Performance assistance sought

[BoyeDav]

With the above settings, I can do a backup of our system in about 8 minutes, and that's during the day with all of our users doing their stuff. Last night, it took 75 minutes with hardly anyone on the system. I've tested this both interactively and running as a batch. Cool!

[Hein van den Heuvel]

It's good to see its coming together.

>> I've added $SET RMS/EXTEND=50000 to the begining of my backup script.

Fine

>> I've added this to SYLOGIN.COM:
>> $ set rms/seq/block=127/buff=8
>> $ set rms/ind/buf=20
>> $ set rms/extent=4096

Not so fine, but better than what you have.
You don't want to execute that over and over.
Why not SET RMS/SYS for all, or better still, do the SYSGEN work to have this permanently set.

Also, the sequential fiel tuning is a bit aggresive. You are telling the system to allocate 512 KB for each and every sequential file opened, for each and every process. That's a significant jump from the 32 KB original default.
Also, 127 while the max, is 'odd'.
I would suggest /block=64/buf=3 as an intermediate step system wide.
Individual, well understood, processes may like /bloc=112/buf=8 ! (112 = 7*16)

Regards,
Hein van den Heuvel
HvdH Performance Consulting

[BoyeDav]

Thanks again for the guidance. I'm still a little nervous poking around SYSGEN, but I can implement the other suggestions easily enough.

[BoyeDav]

IO Queue request rates are showing a constant 0.0 for average, min, and max. Things seem to be looking healthier.