From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pavel Hofman <pavel.hofman@ivitera.com>
Subject: Re: Rotating RAID 1
Date: Tue, 16 Aug 2011 08:34:46 +0200
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To: NeilBrown <neilb@suse.de>
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Dne 16.8.2011 01:55, NeilBrown napsal(a):
> 
>  Also, it doesn't have to be a linear stack.  It could be a binary tree
>  though that might take a little more care to construct.

Since our backup server being a critical resource needs redundancy
itself, we are running two degraded RAID1s in parallel, using two
internal drives. The two alternating external drives plug into the
corresponding bitmap-enabled RAID1.

Pavel.