On Sun, Dec 16, 2007 at 11:01:33AM -0500, Scott wrote:
> On Sun, Dec 16, 2007 at 03:45:32PM +0000, ibnerazi wrote:
>
> As we're talking practice, rather than theory, I'd say in your
> situation, RAID-1 is the best bet. It should be faster, plus, the fact
> that you have the third drive means less downtime. (For RAID-5, you'd
> have to use the 3rd disk.)
I'm going to add one more rather oddball argument for RAID-1.
We have an FTP server, and we want to upgrade it. We had thought it was
running RAID-1 and figured we'd do this. Take out one disk, replace it
with a blank and let it rebuild. Then, we'd take the disk we removed,
put it in another machine and upgrade that machine, leaving /var intact,
as it has all the user data.
However, when we looked at the machine we saw it was running RAID-5
which makes such a plan a lot more difficult. So, RAID-1 would allow
you, assuming you had identical or even very similar hardware, to do an
upgrade with less risk of data loss. I don't know if I'd recommend our
original plan :) but it seemed feasible, at least in theory. Of course,
as we know, in theory, theory and practice are the same, but in
practice, theory and practice are often different.
However, even without the above rather oddball scenario, I still think
RAID-1 is your best bet as it gives you redundancy with hardware you
already have. (And gives you better speed as well.)
--
Scott Robbins
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