From: Keld Simonsen <keld@keldix.com>
To: Neil Brown <neilb@suse.de>
Cc: Guy Watkins <linux-raid@watkins-home.com>,
'Greg Freemyer' <greg.freemyer@gmail.com>,
'Mark Knecht' <markknecht@gmail.com>,
'Linux-RAID' <linux-raid@vger.kernel.org>
Subject: Re: What RAID type and why?
Date: Sun, 7 Mar 2010 09:06:38 +0100 [thread overview]
Message-ID: <20100307080638.GA30126@light.rap.dk> (raw)
In-Reply-To: <20100307132113.7e2c95b6@notabene.brown>
On Sun, Mar 07, 2010 at 01:21:13PM +1100, Neil Brown wrote:
> On Sat, 06 Mar 2010 18:17:44 -0500
> "Guy Watkins" <linux-raid@watkins-home.com> wrote:
>
> > }
> > } At a minimum I would build a 3-disk raid 6. raid 6 does a lot of i/o
> > } which may be a problem.
> >
> > If he only needs 3 drives I would recommend RAID1. Can still loose 2 drives
> > and you don't have the RAID6 I/O overhead.
> >
>
> and as md/raid6 requires at least 4 drives, RAID1 is not just the best
> solution to survive two failures on a 3-device array, it is the only solution.
Raid10 can also do it.
raid1 is in many ways obsolete and you should rather use raid10,
which in my eyeys is just another way of doing the same conceptual thing
as raid1.
Best regards
keld
next prev parent reply other threads:[~2010-03-07 8:06 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-06 22:02 What RAID type and why? Mark Knecht
2010-03-06 22:33 ` Greg Freemyer
2010-03-06 23:05 ` Mark Knecht
2010-03-07 0:38 ` Keld Simonsen
2010-05-10 15:20 ` Matt Garman
2010-05-10 15:34 ` Mark Knecht
2010-03-06 23:17 ` Guy Watkins
2010-03-06 23:51 ` Mark Knecht
2010-03-08 20:05 ` Bill Davidsen
2010-03-06 23:56 ` Michael Evans
2010-03-07 2:21 ` Neil Brown
2010-03-07 8:06 ` Keld Simonsen [this message]
2010-03-07 8:10 ` Guy Watkins
2010-03-07 8:22 ` 'Keld Simonsen'
2010-03-07 10:09 ` Michael Evans
2010-03-07 12:52 ` Goswin von Brederlow
2010-03-07 20:40 ` Michael Evans
2010-03-10 17:47 ` Goswin von Brederlow
2010-03-11 10:44 ` Michael Evans
2010-03-06 23:03 ` Asdo
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