Counters for Disk Performance

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.

GROUP NAME: disk

Counter Name VC Stats
Level
Category Value
usage avg: 1
min: 4
max: 4
unit KB
description Total size of data read and written for all disk instances of the host or virtual machine.
stat type rate
rollup type average, minimum, maximum
entity host, virtual machine (aggregate level only)
read 3 unit KBps
description Amount of data read from disk during the defined interval.
stat type rate
rollup type average
entity host, virtual machine (per disk instance only)
write 3 unit KBps
description Amount of data written to disk during the defined interval.
stat type rate
rollup type average
entity host, virtual machine (per disk instance only)
numberRead 3 unit number
description Number of times data was read from disk during the defined interval.
stat type delta
rollup type summation
entity host, virtual machine (per disk instance only)
numberWrite 3 unit number
description Number of times data was written to disk in the defined interval.
stat type delta
rollup type summation
entity host, virtual machine (per disk instance only)
commands 3 unit number
description Number of disk commands issued during the defined interval.
stat type delta
rollup type summation
entity host, virtual machine (per disk instance only)
commandsAborted 3 unit number
description Number of disk commands aborted during the defined interval.
stat type delta
rollup type summation
entity host, virtual machine (per disk instance only)
busResets 3 unit number
description Number of bus resets during the defined interval.
stat type delta
rollup type summation
entity host, virtual machine (per disk instance only)
totalReadLatency 3 unit milliseconds
description Average time taken for a read by a Guest OS, the sum of kernelReadLatency and physical deviceReadLatency.
stat type absolute
rollup type average
entity host, virtual machine (per disk instance only)
kernelReadLatency 3 unit milliseconds
description Average time spent in the ESX Server VMkernel per read.
stat type absolute
rollup type average
entity host, virtual machine (per disk instance only)
deviceReadLatency 3 unit milliseconds
description Average time taken to complete a read from the physical device.
stat type absolute
rollup type average
entity host, virtual machine (per disk instance only)
queueReadLatency 3 unit milliseconds
description Average time spent in the ESX Server VMkernel queue per read.
stat type absolute
rollup type average
entity host, virtual machine (per disk instance only)
totalWriteLatency 3 unit milliseconds
description Average time taken for a write by a Guest OS, the sum of kernelWriteLatency and physical deviceWriteLatency.
stat type absolute
rollup type average
entity host, virtual machine (per disk instance only)
kernelWriteLatency 3 unit milliseconds
description Average time spent in the ESX Server VMkernel per write.
stat type absolute
rollup type average
entity host, virtual machine (per disk instance only)
deviceWriteLatency 3 unit milliseconds
description Average time taken to complete a write from the physical device.
stat type absolute
rollup type average
entity host, virtual machine (per disk instance only)
queueWriteLatency 3 unit milliseconds
description Average time spent in the ESX Server VMkernel queue per write.
stat type absolute
rollup type average
entity host, virtual machine (per disk instance only)
totalLatency 3 unit milliseconds
description Average time taken for disk commands by a Guest OS, the sum of kernelCommandLatency and physical deviceCommandLatency.
stat type absolute
rollup type average
entity host, virtual machine (per disk instance only)
kernelLatency 3 unit milliseconds
description Average time spent in the ESX Server VMkernel per command.
stat type absolute
rollup type average
entity host, virtual machine (per disk instance only)
deviceLatency 3 unit milliseconds
description Average time taken to complete a command from the physical device.
stat type absolute
rollup type average
entity host, virtual machine (per disk instance only)
queueLatency 3 unit milliseconds
description Average time spent in the ESX Server VMkernel queue per command.
stat type absolute
rollup type average
entity host, virtual machine (per disk instance only)