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# Storage Path 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 storage path group of performance counters supports real-time performance metrics (such as latency and read- and write-speeds) for I/O operations on a storage path.

Counter | StatsType | Unit | Levels | Per Device Level | RollupTypes | Labels | Entity | Instance/ Aggregate | ESX Versions
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
busResets | delta | number | 2 | 3 | summation | Storage Path Bus Resets |  |  |
Number of SCSI-bus reset commands issued during the collection interval
commandsAborted | delta | number | 2 | 3 | summation | Storage Path Command Terminations |  |  |
Number of SCSI commands terminated during the collection interval
commandsAveraged | rate | number | 3 | 3 | average | Average commands issued per second | HostSystem | instance | 5.0 5.1 5.5 6.0 6.5
Average number of commands issued per second on the storage path during the collection interval
maxTotalLatency | absolute | millisecond | 3 | 3 | latest | Highest latency | HostSystem | aggregate | 5.0 5.1 5.5 6.0 6.5
Highest latency value across all storage paths used by the host
numberReadAveraged | rate | number | 3 | 3 | average | Average read requests per second | HostSystem | instance | 5.0 5.1 5.5 6.0 6.5
Average number of read commands issued per second on the storage path during the collection interval
numberWriteAveraged | rate | number | 3 | 3 | average | Average write requests per second | HostSystem | instance | 5.0 5.1 5.5 6.0 6.5
Average number of write commands issued per second on the storage path during the collection interval
read | rate | kiloBytesPerSecond | 3 | 3 | average | Read rate | HostSystem | instance | 5.0 5.1 5.5 6.0 6.5
Rate of reading data on the storage path
throughput.cont | absolute | millisecond | 4 | 4 | average | Storage Path Throughput Contention |  |  |
Average amount of time for an I/O operation to complete successfully
throughput.usage | rate | kiloBytesPerSecond | 4 | 4 | average | Storage Path Throughput Usage |  |  |
Storage path I/O rate.
totalReadLatency | absolute | millisecond | 3 | 3 | average | Read latency | HostSystem | instance | 5.0 5.1 5.5 6.0 6.5
The average time a read issued on the storage path takes
totalWriteLatency | absolute | millisecond | 3 | 3 | average | Write latency | HostSystem | instance | 5.0 5.1 5.5 6.0 6.5
Average amount of time for a write issued on the storage path. Total latency = kernel latency + device latency.
write | rate | kiloBytesPerSecond | 3 | 3 | average | Write rate | HostSystem | instance | 5.0 5.1 5.5 6.0 6.5
Rate of writing data on the storage path

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