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From: David Greaves <david@dgreaves.com>
To: 'Jon Collette' <jon@etelos.com>
Cc: Guy Watkins <linux-raid@watkins-home.com>, linux-raid@vger.kernel.org
Subject: Re: mdadm create to existing raid5
Date: Fri, 13 Jul 2007 11:32:16 +0100	[thread overview]
Message-ID: <469754B0.4020104@dgreaves.com> (raw)
In-Reply-To: <469736E2.7040802@dgreaves.com>

David Greaves wrote:
> For a simple 4 device array I there are 24 permutations - doable by 
> hand, if you have 5 devices then it's 120, 6 is 720 - getting tricky ;)

Oh, wait, for 4 devices there are 24 permutations - and you need to do it 4 
times, substituting 'missing' for each device - so 96 trials.

4320 trials for a 6 device array.

Hmm. I've got a 7 device raid 6 - I think I'll go an make a note of how it's put 
together... <grin>


Have a look at this section and the linked script.
I can't test it until later

http://linux-raid.osdl.org/index.php/RAID_Recovery

http://linux-raid.osdl.org/index.php/Permute_array.pl


David



  reply	other threads:[~2007-07-13 10:32 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-07-12 21:28 mdadm create to existing raid5 Jon Collette
2007-07-12 23:18 ` Guy Watkins
2007-07-13  8:25   ` David Greaves
2007-07-13 10:32     ` David Greaves [this message]
2007-07-13 18:25       ` Jon Collette

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