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From: Neil Brown <neilb@cse.unsw.edu.au>
To: rayn <Wilfried.Weissmann@gmx.at>
Date: Thu, 22 Feb 2001 09:26:16 +1100 (EST)
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Message-ID: <14996.16520.832011.18@notabene.cse.unsw.edu.au>
cc: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org
Subject: Re: partitions for RAID volumes?
In-Reply-To: message from rayn on Wednesday February 21
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On Wednesday February 21, Wilfried.Weissmann@gmx.at wrote:
> Hi,
> 
> Is there any chance that RAID volumes would support partitions like the
> hard-disk driver in the future? 

Yep.
See: http://www.cse.unsw.edu.au/~neilb/patches/linux/2.4.2-pre4/

You would need patches H,I,N,O,P,Q,R,  and you should consider this a
very early release, but it works for me.
It uses a second major device number for partitioned md arrays. You
can only partition the first 16 arrays (md0 - md15) and only have 15
partitions per array.  It wont work well for raid5, but for raid1
(which is what I particularly want) or raid0 it should be fine.

Using this, I can RAID1 hda and hdc together as md0 == mda and then
partition it up as mda1 (root) mda2 (swap) mda3 (other).  And if I
have too, I can boot off either drive individually with any raid
happening.

Lilo needs to be hacked a bit to do the right thing, and I have got a
major number officially allocated from lanana, but as I said, this is
a very early release.

NeilBrown
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