The following table shows the name, collection level, categories, and values for counters that measure disk performance.
The VirtualCenter statistics level is a setting that controls reporting of metrics. Higher settings increase the amount of data collected and can impact performance.
Counter names in orange appear in the VI Client or other GUI.
Counter Name |
VC Stats Level |
Attribute | Value |
---|---|---|---|
usage
Disk Usage |
avg: 1
min: 4 max: 4 |
description | Total amount of data read and written for all disk instances of the host or virtual machine. |
unit | KB | ||
stat type | rate | ||
rollup type | average, minimum, maximum | ||
entity | host and virtual machine (aggregate level only) | ||
read
Disk Read Rate |
3 | description | Amount of data read from disk during the performance interval. |
unit | KBps | ||
stat type | rate | ||
rollup type | average | ||
entity | host and virtual machine (per disk instance only) | ||
write
Disk Write Rate |
3 | description | Amount of data written to disk during the performance interval. |
unit | KBps | ||
stat type | rate | ||
rollup type | average | ||
entity | host and virtual machine (per disk instance only) | ||
numberRead
Disk Read Requests |
3 | description | Number of times data was read from disk during the performance interval. |
unit | number | ||
stat type | delta | ||
rollup type | summation | ||
entity | host and virtual machine (per disk instance only) | ||
numberWrite
Disk Write Requests |
3 | description | Number of times data was written to disk during the performance interval. |
unit | number | ||
stat type | delta | ||
rollup type | summation | ||
entity | host and virtual machine (per disk instance only) | ||
commands
Disk Commands Issued |
3 | description | Number of disk commands issued during the performance interval. |
unit | number | ||
stat type | delta | ||
rollup type | summation | ||
entity | host and virtual machine (per disk instance only) | ||
commandsAborted
Disk Command Aborts |
3 | description | Number of disk commands aborted during the performance interval. |
unit | number | ||
stat type | delta | ||
rollup type | summation | ||
entity | host and virtual machine (per disk instance only) | ||
busResets
Disk Bus Resets |
3 | description | Number of bus resets during the performance interval. |
unit | number | ||
stat type | delta | ||
rollup type | summation | ||
entity | host and virtual machine (per disk instance only) | ||
totalReadLatency
Disk Read Latency |
3 | description | Average time taken for a read by a Guest OS, the sum of kernelReadLatency and physical deviceReadLatency. |
unit | milliseconds | ||
stat type | absolute | ||
rollup type | average | ||
entity | host and virtual machine (per disk instance only) | ||
kernelReadLatency
Kernel Disk Read Latency |
3 | description | Average time spent in the ESX Server VMkernel per read. |
unit | milliseconds | ||
stat type | absolute | ||
rollup type | average | ||
entity | host and virtual machine (per disk instance only) | ||
deviceReadLatency
Physical Device Read Latency |
3 | description | Average time taken to complete a read from the physical device. |
unit | milliseconds | ||
stat type | absolute | ||
rollup type | average | ||
entity | host and virtual machine (per disk instance only) | ||
queueReadLatency
Queue Read Latency |
3 | description | Average time spent in the ESX Server VMkernel queue per read. |
unit | milliseconds | ||
stat type | absolute | ||
rollup type | average | ||
entity | host and virtual machine (per disk instance only) | ||
totalWriteLatency
Disk Write Latency |
3 | description | Average time taken for a write by a Guest OS, the sum of kernelWriteLatency and physical deviceWriteLatency. |
unit | milliseconds | ||
stat type | absolute | ||
rollup type | average | ||
entity | host and virtual machine (per disk instance only) | ||
kernelWriteLatency
Kernel Disk Write Latency |
3 | description | Average time spent in the ESX Server VMkernel per write. |
unit | milliseconds | ||
stat type | absolute | ||
rollup type | average | ||
entity | host and virtual machine (per disk instance only) | ||
deviceWriteLatency
Physical Device Write Latency |
3 | description | Average time taken to complete a write from the physical device. |
unit | milliseconds | ||
stat type | absolute | ||
rollup type | average | ||
entity | host and virtual machine (per disk instance only) | ||
queueWriteLatency
Queue Write Latency |
3 | description | Average time spent in the ESX Server VMkernel queue per write. |
unit | milliseconds | ||
stat type | absolute | ||
rollup type | average | ||
entity | host and virtual machine (per disk instance only) | ||
totalLatency
Disk Command Latency |
3 | description | Average time taken for disk commands by a Guest OS, the sum of kernelCommandLatency and physical deviceCommandLatency. |
unit | milliseconds | ||
stat type | absolute | ||
rollup type | average | ||
entity | host and virtual machine (per disk instance only) | ||
kernelLatency
Kernel Disk Command Latency |
3 | description | Average time spent in the ESX Server VMkernel per command. |
unit | milliseconds | ||
stat type | absolute | ||
rollup type | average | ||
entity | host and virtual machine (per disk instance only) | ||
deviceLatency
Physical Device Command Latency |
3 | description | Average time taken to complete a command from the physical device. |
unit | milliseconds | ||
stat type | absolute | ||
rollup type | average | ||
entity | host and virtual machine (per disk instance only) | ||
queueLatency
Queue Command Latency |
3 | description | Average time spent in the ESX Server VMkernel queue per command. |
unit | milliseconds | ||
stat type | absolute | ||
rollup type | average | ||
entity | host and virtual machine (per disk instance only) |