From mboxrd@z Thu Jan  1 00:00:00 1970
From: likewhoa <likewhoa@weboperative.com>
Subject: Re: Best way to create RAID-6 for swap partition - existing one
 failed
Date: Wed, 18 May 2011 15:57:22 -0400
Message-ID: <1305748642.10481.1.camel@darkside>
References: <595104.28955.qm@web65106.mail.ac2.yahoo.com>
	 <4DD41713.5070407@hardwarefreak.com>
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To: Gavin Flower <gavinflower@yahoo.com>
Cc: linux-raid@vger.kernel.org
List-Id: linux-raid.ids

Why not just let the kernel handle the stripping for you, IMO using
dmraid is overkill for swap when it can all be handled by the kernel
itself with 'swap -p1 /dev/sda1' for example.
 
On Wed, 2011-05-18 at 13:59 -0500, Stan Hoeppner wrote:
> On 5/16/2011 4:41 PM, Gavin Flower wrote:
> 
> > 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.
> <snip>
> 
> Forget using a partition.  Simply use a swap file.  This example creates
> a 1GB swap file in the / filesystem.  You can locate it on any
> filesystem you wish.
> 
> # swappoff -a
> # dd if=/dev/zero of=/swapfile1 bs=1024 count=1048576
> # mkswap /swapfile1
> # swapon /swapfile1
> # vi /etc/fstab
> Add:
> /swapfile1 swap swap defaults 0 0
> 
> and remove your old entry for the failed swap partition.
> 
> There is little performance difference between swap files and swap
> partitions with modern kernels.  The kernel will map the disk location
> of the swap file and perform direct disk access, bypassing the
> filesystem and buffer cache.
>