What is the difference in latency of the same volume between "statistics volume show" and "qos statistics volume latency show" commands?

Applies to

Answer

• The statistics volume show command only gives the average latency for an operation.
  • And refer to KB: Why does the statistics volume show command show the total ops which do not match the read, write, and other ops? 
  • Not all other ops are in the output of this command for NAS protocol, so the average latency for an operation can not give the detailed latency for all ops of the volume.
  • The volume object in statistics can include internal operations or SnapMirror operation latency.
• The qos statistics volume latency show command displays the average latencies for volumes on Data ONTAP subsystems. 
  • It is useful and powerful to check the volume latency.
  • It only shows SAN or NAS latency, not backend operations or latency.

Additional Information