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Date: Wed, 27 Oct 2004 09:10:39 -0600
From: secmgr <security@jim-liesl.org>
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To: Marko Raiha <mjraiha@fade.pp.fi>
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cc: freebsd-stable@freebsd.org
Subject: Re: question on vinum
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Marko Raiha wrote:

>Hi,
>
>On Tue, Oct 26, 2004 at 11:33:43PM -0600, secmgr wrote:
>  
>
>>...
>>when you define the subdisk, don't use the whole drive.  Leave at least
>>64 blocks unused.
>>...
>>    
>>
>
>Would you mind to tell the reason behind this rule of leaving at least
>64 blocks unused?
>
>Regards,
>  
>
The reason is empirically derived.  When I created a 7 disk raid 5 set 
using "len 0" or all the space available, the raid set would be corrupt 
after initializing.  Every time.  When I reserved back  that extra 
space, no corruption.
(freebsd 4.10-p3)  There was a thread on this a few days ago.

jim