From: Sebastian Kuzminsky <seb@highlab.com>
To: linux-raid@vger.kernel.org
Subject: Re: Raid sync observations
Date: Wed, 21 Dec 2005 10:02:31 -0700 [thread overview]
Message-ID: <E1Ep7MF-0000uF-Fj@highlab.com> (raw)
In-Reply-To: <20051221114912.GY10278@strugglers.net>
Andy Smith <andy@lug.org.uk> wrote:
> On Wed, Dec 21, 2005 at 12:55:47PM +1100, Christopher Smith wrote:
> > Why would you use RAID6 and not RAID10 with four disks ?
>
> I was wondering the same thing. It's true that RAID6 is guaranteed
> to still run degraded after losing 2 devices, whereas a RAID10 on 4
> devices could only lose 1 device from each RAID1. So there is some
> small extra redundancy there.
That's the reason - better reliability. With 4-disk RAID-10, a 2-disk
failure has a 1/3 chance of causing array failure. With RAID-6, there
is no chance.
> But how does the performance for read and write compare?
Good question! I'll post some performance numbers of the RAID-6
configuration when I have it up and running.
--
Sebastian Kuzminsky
next prev parent reply other threads:[~2005-12-21 17:02 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-20 17:18 Raid sync observations Sebastian Kuzminsky
2005-12-20 18:14 ` Sebastian Kuzminsky
2005-12-20 21:27 ` Neil Brown
2005-12-20 21:33 ` Sebastian Kuzminsky
2005-12-21 1:55 ` Christopher Smith
2005-12-21 11:49 ` Andy Smith
2005-12-21 17:02 ` Sebastian Kuzminsky [this message]
2005-12-21 17:13 ` Gordon Henderson
2006-01-08 18:18 ` Bill Davidsen
-- strict thread matches above, loose matches on Subject: below --
2005-12-20 18:27 Andrew Burgess
2005-12-20 19:13 ` Sebastian Kuzminsky
2005-12-20 22:09 Jeff Breidenbach
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