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Device Metrics for Datastores
Device metrics provide information about device performance.
Table 5-61. Devices Metrics for Datastores
Metric Key Metric Name Description
devices | busResets_summation Bus Resets Number of bus resets that occurred
during the performance interval.
devices | commandsAborted_summation Commands Aborted Number of aborted commands.
devices | commands_summation Commands Issued Number of disk commands issued in the
performance interval.
devices | totalLatency_average Disk Command Latency (ms) Average time taken for a command from
the perspective of a guest operating
system. This metric is the sum of Kernel
Disk Command Latency and Physical
Device Command Latency metrics.
devices | totalReadLatency_average Disk Read Latency (ms) Average time taken for a read from the
perspective of a guest operating system.
This metric is the sum of the Kernel Disk
Read Latency and Physical Device Read
Latency metrics.
devices | totalWriteLatency_average Disk Write Latency (ms) Average amount of time for a write
operation to the datastore. Total latency
is the sum of kernel latency and device
latency.
devices | kernelLatency_average Kernel Disk Command Latency
(ms)
Average time spent in ESX Server
VMKernel per command.
devices | kernelReadLatency_average Kernel Disk Read Latency (ms) Average time spent in ESX host VMkernel
per read.
devices | kernelWriteLatency_average Kernel Disk Write Latency (ms) Average time spent in ESX Server
VMKernel per write.
devices | number_running_hosts Number of Running Hosts Number of running hosts that are
powered on.
devices | number_running_vm Number of Running VMs Number of running virtual machines that
are powered on.
devices | deviceLatency_average Physical Device Command
Latency (ms)
Average time taken to complete a
command from the physical device.
devices | deviceReadLatency_average Physical Device Read Latency
(ms)
Average time taken to complete a read
from the physical device.
devices | queueLatency_average Queue Command Latency (ms) Average time spent in the ESX Server
VMKernel queue per command.
devices | queueReadLatency_average Queue Read Latency (ms) Average time spent in the ESX Server
VMKernel queue per read.
devices | queueWriteLatency_average Queue Write Latency (ms) Average time spent in the ESX Server
VMKernel queue per write.
devices | read_average Read Rate (KBps) Amount of data read during the
collection interval.
devices | numberRead_summation Read Requests Number of times data was read from the
disk during the collection interval.
devices | numberReadAveraged_average Reads per second Average number of read commands
issued per second to the datastore during
the collection interval.
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