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Table Of Contents
If snapshot files are consuming high datastore space, consider consolidating them to the virtual disk when
they are no longer needed. Consolidating the snapshots deletes the redo log files and removes the
snapshots from the vSphere Web Client user interface. For information about consolidating the data
center, see the vSphere documentation.
Fault Tolerance Performance Counters
The fault tolerance charts contain information about CPU and memory for fault tolerant virtual machines.
Note The performance charts and help topics for fault tolerance are available only when you have
vSphere Fault Tolerance enabled. If you select a link for a secondary virtual machine in the thumbnail
section of the Resource Pools and Virtual Machines view of the cluster Performance tab, the navigation in
the inventory updates to the primary virtual machine. This occurs because secondary machines are not
displayed in the inventory.
CPU (MHz)
The CPU (MHz) chart displays virtual CPU usage for fault tolerant virtual machines.
This chart is located in the Fault Tolerance view of the virtual machine Peformance tab. It is available
only at collection levels 3 and 4.
Table 1126. Data Counters
Name Description
Usage The average amount of virtual CPU, per CPU instance, in use on the primary and
secondary fault tolerant virtual machines.
n
Counter: usagemhz
n
Stats Type: Rate
n
Unit: Megahertz (MHz)
n
Rollup Type: Average (Minimum/Maximum)
n
Collection Level: 3 (4)
Chart Analysis
A large discrepancy in CPU usage between the primary and secondary virtual machines might indicate
performance problems. The CPU ready, system, and wait times of each virtual machine should be
synchronized. A large discrepancy in these values might indicate performance problems. Consider taking
the following actions.
Table 1127. CPU Performance Enhancement Advice
# Resolution
1 Verify that the primary and secondary hosts are in the same CPU model family and have similar CPU configurations. For best
results, use CPUs with the same stepping level.
2 Verify that the CPU resource reservations set for both virtual machines are consistent within the cluster. VMware HA plans for
a worst-case scenario by considering all powered on virtual machines in a cluster and finding the maximum memory and
CPU reservations.
3 Verify that the network and datastore connections for both virtual machines are similar.
vSphere Monitoring and Performance
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