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How to measure the Ops and Latency reported from Volume layer

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Category:
ontap-9
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perf
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Applies to

ONTAP 9

Description

  • Volume Layer measure the rate of requests being handled by WAFL File System and the time it takes to send the responses back to the upper layers
  • Volume Layer can measure the Ops and Latency for the whole volume, as well as on a per-protocol basis
    • NFS
    • CIFS
    • FCP
    • iSCSI
    • NVMF
    • REPL (SnapMirror)
    • SYNC REPL (Sync SnapMirror)
  • Volume Layer latency does NOT equal to the QoS latency reported on the same volume. 
    • Volume Layer Ops and Latency is measured at the WAFL File System layer
    • QoS Ops and Latency is measured at the protocol layer
    • QoS Latency is usually higher than the Volume Latency as Volume Latency is a subset of the QoS Latency
      • QoS Latency = Total latency reported from qos statistics volume latency show
      • Volume Latency ~= Data + Disk delay from qos statistics volume latency show
    • QoS Ops may, or may not equal to the Volume Ops, depending on the type of front-end/protocol operations

 

 

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