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rob@xxxxxxxxx wrote on Fri, 24 Jul
2015 13:59:36 GMT:

There are times with the "Disk Arm Utilization" chart shows
100% utilization of many of the "arms" on this guest.
At that same time the Host shows CPU utilization of 120-160%.
This host serves up disk for 5 lpars. Four of them are IBM i
and one is AIX.
Disk arm utilization only gets high for this one guest.
We have 0.5CPU allocated to this host. Host is running IBM i
7.2 Power 8.

Does this point to anything in particular? Like:
- Does the host need more CPU?

Yes, running >100% says you don't have enough base entitlement
and you're running shared uncapped.

- Do we need to unload/reload the guest and have more NWSD's,
each with less storage spaces? Like shoot for six NWSD's with
six storage spaces apiece, (just for example)?


100% via WRKDSKSTS isn't really meaningful. I'd be looking at
whether or not collection services is reporting queuing for the
virtual disks. If it is, you need more disks. If it is not,
then don't worry about it.

Of course, bottom line is whether or not jobs are running in the
amount of time you need them to run. End users are getting the
response times they need.





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