Installation guide

Table C-2. CPU Data Counters (Continued)
Counter Label Description V H R C
usagemhz CPU Usage in MHz The amount of CPU used, in megahertz, during the interval.
VM
Amount of actively used virtual CPU.
This is the host's view of the CPU
usage, not the guest operating system
view.
Host
Sum of the actively used CPU of all
powered on virtual machines on a host.
The maximum possible value is the
frequency of the processors multiplied
by the number of processors. For
example, if you have a host with four
2GHz CPUs running a virtual machine
that is using 4000MHz, the host is using
two CPUs completely.
4000 ÷ (4 × 2000) = 0.50
n
Stats Type: rate
n
Unit: megaHertz
n
Rollup Type: average(min/max)
n
Collection Level: 1(4)
n
VC/ESX: Yes/Yes
• • • •
used CPU Used Amount of used CPU time.
n
Stats Type: delta
n
Unit: millisecond
n
Rollup Type: summation
n
Collection Level: 3
n
VC/ESX: Yes/Yes
• ο ο ο
wait CPU Wait Amount of CPU time spent in wait state.
n
Stats Type: delta
n
Unit: millisecond
n
Rollup Type: summation
n
Collection Level: 3
n
VC/ESX: Yes/Yes
• ο ο ο
Disk Metrics
The disk metric group tracks statistics for disk input/output (I/O) performance.
Disk I/O counters support metrics for both physical devices and virtual devices. A host reads data from a LUN
(logical unit number) associated with the physical storage media. A virtual machine reads data from a virtual
disk, which is the virtual hardware presented to the Guest OS running on the virtual machine. The virtual disk
is a file in VMDK format.
Table C-3 lists the disk data counters.
NOTE Some counters listed in Table C-3 subsume other counters. For example, kernelLatency includes both
queueReadLatency and queueWriteLatency and the disk usage statistic include both read and write statistics.
In addition, only a subset of the disk counters appear in the overview performance charts. To view all disk
data counters, use the advanced performance charts.
Appendix C Performance Metrics
VMware, Inc. 337