I’m sure there will be lots added here but this is what I’d recommend for starters:
Us F21 to make sure you are in “Assistance level” “2 = Intermediate”.
Check the “% CPU used” to see that it looks normal and is not pegged at 99+ (A runaway job, etc.).
Check the “% system ASP used” to see that it hasn’t changed much from the day before.
It’s also good to keep this under 80% for system performance reasons.
From the “Work with System Status” screen you can press “F16=Work with disk status” or
Now press “F11=Display storage use” to display your disk Protection Type and Status.
You don’t want yours to look like this:
Unit ASP Type Status
1 1 DPY FAILED
2 1 DPY UNPROT
3 1 DPY UNPROT
4 1 DPY UNPROT
5 1 DPY DEGRADED
6 1 DPY DEGRADED
7 1 DPY DEGRADED
8 1 DPY DEGRADED
9 1 DPY DEGRADED
10 1 DPY DEGRADED
The unit is part of a disk unit subsystem with device parity protection.
Indicates that a decrease in performance has occurred because a component that is not critical has failed. No data is lost due to this failure, but the damaged unit needs to be repaired or replaced.
Indicates that a unit has failed. If another unit fails, data could be lost.
The ASP is under mirrored protection provided by the system software.
Now for the most important task. Check your backup!
We’ve personally known a few IT people that have been fired because their backups were not complete when they were needed the most.
There was also one incident where all the tapes were stolen along with the server because they were kept on top of the server.
We can go into ways to check a backup latter if you’d like.
I would only add to check for any errors.
WRKPRB for system errors
DSPMSG QSYSOPR MSGTYPE(*INQ) for all others