I like the idea of a discussion about the advantages and disadvantages
of RAID arrangements.
Another solution to the two hard drives backing up might be to use Raid
0 (striping). This does not allow redundancy but it does let you
combine the drives so the system sees them as one drive.
I have set up an Ubuntu 8.10 server with a 250gb boot disk and 4 1tb
SATA hard drives in Raid 5 (using software Raid).
I trust Raid 5. We have a mail server that has Raid 5 and twice we have
lost one of the drives and been able to get the new drive, put it back
into the Raid and let it rebuild with no down time except the time to
put the new drive in (20 minutes).
Something else I learned about Raid 5 and 6 from my research into a
Blade server and a SAN is that the more drives you have in your Raid it
increases that bandwidth (throughput) of the data letting everything
work faster.
I don't necessarily consider the loss of the BackupPC data a
catastrophe. I could see how it could be for someone that really wants
to keep archive copies of backups. If we have a total failure of
BackupPC we would rebuild it and start backing up again. I guess the
worse scenario would be something that would not only hurt our BackupPC
server but also damage several other servers at the same time.
The question comes down to each individual and how much time can you
afford to rebuild the data. Is that downtime worth the extra money to
put in more redundancy in the drives, offsite solutions or clustered
servers.
There are so many options but they all have a positive and a negative
and I don't think any solution, no matter how much money you have, is
100% failsafe. The odds of not being able to recover may be small but
it is still there.
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