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Re: [K12OSN] why RAID?


This is a public forum.  I think it's fair game to be wikified any time
you want.

Jim McQuillan
jam Ltsp org

On Fri, 3 Dec 2004, Dennis Daniels wrote:

> Does anyone mind if this little discussion gets wikified? Reading along here I
> learned a great deal. It should be captured and worked into a location that we
> can all use. Any opposition? I'll take silence as agreement ;^)
> Dennis
> Michael Wescott wrote:
> > > why is it so important to get RAID set up?  Why not just
> > > have a cron job that makes a copy of /home or any other
> > > important directories?
> >
> >
> > RAID levels 1 and 5 provide a sufficient redundancy that you
> > can lose a disk without losing data. There are, of course,
> > other tradeoffs; the redundancy comes at the price of additional
> > disks and a performance impact on writes. There is also a gain in
> > read performance.
> >
> > But disk failures aren't the only way to lose data. A RAID
> > decreases the probability that a hardware failure will cause
> > data loss, but it has no impact on users or administrators
> > deleting or overwriting a file. So having a RAID setup does
> > not eliminate the need for doing periodic backups.
> >
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