Re: Questions about RAID 6
On Mon April 26 2010 12:29:43 Stan Hoeppner wrote:
> Mark Allums put forth on 4/26/2010 12:51 PM:
> > Put four drives in a RAID 1, you can suffer a loss of three drives.
>
> And you'll suffer pretty abysmal write performance as well.
Write performance of RAID-1 is approximately as good as a simple drive,
which is good enough for many applications.
> Also keep in mind that some software RAID implementations allow more than
> two drives in RAID 1, most often called a "mirror set". However, I don't
> know of any hardware RAID controllers that allow more than 2 drives in a
> RAID 1. RAID 10 yields excellent fault tolerance and a substantial boost
> to read and write performance. Anyone considering a 4 disk mirror set
> should do RAID 10 instead.
Some of my RAIDs are N-way RAID-1 because of the superior read performance.
--Mike Bird
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