedure from Floppy

Includes The Restore Command But Does Not Include The Backup Command.

*********************************************************** ***********************************

* If you do not home other ket6000 machines at your site it is imperative *

* That You Either build a bootable Tape Which include Either restore or *

* TAR OR CPIO (a Bootable Floppy Set Will Not Have Enough Space) OR at the *

* Very Least Copy Onto a Spare Floppy Backup, CPIO, or tar. The floppy *

* SHOULD BE CREATED WITH BAKUP -IVQ SO That ITS Contents Can Be Read INTO *

* The Memory Resident System After Booting. *

*********************************************************** ***********************************

All is not lost if tar, cpio or backup area available on an undamaged

Disk That Can Be Mounted. Since Tar and Cpio Are IN / BIN, THEY Y Both

Very Well Be unavailable.

IT is a very good idea for those who have tape devices to build a

Bootable Tape with Their Desired Extra Commands in It. FOLLOW THE

INSTRUCTIONS from IBM But Add your desired commands to the folowing

Three files:

/ usr / lpp / bosinst / TAPE2

/ usr / lpp / bosinst / diskette / boot2

/ USR / LPP / BOSIST / DISKETTE / INSLIST

If you have anything other than a minimum memory configuration, you

Should Be Able To Add Many Commands.

Subject: 1.203: How do i put multiple backups on a single 8mm tap?

From:

Kerm@mcnc.org (CARY E. BURNETTE)

There area, Both of which USE /DEV / RMT0.1

WHICH is non-rebinding.

Solution # 1

-----------

To Put Multiple Backups On A Single Tape, Use /Dev /rmt0.1, Which is ANO-REWIND Device, USING Either Rdump or Backup (Both by Name & Inode

Work). Using rdump or backup "byinode" Both generate the message That

The Tape Is Rewinding But Actually Do Not. this is an example

Works on my system:

# rsh remote1 -l root / etc / rdump host: /dev/t0.1 -LEVEL -U / U

# rRSH Remote2 -l root / etc / rdump host: /dev/t0.1 -Level -U / U

# TCTL -F /DEV /RMT0.1 REWIND # REWINDS The TAPE

WHERE I amwareing the command from host.

To restore a Table of Contents of the first I Would Use

# Restore -f /DEV /RMT0.1 -S1 -TV

WHERE The -s1 flag tells restore to go to the first record on the tape.

Type the exact command again to get the second record. The -s (number)

Means Go to Number Record from this Spot. It works pretty Well.

Solution # 2

-----------

Steve Knodle, Educational Resources Center, Clarkson University

I use:

------------------- Dump.sh --------------------

Contentsfile = `Date | DD conv = lcase | SED -E 's / 19 //' | awk '{print $ 6 $ 2 $ 3}'`

Set -X

Level = $ 1

Shift

BACKUP-C 56 - $ level -uf /dev/rmt0.1 /

BACKUP-C 56 - $ level -uf /dev/rmt0.1 / usr

BACKUP-C -B 56 - $ level -uf /dev/rmt0.1 / u

TCTL -F / DEV / RMT0 REWIND

Touch /usr/local/dumps/contents. $ intesfile

Echo "DUMPING /" >> / usr / local / dumps / contents. $ contentsfile

RESTORE -T -S 1 -F /DEV / RMT0.1 >> / USR / local / dumps / contents. $ contentsfile

Echo "DUMPING / USR" >> / usr / local / dumps / contents. $ contentsfile

RESTORE -T -Q -S 1 -F /DEV / RMT0.1 >> / USR / local / dumps / contents. $ contentsfile

Echo "DUMPING / U" >> / usr / local / dumps / contents. $ contentsfile

RESTORE -T -Q -S 1 -F /DEV / RMT0.1 >> / USR / local / dumps / contents. $ contentsfiletctl -f / dev / rmt0 reb

I process the table-of-contents first by a little program That Does

Common prefix encoding, and then compress.

THIS GIVES A TABLE OF Contents File I Can Keep On-line Until The Tape

Is reused.

Solution # 3

-----------

Mount | GREP JFS | CUT -C27- | CUT -D "" -f1 | /

Xargs -i Backup - $ {level} -u -f /dev/rmt1.1 {}> $ {date} .beckup 2> & 1

Subject: 1.204: How Can I make an exact duplicate of a Tape over the network?

The Challenge Here Is Not To Have To Create A Temporary File (Disk Space)

Limitation) and work across heterogeneous networks.

This Script Might Work:

Local = / dev / tape_dev

Remote = / dev / tape_dev

DD if = $ local ibs = 64k obs = 512 | RSH Remote_host DD IBS = 512 OBS = 64K of = $ remote

From: pack@acd.ucar.edu (Daniel Packman)

Daniel Provides The Following Perl Script To Convert from The Known

World's function code to aid for compatibility.

#! / bin / perl

# Wrapper to Convert Input RMT Requests To

# AIX 3.2 IOCTL NUMBERS. WE Pass On All Commands We don't understand

# I 0 m e ->>>> -

# I1 mtfsf -> i11 stfsf forward space file

# I2 mtbsf -> i12 strsf reverse space file

# I3 mtfsr -> i13 Stfsr Forward Space Record

# I4 mtbsr -> i14 strsr Reverse Space Record

# I5 mtrew -> i6 strew rebedind

# I6 mtoffl -> i5 Stoffl Rewind and unload tape

# I7 mtnop -> I0 (no-op? Should Ignore Following Count)

# I8 mtreten-> i8 Streten Retension Tape, Leave At Load Point

# I9 mterase-> i7 step rada, Leave At Load Point

# I10 mteom (position to end of media ... no ibm equivalent?) # I11 mtnbsf (Backward Space File to Bof ... no ibm equivalent?)

@iocs = (10, 11, 12, 13, 14, 6, 5, 0, 8, 7);

Open (RMT, "| | / usr / sbin / rmt") || DIE "can't open pipe to rmt / n";

SELECT (RMT);

$ | = 1;

While () {

S / (^ i) (/ d $) / i $ IOCS [$ 2] /;

EXIT 0 if $ _ = ~ / ^ [qq] /;

Print RMT $ _;}

Exit 0;

Subject: 1.205: What is Tape Block Size of 0?

From:

Benson@odi.com (Benson I. Margulies)

Tape Devices Are Gene Generally Split Into Two Categories: fixed block and

Variable Block. 1/4 "Tape is The Fixed Block, and 8mm is variable.

ON A Fixed Block Size Device, The Kernel Always Sends Data To The Device

In Suitable Block Size Lumps, and Varying The size Passed to Write (2)

(E.G., Via the BS Option to DD) Gives The Kernel More Data To Stream.

On a Variable Block Size Device, The Kernel Writes To The Device

Whatver passed to it. on AN 8mm, IT HAD BETTER Be a Multiple of 1024

TO GET Efficient Tape Usage.

AIX Has The World's Only Variable Block Size 1/4 "Tape Drive. If You" TAPE DRIVE.

Use smit to set the block block size to a nonzero value, AIX Treats the Device

As Fixed Block Size, WHETHER IT IS or Not. by Default, 8mm Drives Are

Set to the Same Size As 1/4 ", 512 Bytes. This is Wasteful, But

Otherwise mksysb and installp would fail.

IF you set the block size to 0, The Device IS Treated As Variable Block

Size, and the size passed to write schemes the physical block size.

Then if You Use a Sensible Block Size to DD, All Should Be Wonderful.

Subject: 1.206: Resetting a Hung Tape Drive

From:

Craig_anderson@kcbbs.gen.nz (Craig Anderson)

A Process Accesses The Tape Drive. The Process Stops, EXITS, or WHATEVER,

Button Hoppens, The Process Cannot Bekilled by Any Signal and The Tape Drive Cannot Be Used by Any Other

Process Until the Machine Is Rebooted.

The Following Should Help:

RESET:

AIX, Like Most Unix Systems Has No Reset Function for Tape Drives. You

Can however send a bus device reset (a standard scsi message) to the

Tape Drive Using The Following Piece of Code. if The Tape Drive Does

NOT RESPOND to the BDR, THEN A SCSI Bus Reset Will Be Sent (and this

Will Reset Every Device On The SCSI Bus. SCSI Bus Resets Are Rather

Extreme So You Should Refrain from Using this Program Unnecessarily.

But There Are Times (LIKE AFTER You've Inserted A Jammed / Old / Bad Tape in

An 8mm Drive), When there's no other woman to reset the device other

To Shutdown and reboot (Obviously You CAN Power Down and Up An External)

Drive to reset it - and this would be the better choice).

This is actally docutented in info, But can be hard to find and

There's No Complete Program.

/ * TAPERST: RESETS The Tape Drive by sending a bdr to the drive. * /

#include

#include

#include

#include

INT main (int Argc, char ** argv)

{

/ * This can be run only by root * /

IF (argc! = 2) {

FPRINTF (stderr, "usage:% s / dev / rmt # / n", argv [0]);

Return 1;

}

IF (OpenX (Argv [1], O_RDONLY, 0, SC_FORCED_OPEN) <0) {

PERROR (Argv [0]);

Return 2;

}

Return 0;

}

Subject: 1.207: How do I restore specific Files from a mksysb tape?

From: Marc Pawliger

Marc@sti.com)

To Recover Specific Files from a Backup Made with mksysb, TRY

$ TCTL FSF 3

$ TAR XVF /DEV /RMT0.1 ./Your/file/name

From: matt willman

Willman.matt@cnf.com)

The Procedure Changed with Aix 4, Which Uses Backup Instead of Tar TO

Write the Tape. for Aix 4 The Procedure IS FOLLOWS:

$ TCTL FSF 3

$ restore -xvf /dev/rmt0.1 ./your/file/name

Subject: 1.208: How do i ie 5GBYTE TAPE ON A 2GBYTE DRIVE?

Posted by:

Bobmet@clam (Robert Metcalf)

To read a 5gByte Tape on a 2gbyte drive, the

Tape Needs to Have Been Created with a density setting of 20.

The Following Is from IBM'S Electronic Asksupport Repository:

R: the 7208 011 5 GB Tape Drive Has Various Density Settings Which Are

As Follows:

----- --------------------------

Densit | Description |

| Settin | | |

----- --------------------------

| 140 | Writes in 5.0GB Mode and |

| | WILL ENABLE DATA COM- |

| | PRESSION; Also, To DO |

| | COMPRESSION You Must USE |

| | "Data Compression = YES" |

----- --------------------------

| 21 | WRITES IN 5.0GB MODE AND |

| | WILL NOT Do DATA COM- |

| | PRESSION |

----- --------------------------

| 20 | WRITES IN 2.3GB Mode and |

| | WILL NOT Do DATA COM- |

| | PRESSION |

----- --------------------------

| 00 | Factory Power-On Default |

| | For 5.0GB Data COM- |

| | PRESSION MODE |

----- --------------------------

The density setting of the 7208 011 must be 20 for it to make a tape

That is readable by the 7208 001.

Subject: 1.209: What CAN SYSBACK Do for ME?

From:

Johnsont@austin.ibm.com (tony johnson)

Sysback provides the flexibility of reasoning Onto the Same System INTHE EXACT SAME Manner, or ONTO a Completely Different System with

Differnet Disk Configuration, Platform Type, Kernel, etc, while

Reporting Any Inconsistencies And Allowing You To Adjust To Fit. for

Instance, You Will Get Warnings IF A Particular Volume Group Cannot BE

Created Because The Original Disks To NOT EXIST, or That Mirroring

Cannot Be Accomplished Because There is no longh disk space

Because the disks area smaller. You can life SELECT The Disks for Each

Volume Group, Reduce or Add Space To FileSystems and LVS, Exclude

Entire Vgs or FileSystems, ETC. You Can Even Add and Delete Mirrors,

Stripe or un-stripe Logical Volumes, ETC.

In Addition, All of the Sysback Functions Can Be Performed Across There

NetWork, Including Network Boot and Network Install, And you can

Perform Striped Backups Across Multipel Tape Drives, Use Sequential

Tape Autoloaders, and Perform Unattended Multi-Volume Backups with

Cron.

ON AIX 3.2, MKSYSB Does Not Retain Paging Space Config, Disk LV

Placement, Mirroring, etc.

ON AIX 4.1, IT Does The release, but does not

Allow Any Flexibility, And Still Does Not Retain Non-Rootvg Volume

Groups (Alth You Can Now Use Additional Commands to Backupa ND)

Restore these. MKSYSB Also Does Not Allow You To Clone ONTO

DiffERENT Platforms (I.E. RSPC -> RS6K -> RS6KSMP).

Subject: 1.210: How can I get my hp 4mm dat to work?

For HP25470 / 80A DDS:

MRS DISABED: SET SWITCHES 3, 6, 7, 8 = 0 and 1, 2, 4, 5 = 1

MRS Enabled: Set Switches 3, 6, 7 = 0 and 1, 2, 4, 5, 8 = 1

Subject: 1.211: How do i copy dat tape?

If you have two drives try tcopy (1). Otherwise the traditional UNIX

Approach IS (DD IF = / DEV / RMT0 BS = 1024B | DD OF = / DEV / RMT1 BS = 1024B) PUT THAT IN A While Lo Multiple

Files. To use drivers from Two Different Machines Either Get The GNU

DD (bundled with gnu tar) or use something like.

$ DD IF = / dev / RMT0 BS = 1024B | RSH Hostname DD OF = / DEV / RMT0 BS = 1024B

Subject: 1.212: How do I speted Up Backups to DLT TAPES?

DLT Tapes Need High Data Rates To Stay in Streaming Mode. To Achieve

Higher Data Rates, Use a Variable Length Block Size by Setting The Fixed

Length Block Size To Zero. Also Use A Buffer Size of About 64kb for

Backup (128 Blocks for Tar).

Subject: 1.300: Some Info About The Memory Management System

From: Michael Coggins

McOG@chvm1.vnet.ibm.com).

1. Does AIX Use More Paging Space Than Other Unix Systems?

Under Many Scenarios, AIX Requires More Paging Space Than Other UNIX

Systems. The Aix VMM IMPLEMENTS A TECHNIQUE CALED "EARLY Allocation of

Paging space ". WHEN A Page IS Allocated in Ram, And It Is Not A

"Client" or A "Persistent" (Disk file) Storage Page, THEN IS

Considered a "Working" Storage Page. Working Storage Pages Are Commonly

An Application's Stack, Data, And Any Shared Memory Segments. So, WHEN

A Program's Stack Or Data Area Is Increased, And Ram Is Accessed, The

VMM Will Allocate Space in Ram and Space on the Paging Device. This

Means That Even Before Ram Is Exhausted, Paging Space IS Used. THIS

Does Not Happen ON Many Other Unix Systems, Although They Do Keep Track

Of Total VM Used.

EXAMPLE 1:

Workstation with 64MB Ram Is Running Only One Small Application That

Accesses a Few Small Files. Everything Fits Into Ram, Including All

Accessed Data. On Aix, Some Paging Space Will Already Be Used. on

Other UNIX Systems, Paging Space Will BE 100% Free. Clearly, this is an

Example That Shows Where We Use more paning space Than the Other Machines.

EXAMPLE 2:

Same Machine As Above, Except We Are in An Environment Where Many

Applications Are Running with INADEQUATE RAM. Also, The System IS

Running Applications That Are Started, Run, Left Idle, And Not in

Constant Use. A Session of Frame Running In A Window, for Example.

What happens is that time Eventually (Theoretical) All Applications Will Be

Paged Out at Least Once. on the aix system and the other systems the

Total Paging Requirements Will Be The Same (Assuming Similar Malloc

Algorithm). The Major Difference Is That The Aix System Allocated The Aix System Allocated The Aix System Allocated

Paging space Pages Before theey atually needed, and the other

Systems Did Not Allocate Them Until Theene Needed. However, MOST

Other Systems Have an Internal Variable That Gets Increment As Virtual

Memory Pages Are Used. Aix Does Not do this. This Can Cause The Aix

System to Run Out of Paging Space (Virtual Memory), Even Though Malloc ()

Continues to return memory. this "feature" Allows Sparse Memory

Segments to Work, But Requires That All Normal users of malloc ()

(Sbrk ()) Know How much Virtual Memory Will Be Available (Actually

Impossible), and to handle a paging space low condition. A Big Problem.

There Area Some Pretty Obvious Pros and Cons To Both Methods of doing

Virtual memory.

2. How much Paging Space Do I NEED?

Concerning the rule of thumb of haVing 2 Times Ram for Paging Space:

This Is Rather Simplistic, AS Are Most Rules of thumb. if The Machine

IS in a "Persistent Storage Environment", Meaning That They Have A Fewsmall Programs, And Lots of Data, They May Not NEED EVEN AS AS 1

Times Ram for Paging Space. for Example, A 1GB Database Server Running

ON A 6000 with 256MB of Ram, And Only Running About 50MB of "Working"

Storage Does Not NEED 512MB of Paging Space, or Even 256MB. They Only

Need The Amount of Paging Space That Will Allow All Their Working

Storage to Be Paged To Disk. this is because the 1GB Database IS

Mostly "Persistent Storage", And Will Require Little or No Paging Space.

Excessive Paging Space May Simply Mean Wasted Disk Space. However,

Avoid Insufficient Paging Space. Tip: don't have more than one pagging

Space Per disk. TIP: PUT LOTS OF RAM IN YOUR System - IT Will Use IT.

3. Why does VMSTAT SHOW FREE RAM PAGES?

AIX Uses Ram As a Possibly huge disk buffer. If you read a file in the

Morning, That File Is Read Into Ram, And Left there. if no osther

Programs Need That Ram, That File Will Be Left in Ram Until The Machine

Is halted. this means if you need the file again, Access Will B

QUICK. IF You NEED THAT RAM, The System Will Simply Use The Pages The

File were. The page................................

Means That You Can Get a huge spetedup in disk access if you have enough

Ram. For Example, A 200MB Database Will Just Ease Into Ram if you have

A 256MB System.

4. SINCE VMSTAT SHOWS NO Free RAM PAGES, AM I OUT OF RAM?

Probably not. Since Disk files will be "mapped" INTO RAM, IF VMSTAT

Shows Lots of Ram Pages Free, Then You Probably Have Too Much Ram (Not

Usual on a risc system / 6000)!

5. Shouldn't the "avm" and the "fre" fields from vmstat add up to something? No "avm" field tells you how much "Active Virtual Memory" AIX

Thinks you are using. this will closely match the Amount of Paging

Space you are using. this number HAS * ABSOLUTELY * NOTHING TO DO with

The Amount of Ram you are use, and does * not * incrude your mapped

Files (Disk files). The Amount of Ram Can Be Determined with

/ usr / sbin / bootinfo -r

6. Why does the "fre" field from Vmstat Sometimes show Lots of Free

RAM PAGES?

This Will Happen After An Application That Used A Lot of Ram Via

"Working" Storage (NOT NFS Storage, and not disk file or "personistent"

STORAGE) EXITS. WHEN RAM PAGES THAT WERE Used by Working Storage (a

Program's Stack and Data Area) Are no longer needed, There is no need to

Leave The Around. Aix Completely Frees these Ram Pages. The Time To

Access these Pages Versus a Ram Page Holding A "Sync'd" mapped file is

Almost Identical. Therefore, There is no need to periodical "flush" RAM.

7. Is The Vmstat "Fre" Field Useful?

The Vmstat "FRE" Field Repesents The Number of Free Page Frames. IF

THE NUMBER IS CONSISTLY Small (Less Than 500 Pages), this is normal.

If The Number IS Consistently Large (Greater Than 4000 Pages), THEN YOU

Have More Memory Than You NEED IN this Machine.

Subject: 1.301: How much shouth t TRUST THE PS MEMORY REPORTS?

From:

Chukran@Austin.vnet.ibm.com

Using "PS VG" Gives a Per Process Tally of Memory Usage for Each Running

Process. Several Fields Give Memory Usage In Different Units, But These

Numbers do not tell the ...

First Of All, The Man Page Not Give An Accurate DescriptionOf The Memory Related Fields. Here Is A Better Description:

RSS - this Tells How Much Ram Resident Memory Is Currently Being Used

For the text and data segments for a particular process in units of

Kilobytes. (this value will always be a multiple of 4 since memory is

Allocated in 4 kb pages).

% MEM - this is The Fraction of Rss Divided by The Total Size of Ram for

A Particular Process. Since Rss Is Subset of The Total Resident

Memory Usage for a Process, The% MEM Value Will Also Be Lower Than Actual.

TRS - TELLS How Much Ram Resident Memory Is Currently Being Used

For the text segment for a particular process in units of kilobytes.

This will always be less..

Size - this Tells How much Paging Space Is Allocated for this process

For the text and data segments in units of kilobytes. if The Executable

File is on a local filesystem, The page space usage for text is zero.

IF The Executable is on an Nfs FileSystem, The Page Space Usage Will BE

Nonzero. This Number May Be Greater Than Rss, or it may not, depending

On How Much of The Process Is Paged in. The Reason Rss Can Be Larger IS

That Rss Counts text Whereas size does not.

Tsiz - this Field Is Absolutely Bogus Because IT IS Not a Multiple of 4

And does not correlalate to any of the other finags.

Thase Fields Only Report On A Process Text And Data Segments. Segment

Size Which Cannot Be Interrogated At this Time Are:

Text Portion of Shared Libraries (segment 13)

Files That Are IN Use. Open Files Are Cached in Memory AS

Individual segments. The Traditional kernel Cache Buffer

Scheme is not used in Aix 3.

Shared Data Segments Created with shmat.

Kernel Segments Such As Kernel Segment 0, Kernel ExtensionSegments, And Virtual Memory Management Segments.

Speaking of kernel segments, The% Mem and Rss Report for Process Zero

Are Totally Bogus for Aix 3.1. The Reason Why Rss Is So Big Is That That

Kernel Segment Zero Is Counted Twice. For Aix 3.2, This Has Been

Changed, But The Whole Story Is Still NOT KNOWN. The RSS Value for

Process 0 Will Report a Very Small Numr of The Swapper Private Data

Segment. It does Not Report The size of the kenel segment 0, Where The Kernel Segment 0, WHERE T

Swapper cotne.

In Summary, PS Is Not a Very Good Tool To Measure System Memory Usage.

IT Can Give You Some Idea Where Of The Memory Goes, But It Leaves

Too Many Questions Unanswered About The Total Usage.

Subject: 1.302: Which Simms Do RS6000'S USE?

This Answer Is Under Construction ... I'm Trying to Collect Details

About Compatable Simms.

RS / 6000 220, 230 USE 2 Pair 70ns PS / 2 style SIMMS

RS / 6000 250, C10 USE 4 Pair 70ns PS / 2 STYLE SIMMS

Subject: 1.303: What is kproc?

KProc (Always PID 514 On Aix 3 and Pid 516 On Aix 4) Is The Kernel's

Idle process.

Subject: 1.304: How do i create a RAM DISK IN AIX?

From: Jeff Wang <

hjiwa@nor.chevron.com>

You can't create a Ram Disk in aix. The Closest Related FunctionAlicity

The Operating System Gives You Is The Ram Disk Buffer. Read 1.300

Sub-section 3.

[Editor's notice: as of 4.3.3 you can. See 1.914]

Subject: 1.305: How much ram (real memory) Does my machine has?

From: Michael Abel / ReNova

<

Michael_abel/resnova%resnovad@notesgw.compuserve.com>

As root: bootinfo -r

As Any User: lsattr - E -L Sys0 -a Realmem

LSDEV-C-C Memory

SHOWS All Memory Adapters. on MCA Systems One May Add Up The ValuesDisplayed for Each Memory Card in Order To Sum Up To The Amount of

Total Memory. on PCI Systems Only One Item (MEM0) IS

Displayed. Additional Information May Be displayed with

Lsattr-E-LMEM0

Thase Commands Were Tested on Various IBM Systems Running Aix RELASES

3.2.5 and 4.1.4

Subject: 1.306: why do pids run non-sequentially?

From: Julianne F. Haugh <

Jfh@Austin.ibm.com>

The answer (I Was there, consider me an authority ...) is that the

PIDS Needed to Be Somewhat Unpredictable. This is Because AIX WAS

Originally Designed with a Number of C2 and B1 Features, and ONE of Those

Is The Notion of Covert Channel Analysis. Sequential PIDS Are A Covert

Channel (Assuming The System Has One Pid Namespace ...) Since The Value

Of the "next" pid is shared by all capitally Running Processes. SO if i

Want to Sneak Some of My Classified Data Out to Your Co-Operating

Non-Classified Program, i can do it by Carefully Controlling the Value

of the "next" PID.

Subject: 1.400: How do i make an informative prospt in the shell?

In The Korn Shell (KSH), The PS1 Variable Is Expanded Each Time IS

Printed, so you can use:

$ export myhost = `Hostname`

$ Ps1 = '$ logname @ $ myhost $ pww / $'

To get, e.g.

BENGSIG @ ieibm1 / u / bengsig $

In the c-shell, us:

% set myhost = `Hostname`

% alias cd 'chdir /! *> / dev / null; set prospt = "$ logname @ $ myhost $ cwd%"

% CD

To get, e.g.

Bengsig @ DKUNIX9 / U / BENGSIG / AIXFAQ%

The Bourne Shell. Use the korn shell instead.

Subject: 1.401: How do i set up ksh for emacs mode command line editing?

The Ksh Has An undocunted Way of binding the arrowkeys to the emacsline editing commands. In Your .Kshrc, Add:

Alias ​​__a = `echo" / 020 "` # UP arrow = ^ p = back a command

Alias ​​__b = `echo" / 016 "` # Down Arrow = ^ n = Down a Command

Alias ​​__c = `echo" / 006 "` # Right Arrow = ^ f = forward a character

Alias ​​__d = `echo" / 002 "` # left arrow = ^ b = back a character

Alias ​​__h = `echo" / 001 "` # Home = ^ a = start of line

TYPE "set -o emacs" or put this line in your .profile.

Also, You Must Have PTF U406855 for this to work in Aix 3.2. The Apar #

For the problem is ix25982, Which may have been superseded.

Subject: 1.402: Listing Files with ls causes a core dump

From: Julianne F. Haugh

Scenario: a Directory That Is Shared By N Users (n> = 200).

Run 'ls -l' in That Directory. It goes for a while, then

Seg Fault (CoredUmp)!

It Only Occurs When The UserNames Are Displayed (Almost Every File IS

OWNED by a Different Person). The -g and -n options Work Fine; Only -L

And -o (Which Shows Owner and Not Group) Cause IT.

I believe That this problem Was corrected by u407548. If you have this

Many Users That You Are Having Core Dump Problems (IT TOOK OVER 200),

You might alsowant to look. getting the ptf That fixes ix31403.

That Apar DEALS with LARGE NUMBERS OF Accounts and Performance Problems

Associated with looking them up.

Subject: 1.403: How do i put my own text int infoExplorer?

With Aix 3.1, You Cannot Do It. Aix 3.2 Has A Product Called

Infocrafter That Allows you to do what.

Subject: 1.404: InfoExplorer ASCII Key BindingsFrom:

Mycroft@hal.gnu.ai.mit.edu (Charles Hannum)

IF you just press' Return 'When IT Starts Up, with' Basic Screen

Operations' Highlighted, You'll Get Some Help.

If you look long enough, you'll find a page named 'use keys and key

Sequences in The InfoExplorer Ascii Interface '. It Describes The Key

Sequences and actions. Here Are A Few To Get You Started.

Keys action

Ctrl-w Moves Between The Navigation Screen and The Reading Screen.

If the navigation screen is displayed, you can Press Ctrl-w To Display

The Reading Screen. if The Reading Screen Is Displayed, You CAN PRESS

Ctrl-w to Display The Navigation Screen.

Ctrl-o makees the menu bar active or inactive. If you text Cursor IS

Located in the text area of ​​the screen, you can pies ctrl-o to make the

Menu Bar Active. if The menu bar is already active, you can press

Ctrl-o To make it it inactive, Which Moves the text cursor to the text isa.

Tab Moves to the next menu bar Option in the menu bar. If a pall-down

Menu Is Not Displayed and You Press The Right Arrow Key, The Next Menu

Bar option is displayed in reverse video.

Subject: 1.405: How Can I Add New MAN Pages To the system?

From:

Horst@faui63.informatik.uni-erlangen.de (Horst Luehrsen)

Put The Man Pages In / usr / man, e.g. /usr/man/man1/tcsh.1 for the TCSH

Man Page. Under Aix 3.1.10, / USR / LIB / Makewhatis Can Be Used to Update

The Makewhatis-Database / USR / Man / Whatis SO APROPOspos and Whatis Know About

The Added ManPages. / USR / LIB / Makewhatis Should Be Available On All 3.2

Versions.

FOR AIX 4.X, You Can Store The Man Pages in The / USR / Share / Man Hierarchy.

/ usr / lib / makewhatis is still there.subject: 1.406: Why can't i ie is nroff?

Nroff and troff aren't in the base installation. It is shipped AS. IT IS SHIPPED AS

Part of Aix 3.2.5 But May Not Be Installed. Use smit to install A. USE SMIT TO INSTALL

Software package called txtfmt.tfs.obj from Your 3.2.5 Distribution

MEDIA.

IN AIX 4.x, You need bos.txt.tfs.

Subject: 1.407: why is my environment only loading onc?

The .profile file is only loaded overce (for your login shell) Subsequent

Shells Should Be Initialized by Setting Env = $ HOME / .KSHRC (for KSH).

Bash Users CAN Use $ Home / .bash_profile for the login shell environment

And $ home / .bashrc.

Subject: 1.408: Where is the 'Nawk' Command ON My AIX SYSTEM?

From: jeff wang

The / bin / Nawk That EXISTS ON MANY UNIX FLAVORS IS A SuperSet of The

'awk' command, revised by The Same Original Authors To include Added

FunctionAlity. All the extra options normally associated with 'nawk'

ON Other Unixes Have Been Incorporated Into The Aix Version of 'awk'

The Aix 'awk' InfoExplorer or Man Pages include Nawk-Specific Features

Such as the "-v" Command line option and atan2 (), rand (), SRAND (),

Match (), SUB (), GSUB (), System (), Close (), Getline functions.

IF Your Aix Version Issing / Bin / Nawk (AS Are Most AIX 3.x

Versions, The Simplest Way To Get This and Maintain Script

Portability Between Unix Platforms Is To Make A / Bin / Nawk Link To

/ bin / awk (as root, of course). if you do not have root privilege or

Do Not Want to Create A / Bin / Nawk Link, To Make The Script Work ON

Different Unixes, You May Have to Test `Uname` First and Set All

'Nawk' References On Aix Runs To / Bin / Awk. If Your Script Is To OnlyRun ON Aix Systems, You Can Just Change All References of 'Nawk' To

'awk' and everything shouth still work okay ... But Check The Aix awk

Script on test data prior to Making actual runs.

[Editor's Note: AIX 4.x Already Contains a Link from / usr / bin / nawk

To / usr / bin / awk.]

------------------------------

1.409: How do i copy infoExplorer (MANPAGES AND MORE) To my hard driving?

From: David Alexander <

UniLink@online.rednet.co.uk>

[Editor's note: while this is docutented in one of the aix manuals

And Covered IN / USR / LPP / BOS / BSDADM (AIX 3 Only), IT Comes Up Offen

ENOUGH I Thought I would include it here.

NOT ALL INFO DATABASESED, SO DO NOT COPY THEM ALESS THE

Customer Specifically Requests Them, or Has Asked for The Software They

Refer to. THESE INSTRUCTIONS Assume You Have Enough Space ON / USR.

Install and mount the infoExplorer CD-ROM as for use of info

From CD-ROM.

Log in as root

Umount / USR / LPP / INFO / LIB / $ LANG

MKDIR / MNT / $ LANG

Mount -V CDRFS -R / DEV / CD0 / MNT / $ LANG

CD /

CD / MNT / $ LANG

CP -R AIX / USR / LPP / INFO / LIB / $ LANG

CP -R AIX2 / USR / LPP / INFO / LIB / $ LANG

CP -R Compnav / USR / LPP / INFO / LIB / $ LANG

Cp -R Hardware / USR / LPP / INFO / LIB / $ LANG

CP -R NAV / USR / LPP / INFO / LIB / $ LANG

CP -R Prog / USR / LPP / INFO / LIB / $ LANG

CP -R UIPROG / USR / LPP / INFO / LIB / $ LANG

Other sections can be copied if required:

Section size

CP -R ADA / USR / LPP / INFO / LIB / $ LANG 7.2 MB

CP -R Assemb / USR / LPP / INFO / LIB / $ LANG 5.23 MB

CP -R CXX / USR / LPP / INFO / LIB / $ LANG 6.52 MB

CP -R DCE / USR / LPP / INFO / LIB / $ LANG 3.8 MB

CP -R ENCINA / USR / LPP / INFO / LIB / $ LANG 2.67 MB

CP -R FORTRAN / USR / LPP / INFO / LIB / $ LANG 6.85 MB

CP -R graph / usr / lpp / info / lib / $ lang 9.75 mbcp -r graph2 / usr / lpp / info / lib / $ lang 4.1 MB

Cp -R Pascal / USR / LPP / INFO / LIB / $ LANG 3.23 MB

UMOUNT / MNT / $ LANG

Eject the CD-ROM

Subject: 1.410: why can't i set my default shell to one we've just installed?

When addition new shells to the system, add the the "shells =" line

In /etc/security/login.cfg so the can be used during ftp and rlogin

By Users Who Use the the the their default shell.

Subject: 1.411: why do get the "Unable to connect socket: 3"

STARTING INFO-Explorer?

It's a bug in the way infod sets the initial permission on the init

/ TMP/.info-help socket. do a chmod 777 on /tmp/fo-help and the

Message Will Go Away. (Charlie McGuire,

McGuire@cs.umt.edu)

This Problem was fixed by apar ix43230, PTF U432315

(Paul Sitz,

Psitz@empros.com)

Subject: 1.412: why can't i write a setuid shell script?

From:

MWW@microfocus.com (michael wojcik)

AIX, as of About The First Release of 3.2.5 * Does Not Allow Suid Scripts.

(It ignores the suid and sgid bits on scripts.) They're a huge security

Hole.

If you really want to run a script suid, you can create a small C Program

That Does a setuid (0) and then system () 's Your Script. (Actually, THE

SetUID () Call isn't Necessary on All Unixes; IIRC, IT's Not On Aix 3.2.5,

BUT YYMV.) Make The Program Suid. Be Very Careful.

There area Other Similar Solutions. You might alsowant to look in

Sudo, Which Handles this Sort of Thing in A Somewhat More Controlled

Manner

* Julianne Frances Haugh (

Jfh@tab.com) Writes:

I raised an Objection to set-id shell scripts Before AIX 3.1 WAS

Golden. ... it was finally done in the 3009 PTF for Aix 3.1.

Subject: 1.500 Which RELESE OF X11 Do I Have? AIX 4.x INCLUDES X11 R5 and MOTIF 1.2.

On Aix 3, Run 'LSLPP -H X11RTE.ObJ'.

IF Your Output Has A Line Similar TO:

01.02.0000.0000 Complete commit 03/04/93 02:05:11 root

You Have X11 R4. if Your Output Has a line Similar TO:

U491068 01.02.0003.0000 Complete commit 07/28/93 12:50:42 root

You Have X11 R5. Some People Also Call Thase AixWindows 1.2.0 and

1.2.3. 'Lslpp-h x11rte.motif1.2.obj' Should Tell you if you are

Running Motif 1.2.

From: Jan Just Keijser <

KeijSerjj@logica.com>

AIX 4.1 and AIX 4.2 Come with x11r5 and motif 1.2.4

AIX 4.3.1 (AND Perhaps 4.3.0) Comes with x11r6.1 and motif 2.1

Some Executables Which Run Fine Using The X11R5 Libraries May Not Run

When use the x11r6.1 libraries; you can specify which x11 libraries to

Use by setting

LibPath = / usr / lpp / x11 / lib / r5: / usr / lib: ...

For x11r5 and

Libpath = / usr / lpp / x11 / lib / r6: / usr / lib: ...

For x11r6.1; by Default,

/usr/lib/libx11.a -> /usr/lpp/x11/lib/r6/libx11.a

And Also for the Other Libraries on Aix 4.3.1.

ON MOST OF THE AIX 4.1.X and 4.2.1 Boxes I have seen the default is

/usr/lib/libx11.a -> /usr/lpp/x11/lib/r4/libx11.a

IE The default libraries are the x11r4 libraries and _not_ the r5

..................

Subject: 1.501: how to prevent ctrl-alt-backspace from killing the x session

Start x with 'xinit -t' to disable ctrl-alt-backspace from stopping x

Subject: 1.502: WHO HAS a TERMCAP / TERMINFO SOURCE for the HFT Console?

The console used on the risc system / 6000, PS / 2 and RT CAN BE USED AS A

Terminal on another system with the termcap below. You can Find this

And Other Termcaps In /Lib/Libtermcap/termcap.src, Including Ibmspecific Ones. The Terminfo Sources Are Stored In /usr/lib/terminfo/*.ti.

This Termcap can also be used from an Aixterm Window.

HF | HFT | HFT-C | IBM8512 | IBM8513 | IBM_High_Function_Terminal: /

: CO # 80: Li # 25: AM: HT: /

: cm = / e [% I% D;% DH: Ti = / E [25; 1h: TE = / E [20h: /

: nd = / e [c: Up = / e [A: do = ^ j: ho = / e [h: /

: BS: sf = / e [S: EC = / E [% DX: /

: cl = / e [h / e [J: CD = / E [J: CE = / e [K: /

: Al = / e [% DL: DL = / e [% DM: Al = / E [L: DL = / E [M: /

: im = / e [4h: EI = / E [4L: mi: /

: DM = / E [4h: ED = / E [4L: /

: so = / e [7m: se = / e [m: ul = / e [4m: ue = / e [m: /

: md = / e [1m: mr = / e [7m: MB = / E [5m: me = / e [m: /

: as = ^ N: AE = ^ o: sc = / e [S: rc = / e [u: /

: Kl = / e [d: kb = ^ h: Kr = / e [c: ku = / e [a: kd = / e [b: kh = / e [h: /

: KN # 10: K1 = / E [001Q: K2 = / E [002Q: k3 = / e [003Q: k4 = / e [004Q: k5 = / e [005Q: /

: k6 = / e [006Q: k7 = / e [007Q: k8 = / e [008Q: k9 = / e [009Q: k0 = / e [010Q: /

: IS = / EB / E [M ^ O / E [? 7h: RS = / EB / E [M ^ O / E [7H / E [H / E "

------------------------------

1.503: How Can I Look At PostScript files? Why is "DPSEXEC" SO LOUSY?

From: marc pawliger

Showps comes with the 1.2.3 (x11r5) Version of the x11rte.ext.obj LPP.

Very nice ps file previewer from adobe. Replaces XpsView Which Came

WITH PRE-1.2.3 Installed AS / USR / LPP / DPS / SHOWPS / SHOWPS

From: vrbass @ atlvmic1 (Vance R. BASS)

You can look at postscript files using Either "xpreview" (in the

OPTIONALLY Installable Text Formatting Services) Or You Can Get

GhostScript and ghostview from a

Comp.Sources.x Server and Build IT

Yourself.

> From the "xpreview" man page:

THE XPREVIEW COMMAND IS An AixWindows 1.2- and Motif 1.1-BasedApplication That Displays Output from The Troff Command on An AixWindows

Display. The Troff Command Output File Must Be Prepared for Any ONE OF

The devx100, Devx100k or devpsc devices. The Xpreview Command ALSO

Displays PostScript language files what begin with% !.

"DPSEXEC" is not intended to be a fulro, but

Rather a Simple DPS Code Debugger. if You Insist on Using It, You CAN

Edit your ps code to remove the "showpage" (Which Will Reset DPSexec

And clear the window "to view single-page files. It does not handle

Multi-page files gracefully.

Subject: 1.504: UNIX: 0 vs `Hostname`: 0

1.) Is there any way to get the machine to check its local host TABLE

First WITHOUT RENAMING RESOLV.CONF?

[AIX 3.2 ONLY]

PTF U412845 Implements An Environment Variable To Set The Resolver

Time Out in Aix 3.2. this allows you to set res_timeout to the number

Of Seconds Before IT Times Out, A Failing A DNS Query The Machine Will

CONSULT / ETC / HOSTS.

2.) How do you tell X Applications Where You Are IF The Console Display

Is UNIX: 0?

From: David L. CROW <

Crow@waterloo.Austin.ibm.com>

I Would Suggest That if You Have R5, Use ": . ". I do

Not Believe That R4 Clients Will Understand: 0, SO I Would Suggest

UNIX: 0 for them.

WITHOUT SPECIFYING UNIX or the Hostname, You Will Get the Fastest

Transport Mechanism. While Currently There All, Two Transport

Methods in the aixwindows x server (Unix Sockets and TCP sockets),

Many Vendors Are Looking At Using Shared Memory As a Transport Method.

If you use: 0 (OR: 0.0 or: 1, ETC.), THEN You Should Get The Best

Performance Regardless of the Available Transport Methods.From: Marc Pawliger

"UNIX: 0" or "hostname: 0" when the x11 shared memory transport

(SMT) Is Installed As Part of The 1.2.3 x11rte.obj (x11r5) Will Incur

a penalty vs. using ": 0" see /usr/lpp/x11/readme.smt

3.) Is there a significant performance penalty incotred by using

`Hostname`: 0 as display?

YES! Using UNIX: 0, You are for unix sockets. Thase Are Much Faster

Than Their TCP Socket Counterparts.

Subject: 1.505: VT100 Key Bindings for AIXTERM

From:

Haedener@iac.unibe.ch

Add this to your .xdefaults file and start your vax session with

'AIXTERM -V -NAME VT100 -E Telnet Myvaxhost'

-----

VT100.VT102: True

VT100.Fullcursor: False

vt100.translations: f1: string (0x1b) String ("OP") / N /

f2: string (0x1b) String ("oq") / N /

f3: string (0x1b) String ("OR") / N /

F4: String (0x1b) String ("OS") / N /

KP_0: String (0x1b) String ("OP") / N /

KP_1: String (0x1b) String ("oq") / N /

KP_2: String (0x1b) String ("OR") / N /

KP_3: String (0x1b) String ("OS") / N /

KP_4: String (0x1b) String ("OT") / N /

KP_5: String (0x1b) String ("ou") / N /

KP_6: String (0x1b) String ("OV") / N /

KP_7: String (0x1b) String ("OW") / N /

KP_8: String (0x1b) String ("OX") / N /

KP_9: String (0x1b) String ("OY") / N /

KP_DIVIDE: STRING (0x1b) String ("oq") / N /

KP_MULTIPLY: STRING (0x1b) String ("OR") / N /

KP_SUBTRACT: STRING (0x1b) String ("OS") / N / KP_ADD: String (0x1b) String ("OM") / N /

kp_enter: string (0x1b) String ("om") / N /

KP_DECIMAL: STRING (0x1b) String ("on") / N /

Next: String (0x1b) String ("ol") / N /

Left: string (0x1b) String ("OD") / N /

Up: String (0x1b) String ("oa") / N /

right: string (0x1b) String ("OC") / N /

backspace: string (0x7f) / N /

Down: String (0x1b) String ("ob")

You Should Also Add

Xenvironment = $ home / .xdefaults

Export Xenvironment

To Your .profile.

Subject: 1.506: Is The A Screen Saver That Does Not Use Excessive CPU?

From: don buchholz <

Buchholz@ese.ogi.edu>

Try Using Xlock with these options:

XLOCK -MODE LIFE-COUNT 1500 -NICE 20-ROOT

From:

Pranav@evolving.com (PRANAV VAKIL)

Use mlock -hide to hide the background. You can also modify the mlock

(/ usr / local / Tools / mlock) Code to allow the standard x screen saver to

Take Effect. The Timeout Value Is Originally Set To 0 Which Means THE

Screen Saver IS Off. Modify this to be 120 (2 minutes) and set the

Interval Time to BE 60 (1 minute). Using these Intervals, I have found

That Over a 24 Hour Period, IT Uses Only .3 CPU Minutes.

Subject: 1.507: WHERE Are The Colors, Available for An X Session, Listed.

/usr/lpp/x_st_mgr/bin/rgb.txt and on Aix 4.2, The File IS

/usr/lpp/x11/lib/x11/rgb.txt

Subject: 1.508: why does my app hang the x server but not an x ​​station?

From: bjorn P. Brox <

Brox@corena.no>

/usr/lpp/x11/readme.smt x Client / Server Communication Uses A 64K

Buffer by default. The size of this buffer is controled by the

X_SHM_SIZE Environment Variable Increasing The size of the buffer Hasbeen Used to Prevent Some Applications from Hanging To X Server :)

Subject: 1.509: How do I switch the control and caps lock key bindings?

If you are running the x window system, you can put the following int

.xmodmaprc

REMOVE LOCK = CAPS_LOCK

REMOVE Control = Control_L

Keysym Control_L = Caps_lock

Keysym Caps_lock = Control_L

Add Lock = Caps_lock

Add Control = Control_L

Hidden Hint: Use (XModMap -e "Pointer = 3 2 1") to make the mouse

Lefty friends.

Subject: 1.510: Missing Fonts?

IF Your XServer Supports X11R5 TRY Running A Font Server (Edit)

/ usr / lib / x11 / fs / config and run fsconf && startsrc -s fs) consult Your

XServer Instructions on now to include a font server in your font

Path.

Subject: 1.511: What's The Termcap Entry for an IBM 3151 Look Like?

#

# Written by Aleksandar Milivojevic,

Alex@srce.hr

# 24.09.1994

#

I2 | IBM3151 | 3151 | IBM 3151 Terminal: /

: am: mi: cr = ^ m: sf = ^ J: CO # 80: Li # 24: CD = / EJ: CE = / EI: cm = / EY% / 040% / 040: /

: CL = / EH / EJ: DC = / EQ: DL = / EO: do = / EB: Le = / Ed: MB = / E4 $ A: MD = / E4 (A: /

: ME = / E4 @ / E> B: MR = / E4! A: ND = / EC: SE = / E4> B: SO = / E4! A: UE = / E4 = B: Up = / EA: /

: US = / E4 "A: KB = ^ h: kd = / EB: kH = / EH: KL = / ed: kr = / Ec: ku = / EA: /

: K1 = / EA / R: K2 = / EB / R: K3 = / EC / R: K4 = / ED / R: K5 = / EE / R: /

: K6 = / EF / R: K7 = / EG / R: K8 = / EH / R: K0 = / EI / R: K0 = / EJ / R: /

: ti = / e> B: te = / e> B: MS: HO = / eh: BL = ^ g: Al = / en: ta = ^ i:

Subject: 1.512: Errors Starting X11 Application Binaries from aixpdslib.

From:

ftp://aixpdslib.seas.ucla.edu/pub/readme_x11r5_stuff>

WE Have Been Aware of The Problem People Have with Dynamic Links

WHEN Running The Prebuilt of X-stuffs from this library.

The Typical Error Messages Will BE:

Could Not Load Program [Program_name]

Member Shr4.o NOT Found or File Not an Archive

Member Shr4.o NOT Found or File Not an Archive

Could Not Load Library Libxt.a [shr4.o]

Error Was: No Such File or Directory

It's Because That We Built the Program Using X11 Libraries of Mit

Which Are Not Compatible with Those of IBM. if this is the case,

Then Please Get The Compressed Tarred File of the Source Code INSTEAD,

And Recompile Them on Your System Using your libraries.

Subject: 1.513: .xshm *, .sm * (Shared Memory) Link Errors Building

Xwindows Applications.

Link Errors That Refer to .xshm * offen Times Are A Result Of Compiling

Applications to take Advantage of the Shared Memory Extension of the x

Server. You May Either Compile without Shared Memory or Load Thae

SHARED MEMORY EXTENSIONS. (See / USR / LPP / X11 / Readme and Readme.smt) a

Script for rebuilding your x server with the shared memory can be found

IN / USR / LPP / X11 / Xamples / Server.

Subject: 1.514: How do i set my display when i login to another machine?

Though this is not a question, specific to Aix, IT APPEARS OFTEN ENOUGH

To Warrant An Answer Here. There Are Lots of Approaches, Some of Which

Are Described in The x Windows FAQ. MOST INVEVE A Little Login Shell

Programing to parse the output of `who` or` WHO am I`.

by

E-siebert@Uchicago.edu Will Help if you are Willing / Able To Install IT

SUID. See The x Windows FAQ and NewsGroup for more information.

Hostwhence is also availabile in the "lsof" smit-installable package onwww-frec.bull.com. The Installation Scripts Use acls to allow hostwhence to

Read / dev / kmem without being set-uid-root.

Subject: 1.515: why doesn't netscape work?

From: "Gary R. Hook" <

Hook@austin.ibm.com>

The Problem Is That Netscape Has StaticLinked Libc Into

Mozilla. When the Aix 3 Libc Code (SetLocale ()) Tries To

Load An Aix 4 Locale, The Two Are INCompABLE and A Core

Dump Ensues. Aix 4 Locales Have to Be loading by Aix 4 libc.

Using lang = c causes a lot of local code to be bypassed, allowing

The Application To Avoid Loading A Non-C Locale, and To Continue

Execution.

> From: colin <

Apollo@randomc.com>

Here Is A Shell Script That Works Around Netscape's Problems By

Setting the lang and classpath environment variables.

#! / bin / sh

LANG = C

Classpath = / path / to / java_30

Export Lang ClassPath

IF [$ # -eq 0]; then

/ path / to / netscape http://your.home.page &

Else

/ PATH / TO / NETSCAPE $ * &

Fi

Subject: 1.600: my named DIES FREQUENTLY, why?

From:

JPE@ee.egr.duke.edu (John P. Eisenger)

Running on 3.2, Named Dies Frequently On Network's Primary Name Server.

Try The Following:

Stopsrc -s named # stop running named

Stenv MallOctype 3.1 # Use 3.1 Memory Allocation Algorithm

/ etc / named ... # don't use smit to start name

You might be a to use startsrc / smit after setting malloctype and get

The Same Effect, But I'm Not Sure.

[According to John, The Problem is malloc () in the named code. HE

Also Suggests Using Berkeley's Bind, Which He Has Ported and Can Be

ftp'ed from

ftp://ftp.egr.duke.edu/archives/bind-4.8.3.tar.gz. -ed]

TWO PTFS SHOULD FIX This Problem. Get U412332 and U414752.Christophe Wolfhugel <

Christophe.wolfhugel@grasp.insa-lyon.fr> Reports

That Bind 4.9 Works Fine On Aix 3.2 and welSout MallOctype = 3.1.

Subject: 1.601: How do I TRACE ETHERNET PACKETS ON AN AIX SYSTEM?

From:

Afx@muc.ibm.de (Andreas Siegert)

Do The Following:

IPTRACE -I EN0 / TMP / IPT

The iptrace backgrounds. Find ITS Process Id and Kill Ithen you are

Ready. Then Run

Ipreport -RNS / TMP / IPT> / TMP / IPR

And Look at the output. The Current Version of Info Does Not Document

THE R, N AND S OPTIONS But They Are Quite Useful for Layering The Output.

Subject: 1.602 What is the authorized way of starting automount at boot time?

From:

Curt@ekhadafi.Austin.ibm.com (Curt Finch)

I put this in my / etc / inittab:

Automount: 2: Once: / usr / etc / automount --t -t -v> /tmp/au.se 2> & 1

I believed dub it authorized.

Jim Salter <

Jsalter@netscape.com> Writes: you can also use the command:

'mkitab "Automount: 2: Once: / usr / etc / ..."' to avoid editing the file by hand.

Subject: 1.603: How do i set a TTY port for Both Dial-in and Dial-out?

Set the mode of the tty to be each either 'shared' or 'delayed'.

Subject: 1.604: How to move or copy Whole Directory Trees Across A Network

The Following Command Will Move An Entire Directory Tree Across A Network

While PreserVing Permissions, Uids and Gids.

$ RSH Remotehost "CD Targetdir; Tar-CBF -." | TAR-XVBF -

Explanation:

THE TAR-CREATE IS RSH'D to the Remote System and is Written To

STDOUT (THE PIPE).

The local system is extracting the tar what being read from

STDIN (The Pipe).

From: ABELONI <

Abeloni@hstern.com.br>

Another Method Is: RCP -RP Host1: / Dir Host2: / DIR

Subject: 1.605: How can I send mail to hosts what cannot be pinged?

From: jupiter.sun.csd.unb.ca! Dedourek (John Dedourek)

AIX 3.2 As Shipped is configured to mobile phone mail to mail addresses

Which include a host name. Many Organizations Use a mail address whose

"host name" part is not a host name (technically an mx name). To change

The Configuration of The Aix Mailer, Login As Root. Then Edit The File

/etc/sendmail.cf to remove the comment marker ("#") at the beginning of

The Line Which Reads:

# Ok mx

Now Rebuild The Machine Readable Form of The Configuration with the CONFIGURATION WITH

Sendmail -bz

And Finally Restart Signal Sendmail To Load The New Configuration by One

Of the folowing:

Reboot

oral

Stopsrc -s Sendmail

Startsrc -s Sendmail

oral

Kill -1 `Cat / etc / sendmail.pid`

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