NFS Services Administrator's Guide

Troubleshooting NFS Services
Performance Tuning
Chapter 5 187
When a client requests access to a linked file or directory, two
requests are sent to the server: one to look up the path to the link,
and another to look up the target of the link. You can improve NFS
performance by removing symbolic links from exported directories.
❏ If the value of getattr displayed by nfsstat -s is greater than
60%, one or more clients have either turned off attribute caching
(with the noac mount option) or set the caching timeout values too
low.
Increase the attribute caching timeouts on the clients that have them
set below the default values. See “Changing the Default Mount
Options” on page 51.
❏ Share directories with the async option. When async is specified, the
server acknowledges write requests from clients before writing data
to a disk. Clients do not have to wait for a write request to complete
before issuing another request.This can be performed only for
NFSv2. The default option for NFSv3 is async.