NFS Services Administrator's Guide

Troubleshooting NFS Services
Performance Tuning
Chapter 8 333
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.
CAUTION Do not remove symbolic links in an NFS diskless environment. File
sharing in NFS diskless is done by means of symbolic links.
❏ 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 “To Change the Default
Mount Options” on page 46.
❏ Export directories with the async option. When async is specified,
the server acknowledges write requests from clients before writing
data to disk. Clients do not have to wait for a write request to
complete before issuing another request.