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.

Level 1 collects resource use averages (but not for devices), uptime, heartbeat, and data for DRS (Distributed Resource Scheduler).
Level 2 also includes usage summation and rollup types for the items above.
Level 3 also collects device metrics in all the categories above.
Level 4 also includes maximum and minimum rollup types.

Counter names in orange appear in the VI Client or other GUI.

GROUP NAME: disk

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)