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# Datastore Counters

Performance counters are modeled using the PerfCounterInfo data object type. Each instance of a PerfCounterInfo data object contains metadata about a specific metric available from the system. The datastore group of performance counters supports real-time performance metrics (such as latency and read- and write-speeds) for I/O operations on datastores.

Counter | StatsType | Unit | Levels | Per Device Level | RollupTypes | Labels | Entity | Instance/ Aggregate | ESX Versions
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
busResets | absolute | number | 2 | 2 | summation | Bus resets | Datastore | instance |
Number of SCSI-bus reset commands issued during the collection interval.
commandsAborted | absolute | number | 2 | 2 | summation | Datastore Command Aborts | Datastore | instance |
Number of SCSI commands aborted during the collection interval.
datastoreIops | absolute | number | 1 | 1 | average | Storage I/O Control aggregated IOPS | HostSystem | instance | 4.1.0 5.0.0
Aggregate number of IO operations on the datastore.
datastoreMaxQueueDepth | absolute | number | 1 | 1 | latest | Storage I/O Control datastore maximum queue depth | HostSystem | instance | 5.0.0
datastoreNormalReadLatency | absolute | number | 2 | 2 | latest | Storage DRS datastore normalized read latency | HostSystem | instance | 5.0.0
datastoreNormalWriteLatency | absolute | number | 2 | 2 | latest | Storage DRS datastore normalized write latency | HostSystem | instance | 5.0.0
datastoreReadBytes | absolute | number | 2 | 2 | latest | Storage DRS datastore bytes read | HostSystem | instance | 5.0.0
datastoreReadIops | absolute | number | 1 | 1 | latest | Storage DRS datastore read I/O rate | HostSystem | instance | 5.0.0
datastoreReadLoadMetric | absolute | number | 4 | 4 | latest | Storage DRS datastore read workload metric | HostSystem | instance | 5.0.0
datastoreReadOIO | absolute | number | 1 | 1 | latest | Storage DRS datastore outstanding read requests | HostSystem | instance | 5.0.0
datastoreWriteBytes | absolute | number | 2 | 2 | latest | Storage DRS datastore bytes written | HostSystem | instance | 5.0.0
datastoreWriteIops | absolute | number | 1 | 1 | latest | Storage DRS datastore write I/O rate | HostSystem | instance | 5.0.0
datastoreWriteLoadMetric | absolute | number | 4 | 4 | latest | Storage DRS datastore write workload metric | HostSystem | instance | 5.0.0
datastoreWriteOIO | absolute | number | 1 | 1 | latest | Storage DRS datastore outstanding write requests | HostSystem | instance | 5.0.0
maxTotalLatency | absolute | millisecond | 3 | 3 | latest | Highest latency | VirtualMachine HostSystem | aggregate | 5.0.0
Highest latency value across all datastores used by the host.
numberReadAveraged | rate | number | 1 | 1 | average | Average read requests per second | VirtualMachine HostSystem Datastore | instance | 3.5.0 4.0.0 4.1.0 5.0.0
Average number of read commands issued per second to the datastore during the collection interval.
numberWriteAveraged | rate | number | 1 | 1 | average | Average write requests per second | VirtualMachine HostSystem Datastore | instance | 3.5.0 4.0.0 4.1.0 5.0.0
Average number of write commands issued per second to the datastore during the collection interval.
read | rate | kiloBytesPerSecond | 2 | 2 | average | Read rate | VirtualMachine HostSystem Datastore | instance | 3.5.0 4.0.0 4.1.0 5.0.0
Rate of reading data from the datastore.
sizeNormalizedDatastoreLatency | absolute | microsecond | 1 | 1 | average | Storage I/O Control normalized latency | HostSystem | instance | 4.1.0 5.0.0
Normalized latency in microseconds on the datastore. Data for all virtual machines is combined.
throughput.contention | absolute | millisecond | 2 | 1 | average | Datastore Throughput Contention | Datastore | instance | 3.5.0 4.0.0 4.1.0 5.0.0
Average amount of time for an I/O operation to the datastore or LUN across all ESX hosts accessing it.
throughput.usage | absolute | kiloBytesPerSecond | 2 | 1 | average | Datastore Throughput Usage | Datastore | instance | 3.5.0 4.0.0 4.1.0 5.0.0
The current bandwidth usage for the datastore or LUN.
totalReadLatency | absolute | millisecond | 1 | 1 | average | Read latency | VirtualMachine HostSystem | instance | 4.1.0 5.0.0
Average amount of time for a read operation from the datastore. Total latency = kernel latency + device latency.
totalWriteLatency | absolute | millisecond | 1 | 1 | average | Write latency | VirtualMachine HostSystem | instance | 4.1.0 5.0.0
Average amount of time for a write operation to the datastore. Total latency = kernel latency + device latency.
write | rate | kiloBytesPerSecond | 2 | 2 | average | Write rate | VirtualMachine HostSystem Datastore | instance | 3.5.0 4.0.0 4.1.0 5.0.0
Rate of writing data to the datastore.

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