RAID5 is best with a hot spare volume, otherwise...what's the advantage that justifies increased write overhead?
Besides, does the file system you're backing up to require any more redundancy from a disk technology standpoint than you might expect out of the life expectancy of a single DLT tape? Consider this, if you present these individual disks as 250? 300? gig individual volumes / file system mount points to Bacula, you *can't* tell Bacula to put each "file tape" on a different mount point and/or sub-directory. I've discussed this in the past and what that would require is the concept of a "File Storage Directory Prefix", i.e: /dev/da0s1a /storage/bacula/Daily0 /dev/da1s1a /storage/bacula/Daily1 /dev/da2s1a /storage/bacula/Daily2 ~BAS
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