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NFS Mount options for Oracle Datafiles

#mount -F nfs -o rw,bg,hard,nointr,rsize=32768, wsize=32768, noac,forcedirectio, vers=3,suid storage1:/vol/vol1/oracle /backup_oracle

bg | fg
If the first attempt fails, retry in the background, or, in the foreground. The default is fg.

rsize=n
 Set the read buffer size to n bytes. The default value is 32768 when using Version 3 of the NFS protocol. The default can be negotiated down if the server prefers a smaller transfer size. When using Version 2, the default value is 8192.

wsize=n
Set the write buffer size to n bytes. The default value is 32768 when using Version 3 of the NFS protocol. The default can be negotiated down if the server prefers a smaller transfer size. When using Version 2, the default value is 8192.

noac
Suppress data and attribute caching. The data caching that is suppressed is the write-behind. The local page cache is still maintained, but data copied into it is immediately written to the server.
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