From: David Brown <david@westcontrol.com>
To: linux-raid@vger.kernel.org
Subject: Re: Best way to create RAID-6 for swap partition - existing one failed
Date: Wed, 18 May 2011 17:01:53 +0200 [thread overview]
Message-ID: <ir0n05$s95$1@dough.gmane.org> (raw)
In-Reply-To: <595104.28955.qm@web65106.mail.ac2.yahoo.com>
On 16/05/2011 23:41, Gavin Flower wrote:
> Hi,
>
> Motivation, existing RAID-6 swap partition failed. I am thinking I
> should recreate it in a new format, as currently it is 'Version :
> 0.90', rather than simply rebuild it.
>
> So 3 questions:
>
> (1) What further diagnostics should I run first, if any (note I am
> currently running badblocks on the drive that dropped out), and I
> have put the existing diagnostic info at the end of this email
>
>
> (2) What is the most appropriate RAID-6 format for a swap partition,
> keeping same the number of drives and overall capacity.
>
> (3) How to convert the existing /dev/md0 to the new format.
>
>
RAID-6 is a lot of overhead for a 5-drive array. Unless you have plans
to add more drives or resize it, you are going to get a lot faster
performance with a raid-10,far layout at little extra space cost.
RAID-6 is particularly slow for small writes, as the whole stripe needs
to be read in for an update - I think that would hit swap usage pretty hard.
next prev parent reply other threads:[~2011-05-18 15:01 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-16 21:41 Best way to create RAID-6 for swap partition - existing one failed Gavin Flower
2011-05-18 15:01 ` David Brown [this message]
2011-05-18 18:59 ` Stan Hoeppner
2011-05-18 19:57 ` likewhoa
2011-05-18 20:32 ` Gavin Flower
2011-05-18 20:59 ` likewhoa
2011-05-18 20:13 ` Gavin Flower
2011-05-18 21:53 ` Stan Hoeppner
2011-05-18 22:31 ` Gavin Flower
2011-05-18 23:01 ` Stan Hoeppner
2011-05-18 20:42 ` Gavin Flower
2011-05-18 22:26 ` Stan Hoeppner
2011-05-18 22:55 ` Gavin Flower
2011-05-19 0:11 ` Gavin Flower
2011-05-19 2:26 ` Stan Hoeppner
2011-05-19 2:50 ` Gavin Flower
2011-05-19 3:28 ` Stan Hoeppner
2011-05-19 4:05 ` Gavin Flower
2011-05-19 8:17 ` Stan Hoeppner
2011-05-20 3:32 ` Leslie Rhorer
2011-05-19 9:04 ` Gordon Henderson
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