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Sporadic high latency for NFS Other operations on FlexGroup

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ontap-9
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perf
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Applies to

  • ONTAP 9
  • FlexGroup
  • NFSv3
  • RAL (Remote Access Layer)

Issue

  • Long delay in traversing large directories – High latency for NFSv3 LOOKUP requests and READDIR/READDIRPLUS requests. 
  • High latency could be as high as several seconds, depending on the monitoring tool and how often the latency is reported.
  • wafl.readdir.expired observed in EMS log:

Tue Jun 21 05:02:10 CST [<node_name>: wafl_exempt00: wafl.readdir.expired:error]: A READDIR file operation has expired for the directory associated with volume fg1__0084/@vserver:5edc27ba-4d55-11ea-b14d-d039ea425425 Snapshot copy ID 0 and inode 4348458.

  • Nblade.nfsLongRunningOp observed in EMS log:

Tue Jun 21 03:39:50 CST [<node_name: kernel: Nblade.nfsLongRunningOp:debug]: Detected a long running network process operation. The client IP address:port is 10.239.42.xx:912. The local IP address:port is 10.239.0.x:2049. The protocol requesting the operation is NFS3. The RPC Program Number for the operation is 100003. The RPC Procedure Number for the operation is 8. The disk process UUID is 127db8734c7211eaadfbd039ea4251d9. The Vserver identifier is 9.

 

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