To answer original post, simple answer: Almost all old RAID designs have holes in their logic where they are insufficiently paranoid on the writes or read, and sometimes both. One example is the infamous RAID-5 write hole.
Look at simple example of mirrored SVM versus ZFS in page 15&16 of this presentation: http://opensolaris.org/os/community/zfs/docs/zfs_last.pdf Critical metadata is triple duped, and all metadata is at least double-duped on even a single disk configuration. Almost all other filesystems are kludges with insufficient paranoia by default, and only become sufficiently paranoid by twiddling knobs & adding things like EMC did. After using ZFS for a while there is no other filesystem as good. I haven't played with Linux BTRFS though maybe it has some good stuff but last I heard was still in alpha. -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
