Which latency type is described as the average time spent in Kernel queue per SCSI command?

The average time spent in the Kernel queue per SCSI command is best described as command queue latency. This latency type highlights the duration that commands are waiting in the system's kernel before they are processed. In a storage environment, when SCSI commands are issued, they may not be executed immediately due to system resource constraints, prioritization, or other factors causing delays. Command queue latency specifically measures this waiting time in the kernel queue, distinguishing it from other latency types that pertain directly to read or write operations or the specifics of commands that were not completed successfully.

Understanding command queue latency is crucial for diagnosing performance bottlenecks in storage systems, as it directly correlates with how efficiently SCSI commands are being handled. This can help in optimizing storage performance and ensuring that system resources are being utilized effectively to minimize delays for tasks that rely on the completion of those commands.