Installation guide

Table C-3. Disk Data Counters
Counter Label Description
Entity
V H R C
commands Disk Commands
Issued
Number of SCSI commands issued during the collection
interval.
n
Stats Type: delta
n
Unit: number
n
Rollup Type: summation
n
Collection Level: 2
n
VC/ESX: Yes/Yes
• • ο ο
commandsAborted Disk Command
Aborts
Number of SCSI commands aborted during the collection
interval.
n
Stats Type: delta
n
Unit: number
n
Rollup Type: summation
n
Collection Level: 2
n
VC/ESX: Yes/Yes
• • ο ο
deviceLatency Physical Device
Command
Latency
Average amount of time, in milliseconds, to complete a SCSI
command from the physical device.
n
Stats Type: absolute
n
Unit: millisecond
n
Rollup Type: average
n
Collection Level: 2
n
VC/ESX: Yes/Yes
o • ο ο
deviceReadLatency Physical Device
Read Latency
Average amount of time, in milliseconds, to complete read from
the physical device.
n
Stats Type: absolute
n
Unit: millisecond
n
Rollup Type: average
n
Collection Level: 2
n
VC/ESX: Yes/Yes
o • ο ο
deviceWriteLatency Physical Device
Write Latency
Average amount of time, in milliseconds, to write to the
physical device (LUN).
n
Stats Type: absolute
n
Unit: millisecond
n
Rollup Type: average
n
Collection Level: 2
n
VC/ESX: Yes/Yes
o • ο ο
kernelLatency Kernel Disk
Command
Latency
Average amount of time, in milliseconds, spent by VMkernel
processing each SCSI command.
n
Stats Type: absolute
n
Unit: millisecond
n
Rollup Type: average
n
Collection Level: 2
n
VC/ESX: Yes/Yes
o • ο ο
kernelReadLatency Kernel Disk Read
Latency
Average amount of time, in milliseconds, spent by VMKernel
processing each SCSI read command.
n
Stats Type: absolute
n
Unit: millisecond
n
Rollup Type: average
n
Collection Level: 2
n
VC/ESX: Yes/Yes
o • ο ο
vSphere Basic System Administration
338 VMware, Inc.