Tracing mountd requests
To trace mountd requests, you can add a *.debug entry to the /etc/syslog.conf file and set the nfs.mountd.trace option to on.
Use of hard mounts
When troubleshooting mounting problems, you need to be sure that you are using the correct mount type. NFS supports two mount types: soft mounts and hard mounts. You should use only hard mounts for reliability reasons.