Monitor paging and spooling activity

If you find that your paging disks have poor response times, you can check whether some of the I/O load has been caused by minidisks with a high activity on the same disk pack.

Use the Minidisk Cache workspace, accessed from the DASD workspace, to monitor minidisk cache usage.

The CP Owned Devices workspace contains several views that display data on the activity of the paging and spooling devices on the overall z/VM® system. You can use this workspace to determine the resource utilization by the paging and spooling devices to identify the busiest devices.

You can also review the data on the Real Storage workspace. This workspace contains the System Page Rate linear gauge chart that shows the I/O paging rate for the whole system. This workspace also contains the Page Wait Queue chart that displays the percentage of all virtual machines in a page wait state. A high percentage of users in a page wait state can indicate a paging bottleneck.