VSAN-Troubleshooting-Reference-Manual

Diagnostics and Troubleshooting Reference Manual – Virtual SAN
As we can see, the VSAN Disks view also displays the same high latency observed in
the VSAN Client view. This view is the physical disks view, and is basically
representative of the latency seen by Virtual SAN accessing physical disks. In a
nutshell, this rules out the Virtual SAN network as the cause of the latency issue.
Another cause of latency could be CPU. Perhaps the CPUs are maxed out, and not
able to process I/O quickly enough. We can check the CPU utilization via ‘PCPU’
view. It shows the following:
The ALL PCUs chart is green, and overall the CPU utilization is not very high. Also, all
of the Virtual SAN “worldlets” are showing green and none of them are maxed out.
The impression from this view is that there are no CPU issues, so this also rules out
CPU as being the root cause of the latency issue.
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