Disk latency


Below is Kernel disk latency and physical device command latency.

Kernel disk latency: Is the amount of the time vmkernel took to process SCSI command, which is kind of queue on

vmkernel side as it has got lot of stuff to process.ideal counter is 0-1 millisecond

Physical device command latency: it is amount of time taken by physical device to complete scsi, here physical device start from HBA, Storage switch and till it reaches storage port. Ideal counter is 15 millisecond.

image

If you see above, both the counters are showing average value more than ideal value. It is all because the way I configured my system.

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6 comments on “Disk latency

  1. It’s interesting to see the latency of your system, but you don’t go into the actual causes. I suspect many people who find this page are looking for what areas need looking in to and / or a potential solution. “It is all because the way I configured my system” is far too vague to be helpful.

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