RMAN backup to DataDomain

I want to run an RMAN backup to a NFS-share on DataDomain from AIX but I got this error message

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ch1 channel at 10/28/2009 14:56:28
ORA-01580: error creating control backup file /dd510/lkpdi194/NISWWP/rman/autobackup/snap_ctrlfile_NISWWP.ctrl
ORA-27054: NFS file system where the file is created or resides is not mounted with correct options
Additional information: 6

This is the result from nfsstat -m

bash-3.00# nfsstat -m
/dd510 from /dd510:10.1.112.25
Flags: vers=3,proto=tcp,auth=unix,hard,nointr,dynamic,link,symlink,rsize=32768,wsize=32768,retrans=5
All: srtt=0 (0ms), dev=24000 (120000ms), cur=6000 (120000ms)

Are there anyone have an idea whats wrong