Redhat Enterprise Linux As V4.0red Hat Enterprise Linux 3 Update 3 ES (x86) Red Hat Enterprise Linux 3 Update 4 As (x86)
First of all, they are redhat enterprise Linux, referred to as RHEL.
As = advanced server
ES = Enterprise Server
There is no difference in the function of AS, ES, just on the service level, the number of supported CPUs and the number of memory, such as ES only support two CPUs, maximum 16G memory. AS and ES, you can see here:
http://www.redhat.com/software/rhel/compare/
I found that regardless of x86, or itanium version, RHEL's last three plates are exactly the same, that is, the package is exactly the same. The first disk actually doesn't have a package, just enable the installer to determine the installation file package.
3 and 4 refer to the version number, the latest is 4.0, use 2.6.9 kernel, 3.0 use 2.4.x kernel.
At the same time, 4.0 also added a lot of new features, except for the new features brought by the kernel, 4.0 also uses LVM2, using MDADM instead of RAIDTools management RAID (of course, 3.0 you can also install MDADM).
Many packages are updated, such as OpenSSL, OpenSsh, MySQL, etc. ...
Update 3 and 4 refers to the upgrade package on this version. Update 4 is the fourth edition, must be better than the third edition, you can understand: as3 update 4 = 3.4 or 3.04, update3 I don't have to say it?
If it is a primary user, it is recommended to use RH, and there are more information, and compile, the installer is relatively simple, easy.
