Back to PerformanceManager

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 deltanumber24summation Virtual Disk Number of Resets
Number of SCSI-bus reset commands issued during the collection interval.
commandsAborted deltanumber24summation Virtual Disk Number of Terminations
Number of SCSI commands aborted during the collection interval.
largeSeeks absolutenumber44latest Number of large seeks VirtualMachineinstance5.1
5.5
6.0
6.5
Number of seeks during the interval that were greater than 8192 LBNs apart
mediumSeeks absolutenumber44latest Number of medium seeks VirtualMachineinstance5.1
5.5
6.0
6.5
Number of seeks during the interval that were between 64 and 8192 LBNs apart
numberReadAveraged ratenumber13average Average read requests per second VirtualMachineinstance5.0
5.1
5.5
6.0
6.5
Average number of read commands issued per second to the virtual disk during the collection interval
numberWriteAveraged ratenumber13average Average write requests per second VirtualMachineinstance5.0
5.1
5.5
6.0
6.5
Average number of write commands issued per second to the virtual disk during the collection interval
read ratekiloBytesPerSecond22average Read rate VirtualMachineinstance5.0
5.1
5.5
6.0
6.5
Rate of reading data from the virtual disk
readIOSize absolutenumber44latest Read request size VirtualMachineinstance5.1
5.5
6.0
6.5
Average read request size in bytes
readLatencyUS absolutemicrosecond44latest Read Latency (us) VirtualMachineinstance5.1
5.5
6.0
6.5
Read latency in microseconds
readLoadMetric absolutenumber22latest Read workload metric VirtualMachineinstance5.0
5.1
5.5
6.0
6.5
Storage DRS virtual disk metric for the read workload model
readOIO absolutenumber22latest Average number of outstanding read requests VirtualMachineinstance5.0
5.1
5.5
6.0
6.5
Average number of outstanding read requests to the virtual disk during the collection interval
smallSeeks absolutenumber44latest Number of small seeks VirtualMachineinstance5.1
5.5
6.0
6.5
Number of seeks during the interval that were less than 64 LBNs apart
throughput.cont absolutemillisecond44average Virtual Disk Throughput Contention
Average amount of time for an I/O operation to complete successfully
throughput.usage ratekiloBytesPerSecond44average Virtual Disk Throughput Usage
Virtual disk I/O rate.
totalReadLatency absolutemillisecond13average Read latency VirtualMachineinstance5.0
5.1
5.5
6.0
6.5
Average amount of time for a read operation from the virtual disk. Total latency = kernel latency + device latency.
totalWriteLatency absolutemillisecond13average Write latency VirtualMachineinstance5.0
5.1
5.5
6.0
6.5
The average time a write to the virtual disk takes
vFlashCacheIops absolutenumber44latest 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 absolutemicrosecond44latest Virtual Flash Read Cache latency for the virtual disk
The average virtual Flash Read Cache latency value for the virtual disk
vFlashCacheThroughput absolutenumber44latest Virtual Flash Read Cache throughput for virtual disk
The average virtual Flash Read Cache throughput value for the virtual disk
write ratekiloBytesPerSecond22average Write rate VirtualMachineinstance5.0
5.1
5.5
6.0
6.5
Rate of writing data to the virtual disk
writeIOSize absolutenumber44latest Write request size VirtualMachineinstance5.1
5.5
6.0
6.5
Average write request size in bytes
writeLatencyUS absolutemicrosecond44latest Write Latency (us) VirtualMachineinstance5.1
5.5
6.0
6.5
Write latency in microseconds
writeLoadMetric absolutenumber22latest Write workload metric VirtualMachineinstance5.0
5.1
5.5
6.0
6.5
Storage DRS virtual disk metric for the write workload model.
writeOIO absolutenumber22latest Average number of outstanding write requests VirtualMachineinstance5.0
5.1
5.5
6.0
6.5
Average number of outstanding write requests to the virtual disk during the collection interval.

 

Back to Top of page
Back to PerformanceManager