Datastore

Object	Counter	Instance	Definition
VMDatastore	deviceReadLatency	Host name:disk name	The average amount of time taken to complete a read from the physical device. This is the time from the device to the host HBA (in milliseconds).
VMDatastore	deviceWriteLatency	Host name:disk name	The average amount of time taken to complete a write to the physical device. This is the time from the host HBA to the device (in milliseconds).
VMDatastore	diskPressure	_Total	The ratio of allocated storage to storage capacity, expressed as a percentage. This percentage can be greater than 100 if thin-provisioning (storage overcommit) is used extensively. See related metric ProvisionedGB.
VMDatastore	freeGB	_Total	Amount of datastore space that is not currently used.
VMDatastore	IOPS	Host name	Aggregate number of I/O operations on the datastore per host.
VMDatastore	IOPS	_Total	Number of input/output operations per second, calculated as total of (reads + writes) divided by the collection interval.
VMDatastore	IOPS	Host name:disk name	Aggregate number of I/O operations on the datastore per second.
VMDatastore	MaxDeviceLatency	_Total	Highest physical device latency value on the datastore during the collection interval.
VMDatastore	MaxDeviceReadLatency	_Total	Highest physical device latency value on the datastore (in milliseconds) for read operations.
VMDatastore	MaxDeviceWriteLatency	_Total	Highest physical device latency value on the datastore (in milliseconds) for write operations.
VMDatastore	ProvisionedGB	_Total	Amount of space in GB that is provisioned (allocated) on the datastore. This can exceed the actual capacity of the datastore if thin-provisioning is used extensively (storage overcommit).
VMDatastore	readRateKB/s	_Total	Average read rate per second for the datastore (in KB).
VMDatastore	unknownFilesGB	_Total	Amount of storage space (in GB) occupied by files unknown to vCenter (orphaned snapshots, orphaned VMs, or manually uploaded files such as ISO, and so on) on the datastore.
VMDatastore	usedPct	_Total	Percentage of space in use on the VMFS. That is, diskUse vs. diskSize.
VMDatastore	VMObservedLatency	_Total	The average datastore latency as seen by virtual machines.
VMDatastore	vmTotal	_Total	Number of VMs whose disks reside on the datastore. This number includes both virtual machines and VM templates.
VMDatastore	writeRateKB/s	_Total	Average write rate per second for the datastore (in KB).

SIOC/SDRS-Datastore

Object	Counter	Instance	Definition
VMDatastore	SDRS Normalized Read Latency	_Total	Storage DRS datastore normalized read latency.
VMDatastore	SDRS Normalized Write Latency	_Total	Storage DRS datastore normalized write latency.
VMDatastore	SDRS Outstanding Read Requests	_Total	Average number of outstanding read requests to the datastore during the collection interval.
VMDatastore	SDRS Outstanding Write Requests	_Total	Average number of outstanding write requests to the datastore during the collection interval.
VMDatastore	SDRS Read IOPS	_Total	Average number of disk read commands completed on each datastore, per second.
VMDatastore	SDRS Write IOPS	_Total	Average number of disk write commands completed on each datastore, per second.
VMDatastore	SIOC Aggregated IOPS	_Total	Average number of I/O operations per second on the datastore, aggregated across all hosts and virtual machines accessing the datastore.
VMDatastore	SIOC Max Queue Depth	_Total	Maximum queue depth set in the HBA driver of all the hosts.
VMDatastore	SIOC Normalized Latency	_Total	Latency that is monitored by Storage I/O Control to detect congestion on the datastore.

Host COS Partition

Object	Counter	Instance	Definition
VMDatastore	freeMB	partition name	The amount of free space in MB on the COS partition.
VMDatastore	usedPct	partition name	The amount of free space in percent on the COS partition.