VMware 4817V62 - vSphere - PC, Administration Manual

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Table C-5. Memory Data Counters (Continued)
Counter Label Description
Entity
V H R C
swapout Memory Swap
Out
Amount of memory that has been swapped out to disk.
VM
Total amount of memory data that has been
written out to the virtual machine’s swap
file from machine memory by the
VMkernel. This statistic refers to VMkernel
swapping and not to guest OS swapping.
Host
Sum of Memory Swap Out of all powered
on VMs on the host.
n
Stats Type: absolute
n
Unit: kiloBytes
n
Rollup Type: average (min/max)
n
Collection Level: 2(4)
• • ο ο
swapoutRate Memory Swap
Out Rate
Rate at which memory is being swapped from active memory to
disk during the current interval. This counter applies to virtual
machines and is generally more useful than the swapout counter
to determine if the virtual machine is running slow due to
swapping, especially when looking at real-time statistics.
n
Stats Type: rate
n
Unit: kiloBytesPerSecond
n
Rollup Type: average (min/max)
n
Collection Level: 1(4)
• • ο ο
swapped Memory
Swapped
Current amount of guest physical memory swapped out to the
virtual machine’s swap file by the VMkernel. Swapped memory
stays on disk until the virtual machine needs it. This statistic refers
to VMkernel swapping and not to guest OS swapping.
swapped = swapout
n
Stats Type: absolute
n
Unit: kiloBytes
n
Rollup Type: average (min/max)
n
Collection Level: 2(4)
• ο ο ο
swaptarget Memory Swap
Target
Amount of memory available for swapping.
Target value for the virtual machine swap size, as determined by
the VMkernel. The VMkernel sets a target for the level of swapping
for each virtual machine, based on a number of factors.
If Memory Swap Target is greater than Memory Swap, then the
VMkernel will start swapping, causing more virtual machine
memory to be swapped out. This will generally happen quickly. If
Memory Swap Target is less than Memory Swap, then the
VMkernel will stop swapping.
Since swapped memory stays swapped until the virtual machine
accesses it, Memory Swapped can be greater than Memory Swap
Target, possibly for a prolonged period of time. This simply means
that the swapped memory is not currently needed by the virtual
machine and is not a cause for concern.
n
Stats Type: absolute
n
Unit: kiloBytes
n
Rollup Type: average (min/max)
n
Collection Level: 2(4)
• ο ο ο
Appendix C Performance Metrics
VMware, Inc. 341