When installing an Iomega NAS to do Oracle database backup over network for a client, i came across a problem when mounting the NFS file share.

ORA-27054: NFS file system where the file is created or resides is not mounted with correct options

It turns out that Oracle requires a certain set of NFS mount options to work properly. After much testing and research online, i’ve collated the below options that works well for Oracle database mounts or backup over direct NFS (no buffer, direct I/O):

Solaris
rw,bg,hard,nointr,rsize=1048576,wsize=1048576,proto=tcp,noac,forcedirectio, vers=3,suid
AIX (5L)
cio,rw,bg,hard,nointr,rsize=1048576,wsize=1048576,proto=tcp,noac,vers=3,timeo=600
HP-UX 11i v3
rw,bg,vers=3,proto=tcp,noac,forcedirectio,hard,nointr,timeo=600,rsize=1048576,
wsize=1048576,suid
Linux x86
rw,bg,hard,nointr,rsize=1048576,wsize=1048576,tcp,actimeo=0,vers=3,timeo=600
Linux x86-64
rw,bg,hard,nointr,rsize=1048576,wsize=1048576,tcp,actimeo=0,vers=3,timeo=600