From: Martin Drab <drab@kepler.fjfi.cvut.cz>
To: Phillip Susi <psusi@cfl.rr.com>
Cc: govind raj <agovinda04@hotmail.com>, linux-kernel@vger.kernel.org
Subject: Re: RAID 5+0 support
Date: Thu, 19 Jan 2006 21:14:28 +0100 (CET) [thread overview]
Message-ID: <Pine.LNX.4.60.0601192113030.14341@kepler.fjfi.cvut.cz> (raw)
In-Reply-To: <43CFE34F.8060309@cfl.rr.com>
On Thu, 19 Jan 2006, Phillip Susi wrote:
> Martin Drab wrote:
> > Speed is the issue here, I believe. By stripping two RAID-5 arrays you ought
> > to get the reliability of the RAID-5 but with considerably higher speed.
> > That's basically why RAID-50 exists, I think.
>
> One big raid-5 would have higher speed because it would have one more disk
> allocated to storing data rather than more parity. The raid 5+0 isn't really
> going to be any more reliable because it can withstand a single failure in
> either half, but not two failures in one half, so in the face of a double
> failure, you have a 50/50 chance of one being in each half.
Well, yes and no. See for instance:
http://en.wikipedia.org/wiki/RAID#RAID_50_.28RAID_5.2B0.29
Martin
prev parent reply other threads:[~2006-01-19 20:16 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-19 16:52 RAID 5+0 support govind raj
2006-01-19 17:12 ` Kyle Moffett
2006-01-19 17:26 ` Phillip Susi
2006-01-19 18:07 ` Lars Marowsky-Bree
2006-01-19 18:36 ` Martin Drab
2006-01-19 19:06 ` Phillip Susi
2006-01-19 20:14 ` Martin Drab [this message]
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