Write once on NFS file system

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http://www.unix.com – Hello Guru's We are trying to save some data for 10 -15 yrs. so we created a NFS share file system and mounted on AIX 5.3 servers, keeping in mind that we might need to replace the expired disk/bad disk every 2 yrs or 4 yrs. Now we are trying to solve. How to protect it from getting deleted or overwritten? could any one please suggest, how to make the (/xshare) file system an write once ,while owner group users of this share can read the contents (HowTos)