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Storage Adapter 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 adapter group of performance counters supports real-time performance metrics (such as latency and read- and write-speeds) for I/O operations on storage adapters.

Counter StatsType Unit Levels Per
Device
Level
RollupTypes Labels Entity Instance/
Aggregate
ESX
Versions
OIOsPct absolutepercent44average Storage Adapter Outstanding I/Os
The percent of I/Os that have been issued but have not yet completed
commandsAveraged ratenumber22average Average commands issued per second HostSysteminstance5.0
5.1
5.5
6.0
6.5
6.7
Average number of commands issued per second by the storage adapter during the collection interval
maxTotalLatency absolutemillisecond33latest Highest latency HostSystemaggregate5.0
5.1
5.5
6.0
6.5
6.7
Highest latency value across all storage adapters used by the host
numberReadAveraged ratenumber22average Average read requests per second HostSysteminstance5.0
5.1
5.5
6.0
6.5
6.7
Average number of read commands issued per second by the storage adapter during the collection interval
numberWriteAveraged ratenumber22average Average write requests per second HostSysteminstance5.0
5.1
5.5
6.0
6.5
6.7
Average number of write commands issued per second by the storage adapter during the collection interval
outstandingIOs absolutenumber22average Storage Adapter Outstanding I/Os
The number of I/Os that have been issued but have not yet completed
queueDepth absolutenumber22average Storage Adapter Queue Depth
The maximum number of I/Os that can be outstanding at a given time
queueLatency absolutemillisecond22average Storage Adapter Queue Command Latency
Average amount of time spent in the VMkernel queue, per SCSI command, during the collection interval
queued absolutenumber22average Storage Adapter Number Queued
The current number of I/Os that are waiting to be issued
read ratekiloBytesPerSecond22average Read rate HostSysteminstance5.0
5.1
5.5
6.0
6.5
6.7
Rate of reading data by the storage adapter
throughput.cont absolutemillisecond44average Storage Adapter Throughput Contention
Average amount of time for an I/O operation to complete successfully
throughput.usag ratekiloBytesPerSecond44average Storage Adapter Throughput Usage
The storage adapter's I/O rate.
totalReadLatency absolutemillisecond22average Read latency HostSysteminstance5.0
5.1
5.5
6.0
6.5
6.7
Average amount of time for a read operation by the storage adapter. Total latency = kernel latency + device latency.
totalWriteLatency absolutemillisecond22average Write latency HostSysteminstance5.0
5.1
5.5
6.0
6.5
6.7
Average amount of time for a write operation by the storage adapter. Total latency = kernel latency + device latency.
write ratekiloBytesPerSecond22average Write rate HostSysteminstance5.0
5.1
5.5
6.0
6.5
6.7
Rate of writing data by the storage adapter

 

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