ZFS - the last word in file systems.

"ZFS is supported on both SPARC and x86 platforms. More important, ZFS is endian-neutral. You can easily move disks from a SPARC server to an x86 server. Neither architecture pays a byte-swapping tax due to Sun's patent-pending "adaptive endian-ness" technology, which is unique to ZFS. And you don't have to worry about migration. Sun continues to support the UFS file system."
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 (Submitted by Noel Wed Sep 15, 2004 )