which two counters would be higher than normal?

An administrator receives a complaint that a virtual machine is performing poorly. The user attributes the issue to poor storage performance.

If the storage array is the bottleneck, which two counters would be higher than normal? (Choose two.)

A.
Average device latency per command, in milliseconds (DAVG per cmd)

B.
Average ESXi VMKernel latency per command, in milliseconds (KAVG per cmd)

C.
Average virtual machine operating system latency per command, in milliseconds (GAVG per cmd)

D.
Number of SCSI reservation conflicts per second (CONS per second)

4 Comments on “which two counters would be higher than normal?

  1. portergoh says:

    Ans should be A&B

    http://blogs.vmware.com/vsphere/2012/05/troubleshooting-storage-performance-in-vsphere-part-1-the-basics.html

    So what are the rule of thumb indicators of bad storage performance?

    • High Device Latency: Device Average Latency (DAVG) consistently greater than 20 to 30 ms may cause a performance problem for your typical application.

    • High Kernel Latency: Kernel Average Latency (KAVG) should usually be 0 in an ideal environment, but anything greater than 2 ms may be a performance problem.


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