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NetApp Knowledge Base

NFS performance: How to track down a bad UNIX or Linux host

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1,912
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Category:
data-ontap-8
Specialty:
nfs
Last Updated:

Applies to

  • Data ONTAP 8 7-Mode 
  • Data ONTAP 7 

Description

  • In NFS environments, it is possible to see sluggish performance for a single client, or subset of clients.
  • This article discusses the different methods for troubleshooting client NFS performance for 7-mode and Clustered Data ONTAP.
  • 7-mode: The command ‘nfsstat’ can be used to obtain statistics regarding NFS clients.
    • This requires per-client statistics to be enabled, which entails some performance overhead.
    • Therefore, these statistics are not as beneficial when the performance impact experienced is wide-reaching, as it could make the problem worse.
    • For a smaller number of clients, the overhead is usually insignificant.
      • To enable per-client statistics:

> options nfs.per_client_stats.enable on

  • Clustered Data ONTAP does not provide per-client NFS statistics.
  • As of ONTAP 9, the ‘statistics top’ family of commands exists to provide a list of top clients, or top files. Therefore, troubleshooting a poor performing client with Clustered Data ONTAP requires a bit of finesse.

 

 

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