[CentOS] RAID5 or RAID50 for database?

[nightduke]

I prefer raid level of ibm....

For Dell you can find more info about raid level at

http://support.dell.com/support/edocs/storage/RAID/RAIDbk0.pdf

But add hot spare disks....

Nightduke


2008/5/22, Warren Young <warren at etr-usa.com>:
> Rudi Ahlers wrote:
> >
> > So, how does it perform with 6 discs for example? Say I have 3 HDD's in
> RAID-0, and another 3 in RAID-0, then RAID-1 the 2 RAID-0 stripes.
> >
>
> There's actually two kinds of RAID-10.  Some like to say RAID-01 or RAID-1+0
> or things like that to distinguish them.  It's a matter of whether it's
> mirrors over stripes or stripes over mirrors.  You're talking about mirrors
> over stripes, but I'm talking about doing it the other way around.
>
> Your way has the advantage of letting you add disks in pairs, but to get
> that you get only single-disk redundancy: if a second disk goes out, your
> array is gone, no matter which disk it is.
>
> If you do it the other way, you have to use groups of 4 (two mirrors striped
> together) but you get the advantage that with a single disk missing, you can
> lose another if it's in the other mirror.  Of course, if you lose two in the
> same mirror, you're toast.
>
> > And what would you recommend on 8 / 10 HDD's?
> >
>
> As I said, usually RAID-5 or -6 usually makes more sense with so many
> spindles.  If you're talking RAID-10 (my way) with so many disks, it starts
> getting expensive with 8, 12, etc.
>
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