My experience with raid5 was a bad one. I had one drive fail on my
linux server and didn't get notified for a long time. Then when I
went to add another drive and rebuild, another (of the same vintage)
went out.
Now, I'm not 100% sure that it wasn't my fumbly fingers that did
something to corrupt the drives during reconstruction, but it was a
lesson learned.
That was with 80G drives. When I went to rebuild, I bought 2 250G
drives and have a nightly rsync to back up one to the other. Plus I
have another drive in another machine with a more infrequent backup
from the main set in case the box catches fire or something. And
another one in my brother's house that gets backed up even more
infrequently, in case the house catches fire or something.
If my main drive goes out, I'm at risk of losing up to 24 hours worth
of changes. That's ok by me.
And, if my fumbly fingers do something stupid, I don't end up wiping
out both copies.
So, my experience is that you need to consider hardware, software and
wetware failures when protecting your data.
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