linux-kernel - Re: modifying degraded raid 1 then re-adding other members is bad

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Message-ID: <17626.27968.132243.825703@cse.unsw.edu.au>
Date:	Thu, 10 Aug 2006 09:18:24 +1000
From:	Neil Brown <neilb@...e.de>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
Cc:	Michael Tokarev <mjt@....msk.ru>,
	Alexandre Oliva <aoliva@...hat.com>,
	linux-raid <linux-raid@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: modifying degraded raid 1 then re-adding other members is bad

On Wednesday August 9, jengelh@...ux01.gwdg.de wrote:
> >> Why we're updating it BACKWARD in the first place?
> >
> >To avoid writing to spares when it isn't needed - some people want
> >their spare drives to go to sleep.
> 
> That sounds a little dangerous. What if it decrements below 0?

It cannot.
md  decrements the event count only on a dirty->clean transition, and
only if it had previously incremented the count on a clean->dirty
transition.  So it can never go below what it was when the array was
assembled.

NeilBrown
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