This message appears on an NFS client that requested a service from an NFS server that has failing hardware. Often the message NFS read failed appears along with this message. If the server were merely down or slow to respond, the NFS server not responding message would appear instead. Data corruption on the server system is possible.
Because this message usually indicates server hardware failure, initiate repair procedures as soon as possible. Check the memory modules, disk controllers, and CPU board.
For more information on NFS tuning, see the chapter on monitoring network performance in the System Administration Guide, Volume 2.