Hello Tim,
Correct it is not necessarily a VM(s) running on this host just any that have data components residing on this hosts disk-groups.
So, as with any performance issues a few things need to be established:
- Do these readings vary greatly from a longer-term workload baseline?
- Is this increased load negatively impacting performance of other VMs or just stands-out on a graph?
- Do these high-readings correlate with any specific times or activities? (e.g. Back-up jobs, provisioning/creating VMs, 9AM log-in/boot-storms, large resyncs, huge file-server transfers).
You could start looking at potential VMs that are causing increased load by looking at :
- VM metrics in vCenter:
pubs.vmware.com/vsphere-60/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-60-monitoring-performance-guide.pdf
- vSAN Observer (or Sexigraf if it gives drill-down of each disk) - specifically if you can identify single disks/disk-groups that see huge IO and at the same time see similarly high usage on another hosts disk/disk-group, then the data components of the VM responsible will be on both of these (assuming FTT=1 Objects).
- esxtop (for both disk IO and VM IO)
Great resource for this from depping:
http://www.yellow-bricks.com/esxtop/
You can also set up cron job to measure over a period of time:
kb.vmware.com/kb/1033346
Bob
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