1. The file system is full: DF -K can check the usage rate of the file system in K-based. (90%, need to be adjusted) 2. Check the system error log Use errpt | more to check the clear existing log: Errclear 0 3. Check the system legal / illegal login situation Use the Last command to check where the landing is. 4. Check if the system has huge core file generation to use Find / -Name Core -PRINT to check. For the core file, it is usually directly deleted. 5. System Performance Check: a) CPU Performance: Use VMSTAT, TOPAS to check B) Memory usage: Also use TOPAS, VMSTAT to check C) Check IO balance usage: Use iostat to check D) exchange space usage: Use LSPS - a to check 6. Mail check 7. Diag one month
