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High CIFS latency on FlexGroup constituents from heavy RENAME workload

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Category:
ontap-9
Specialty:
perf
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Applies to

  • ONTAP
  • FlexGroup
  • CIFS

Issue

 

Users may experience high latency in FlexGroup volumes, manifesting as:

  • Elevated CPU D-blade latency.
  • High CIFS or NFS latency affecting multiple constituents across nodes.
  • Hung NFS RPC calls or stalled application processes dependent on file system operations.


Example latency output from a cluster:
cluster01::*> system node run -node node-01 -command "wafltop show -v latency -i 10 -n 10"
Latency
                            Application            Latency ms
                            -----------            ----------
    aggr01:VOLUME_FLEXGROUP__0010:cifs:           885.569
    aggr01:VOLUME_FLEXGROUP__0008:cifs:            58.957
    aggr01:VOLUME_FLEXGROUP__0009:cifs:            53.140
    aggr01:VOLUME_FLEXGROUP__0004:cifs:            52.011
    aggr01:VOLUME_FLEXGROUP__0006:cifs:            38.911
    aggr01:VOLUME_FLEXGROUP__0011:cifs:            37.636
    aggr01:VOLUME_FLEXGROUP__0001:cifs:            34.990

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