Skip to main content
NetApp Knowledge Base

Sporadic high latency for NFS Other operations on FlexGroup

  1. Last updated
  2. Save as PDF
Views:
452
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
perf
Last Updated:

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.

 

Sign in to view the entire content of this KB article.

New to NetApp?

Learn more about our award-winning Support

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.