Maximum vSphere™ by Eric Siebert & Simon Seagrave

Author:Eric Siebert & Simon Seagrave [Siebert, Eric & Seagrave, Simon]
Language: eng
Format: epub
Publisher: Prentice Hall
Published: 2011-02-14T22:00:00+00:00

%Swap Wait Time (SWPWT)

The last esxtop/resxtop metric that we will look at in this section on memory is located on the CPU’s memory resource utilization view. So, once again, let’s return to this view by pressing the c button. By default, the swap wait time (%SWPWT) field is found on the far right-hand side of the screen and is a useful field to first check when a VM is experiencing slow or unresponsive performance. This field, newly introduced with vSphere, indicates how long a VM spends waiting for the VMkernel to swap required memory pages from disk.

In extreme cases, as seen in Figure 7.20, high %SWPWT figures are a sure indication of a physical memory oversubscription issue, as the VMs are spending large lengths of time waiting on the VMkernel to retrieve memory pages that have been written down to disk.

Figure 7.20 The %SWPWT field indicates the percentage of time a VM spends waiting for the VMkernel to swap memory from disk.

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