This counter tracks SCSI Request Sense commands sent on this LUN/flow, which a host issues specifically to retrieve detailed error/status information after a prior command returned a check-condition status. Because Request Sense is a direct consequence of some other command having reported an error, a rising count here is a strong proxy for an elevated error rate on this specific flow, correlating with the various SCSI SENSE key error counters (like ciscoScsiFlowSenseKeyNotRdyErrs) elsewhere in this table. A flow showing hundreds of Request Sense commands alongside a corresponding jump in one specific SENSE key error counter tells the admin exactly what kind of error is driving that activity.