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

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Message-ID: <m3fyg7m40e.fsf@defiant.localdomain>
Date:	Tue, 08 Aug 2006 21:17:05 +0200
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	Neil Brown <neilb@...e.de>, 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

Michael Tokarev <mjt@....msk.ru> writes:

> Why we're updating it BACKWARD in the first place?

Another scenario: 1 disk (of 2) is removed, another is added, RAID-1
is rebuilt, then the disk added last is removed and replaced by
the disk which was removed first. Would it trigger this problem?

> Also, why, when we adding something to the array, the event counter is
> checked -- should it resync regardless?

I think it's a full start, not a hot add. For hot add contents of
the new disk should be ignored.
-- 
Krzysztof Halasa
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