In dealing with disk arrays that hold 60+ TB for commercial use, backup to disk is also popular. The product I'm most familiar with is a device that emulates a tape drive interface (so backup software is comfortable) but uses a RAID array as the storage (with bigger, cheaper, slower, disks than the primary on-line array its backing up). It also then has a transparent way to copy the disk-based tapes to real tapes for offline backup.
Mirroring to another site -- either synchronously or asynchronously -- (like many here do) is also very popular. It's just on a much bigger scale.
For R5 vs. R1, R5 is cheaper and the real reliability is only slightly worse than mirrors (gets worse with wider Raid groups, but also gets cheaper). R1 needs back-ups just as much as R5 does.
On 3/23/06, BillC <[EMAIL PROTECTED]> wrote:
kkitts Wrote:
> The age-old question for me is how one realy backs up disk arrays this
> large.
Yep. I was going to ask about that very thing. What, if anything, are
people using to back up a large music library. I have my ripped files
on a RAID5 NAS. Backing up to DVD would be a daunting task. The only
real solution seems to be occasionally taking a snapshot onto another
drive - which calls into question the whole idea of RAID 5 versus RAID
1 in the first place.
--
BillC
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