The mount command (mount.nfs4 and mount.nfs) allows you to fine tune NFS mounting to improve NFS server and client performance. However, there is no one-size-fits-all approach to NFS performance tuning. Servers can be configured for handling different workloads and may need to be tuned as per your setup. Please test and monitor both your server and client systems as you test different tuning options.

Recommended NFS Tuning Options For the Mount Command

noacl: Disables Access Control List (ACL) processing.

nocto: Suppress the retrieval of new attributes when creating a file.

rsize: The number of bytes NFS uses when reading files from an NFS server. The rsize is negotiated between the server and client to determine the largest block size that both can support. The value specified by this option is the maximum size that could be used; however, the actual size used may be smaller. Note: Setting this size to a value less than the largest supported block size will adversely affect performance.

wsize: The number of bytes NFS uses when writing files to an NFS server. The wsize is negotiated between the server and client to determine the largest block size that both can support. The value specified by this option is the maximum size that could be used; however, the actual size used may be smaller. Note: Setting this size to a value less than the largest supported block size will adversely affect performance.

noatime: Setting this value disables the NFS server from updating the inodes access time. As most applications do not necessarily need this value, you can safely disable this updating.

nodiratime: Setting this value disables the NFS server from updating the directory access time. This is the directory equivalent setting of noatime.

noac: Disable all forms of attribute caching entirely. This extracts a significant performance penalty but it allows two different NFS clients to get reasonable results when both clients are actively writing to a common export on the server.

Here is sample mount command with the above options:
# mount.nfs -o noacl,nocto, rsize=32768,wsize=32768 nfsserver:/test  /< mount point >

Posted in: Linux.
Last Modified: October 12, 2013

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