linux:ora-27054:nfs file system error

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RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ORA_DISK_1 channel at 07/31/2007 09:55:18
ORA-19504: failed to create file "/bak/bak_629373314_15_1"
ORA-27054: NFS file system where the file is created or resides is not mounted with correct options
Additional information: 3
正確的選項為: -o rw,bg,hard,intr,proto=tcp,vers=3,rsize=32768,wsize=32768,timeo=600