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Re: RAID5/6 writes

To: Peter Cordes <peter@xxxxxxxxx>
Subject: Re: RAID5/6 writes
From: Andi Kleen <andi@xxxxxxxxxxxxxx>
Date: Wed, 01 Oct 2008 21:36:13 +0200
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20081001175237.GJ32037@xxxxxxxxx> (Peter Cordes's message of "Wed, 01 Oct 2008 14:52:37 -0300")
References: <20081001175237.GJ32037@xxxxxxxxx>
User-agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.3 (gnu/linux)
Peter Cordes <peter@xxxxxxxxx> writes:
>
>  XFS knows (or should have been told by the admin with mkfs!) what the
> stripe geometry is: block size and stripe width.  So it could apply
> this optimization only if it would make a write cover more whole
> blocks or whole stripes.

It's a nice idea, but I don't think XFS knows the actual RAID level,
only the stripes. And for 0/1 it wouldn't be a good idea.

-Andi

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