Re: What is the point of RAID?
On Sat November 8 2008 00:43:10 lee wrote:
> On Fri, 7 Nov 2008 23:29:55 -0500
>
> "Douglas A. Tutty" <dtutty@vianet.ca> wrote:
> > On Fri, Nov 07, 2008 at 10:20:51PM -0600, Mark Allums wrote:
> >
> > If you do only have three drives, add it to the raid1 array.
>
> Hm, if you do that, is there any other use for the third disk than as a
> spare?
RAID is a tool. You look at your system requirements and often
RAID will help your meet them. But requirements differ and RAID
applications differ.
Earlier Henrique pooh-poohed the idea of not swapping over RAID,
but there are of course situations where performance trumps risk.
As for three-disk RAID 1, it's useful where disk reads are the
bottleneck and disk write volume (including atime updates) is low.
--Mike Bird
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