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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 Number of Resets |  |  |
Number of SCSI-bus reset commands issued during the collection interval.
commandsAborted | delta | number | 2 | 4 | summation | Virtual Disk Number of Terminations |  |  |
Number of SCSI commands aborted during the collection interval.
largeSeeks | absolute | number | 4 | 4 | latest | Number of large seeks | VirtualMachine | instance | 5.1 5.5 6.0 6.5 6.7
Number of seeks during the interval that were greater than 8192 LBNs apart
mediumSeeks | absolute | number | 4 | 4 | latest | Number of medium seeks | VirtualMachine | instance | 5.1 5.5 6.0 6.5 6.7
Number of seeks during the interval that were between 64 and 8192 LBNs apart
numberReadAveraged | rate | number | 1 | 3 | average | Average read requests per second | VirtualMachine | instance | 5.0 5.1 5.5 6.0 6.5 6.7
Average number of read commands issued per second to the virtual disk during the collection interval
numberWriteAveraged | rate | number | 1 | 3 | average | Average write requests per second | VirtualMachine | instance | 5.0 5.1 5.5 6.0 6.5 6.7
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 | 5.0 5.1 5.5 6.0 6.5 6.7
Rate of reading data from the virtual disk
readIOSize | absolute | number | 4 | 4 | latest | Read request size | VirtualMachine | instance | 5.1 5.5 6.0 6.5 6.7
Average read request size in bytes
readLatencyUS | absolute | microsecond | 4 | 4 | latest | Read Latency (us) | VirtualMachine | instance | 5.1 5.5 6.0 6.5 6.7
Read latency in microseconds
readLoadMetric | absolute | number | 2 | 2 | latest | Read workload metric | VirtualMachine | instance | 5.0 5.1 5.5 6.0 6.5 6.7
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 5.1 5.5 6.0 6.5 6.7
Average number of outstanding read requests to the virtual disk during the collection interval
smallSeeks | absolute | number | 4 | 4 | latest | Number of small seeks | VirtualMachine | instance | 5.1 5.5 6.0 6.5 6.7
Number of seeks during the interval that were less than 64 LBNs apart
throughput.cont | absolute | millisecond | 4 | 4 | average | Virtual Disk Throughput Contention |  |  |
Average amount of time for an I/O operation to complete successfully
throughput.usage | rate | kiloBytesPerSecond | 4 | 4 | average | Virtual Disk Throughput Usage |  |  |
Virtual disk I/O rate.
totalReadLatency | absolute | millisecond | 1 | 3 | average | Read latency | VirtualMachine | instance | 5.0 5.1 5.5 6.0 6.5 6.7
Average amount of time for a read operation from the virtual disk. Total latency = kernel latency + device latency.
totalWriteLatency | absolute | millisecond | 1 | 3 | average | Write latency | VirtualMachine | instance | 5.0 5.1 5.5 6.0 6.5 6.7
Average amount of time for a write operation to the virtual disk. Total latency = kernel latency + device latency.
vFlashCacheIops | absolute | number | 4 | 4 | latest | Virtual Flash Read Cache I/Os per second for the virtual disk |  |  |
The average virtual Flash Read Cache I/Os per second value for the virtual disk
vFlashCacheLatency | absolute | microsecond | 4 | 4 | latest | Virtual Flash Read Cache latency for the virtual disk |  |  |
The average virtual Flash Read Cache latency value for the virtual disk
vFlashCacheThroughput | absolute | number | 4 | 4 | latest | Virtual Flash Read Cache throughput for virtual disk |  |  |
The average virtual Flash Read Cache throughput value for the virtual disk
write | rate | kiloBytesPerSecond | 2 | 2 | average | Write rate | VirtualMachine | instance | 5.0 5.1 5.5 6.0 6.5 6.7
Rate of writing data to the virtual disk
writeIOSize | absolute | number | 4 | 4 | latest | Write request size | VirtualMachine | instance | 5.1 5.5 6.0 6.5 6.7
Average write request size in bytes
writeLatencyUS | absolute | microsecond | 4 | 4 | latest | Write Latency (us) | VirtualMachine | instance | 5.1 5.5 6.0 6.5 6.7
Write latency in microseconds
writeLoadMetric | absolute | number | 2 | 2 | latest | Write workload metric | VirtualMachine | instance | 5.0 5.1 5.5 6.0 6.5 6.7
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 5.1 5.5 6.0 6.5 6.7
Average number of outstanding write requests to the virtual disk during the collection interval.

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