Check the NFS TCP maximum transfer size

Contributors

For NFS, you can check whether the TCP maximum transfer size for reads and writes might be causing a performance issue. If you think the size is slowing performance, you can increase it.

What you’ll need
  • You must have cluster administrator privileges to perform this task.

  • You must use advanced privilege level commands for this task.

Steps
  1. Change to the advanced privilege level:

    set -privilege advanced

  2. Check the TCP maximum transfer size:

    vserver nfs show -vserver vserver_name -instance

  3. If the TCP maximum transfer size is too small, increase the size:

    vserver nfs modify -vserver vserver_name -tcp-max-xfer-size integer

  4. Return to the administrative privilege level:

    set -privilege admin

Example

The following example changes the TCP maximum transfer size of SVM1 to 1048576:

cluster1::*> vserver nfs modify -vserver SVM1 -tcp-max-xfer-size 1048576