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Disk Latency - Performance Issue

We are currently looking at an issue with performance within our virtualised estate. We can't see anything obviously wrong with CPU or memory, however we noticed the 'Highest Latency' value on each of the hosts seem high.

Of the four ESX hosts (VMware 5.1), we can see that the Highest Latency maximum value is 21ms, 275ms, 40ms and 30ms.

We notice the issues notably in the morning when people are logging on to their various systems. Once they've gone through that more intensive part of the day, things seem to settle down and average latency values are 3ms, 7ms, 4ms and 7ms.

During these peak times are the above maximum values likely to be causing an issue?

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8/22/2022 - Mon