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Slowness reported for volumes with QOS min configured

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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

ONTAP 9

Issue

  • Customer reports "NFS not responding" errors on clients for all volumes where QOS_Min is configured.
  • Breakdown of latency is seen from Delay Centre : NBlade/Network processing.

qos statistics volume latency show

  • High number of NFS Rewinds and Giveups were seen which was driven out of QOS
  • Rewind is a mechanism used in Nblade to delay and retry an operation. After retry for a specific number or time, the operations "Giveup".

::*> statistics start -object rw_ctx -counter nfs_rewinds|nfs_giveups|qos_rewinds|qos_giveups|total_rewinds -sample-id <sample-name>

::*> statistics show -sample-id <sample-name>

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