linux-kernel - Re: limits on raid

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Date:	17 Jun 2007 15:00:24 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Neil Brown <neilb@...e.de>
Cc:	Avi Kivity <avi@...o.co.il>, david@...g.hm,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org
Subject: Re: limits on raid

Neil Brown <neilb@...e.de> writes:
> 
> Having the filesystem duplicate data, store checksums, and be able to
> find a different copy if the first one it chose was bad is very
> sensible and cannot be done by just putting the filesystem on RAID.

Apropos checksums: since RAID5 copies/xors anyways it would
be nice to combine that with the file system. During the xor
a simple checksum could be computed in parallel and stored
in the file system.

And the copy/checksum passes will hopefully at some
point be combined.

-Andi
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