Xsan

Xsan: Backup

OK, RAID 5 is not a backup scheme.  Even with Direct Attached Storage you have to back it up.  But even more to the point, if you have a bunch of RAIDs strung together as an Xsan and you’re not backing it up then you are taking life one day at a time.  Stop.  The cost of a backup is probably nothing compared to the cost of loosing all your data.