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# Virtual Disk 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 virtual disk group of performance counters supports real-time performance metrics (such as latency and read- and write-speeds) for I/O operations on virtual disks.

Counter | StatsType | Unit | Levels | Per Device Level | RollupTypes | Labels | Entity | Instance/ Aggregate | ESX Versions
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
busResets | delta | number | 2 | 4 | summation | Virtual Disk Bus Resets |  |  |
Number of SCSI-bus reset commands issued during the collection interval.
commandsAborted | delta | number | 2 | 4 | summation | Virtual Disk Command Aborts |  |  |
Number of SCSI commands aborted during the collection interval.
numberReadAveraged | rate | number | 1 | 1 | average | Average read requests per second | VirtualMachine | instance | 4.1.0 5.0.0
Average number of read commands issued per second to the virtual disk during the collection interval.
numberWriteAveraged | rate | number | 1 | 1 | average | Average write requests per second | VirtualMachine | instance | 4.1.0 5.0.0
Average number of write commands issued per second to the virtual disk during the collection interval.
read | rate | kiloBytesPerSecond | 2 | 2 | average | Read rate | VirtualMachine | instance | 4.1.0 5.0.0
Rate of reading data from the virtual disk.
readLoadMetric | absolute | number | 2 | 2 | latest | Read workload metric | VirtualMachine | instance | 5.0.0
Storage DRS virtual disk metric for the read workload model.
readOIO | absolute | number | 2 | 2 | latest | Average number of outstanding read requests | VirtualMachine | instance | 5.0.0
Average number of outstanding read requests to the virtual disk during the collection interval.
throughput.cont | absolute | millisecond | 2 | 4 | average | Virtual Disk Throughput Contention |  |  |
Average amount of time for an I/O operation to complete.
throughput.usage | rate | kiloBytesPerSecond | 2 | 1 | average | Virtual Disk Throughput Usage |  |  |
Virtual disk I/O rate.
totalReadLatency | absolute | millisecond | 1 | 1 | average | Read latency | VirtualMachine | instance | 4.1.0 5.0.0
Average amount of time for a read operation from the virtual disk. Total latency = kernel latency + device latency.
totalWriteLatency | absolute | millisecond | 1 | 1 | average | Write latency | VirtualMachine | instance | 4.1.0 5.0.0
Average amount of time for a write operation to the virtual disk. Total latency = kernel latency + device latency.
write | rate | kiloBytesPerSecond | 2 | 2 | average | Write rate | VirtualMachine | instance | 4.1.0 5.0.0
Rate of writing data from the virtual disk.
writeLoadMetric | absolute | number | 2 | 2 | latest | Write workload metric | VirtualMachine | instance | 5.0.0
Storage DRS virtual disk metric for the write workload model.
writeOIO | absolute | number | 2 | 2 | latest | Average number of outstanding write requests | VirtualMachine | instance | 5.0.0
Average number of outstanding write requests to the virtual disk during the collection interval.

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