linux-kernel - Re: raid1 with nbd member hangs MD on SLES10 and RHEL5

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Message-ID: <4671E4BC.9080806@steeleye.com>
Date:	Thu, 14 Jun 2007 21:00:44 -0400
From:	Paul Clements <paul.clements@...eleye.com>
To:	Mike Snitzer <snitzer@...il.com>
CC:	Neil Brown <neilb@...e.de>, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org, nbd-general@...ts.sourceforge.net,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: raid1 with nbd member hangs MD on SLES10 and RHEL5

Mike Snitzer wrote:

> Just a quick update; it is really starting to look like there is
> definitely an issue with the nbd kernel driver.  I booted the SLES10
> 2.6.16.46-0.12-smp kernel with maxcpus=1 to test the theory that the
> nbd SMP fix that went into 2.6.16 was in some way causing this MD/NBD
> hang.  But it _still_ occurs with the 4-step process I outlined above.
> 
> The nbd0 device _should_ feel an NBD_DISCONNECT because the nbd-server
> is no longer running (the node it was running on was powered off)...

What do you mean, nbd should _feel_ an NBD_DISCONNECT ?

NBD_DISCONNECT is a manual process, not an automatic one.

--
Paul
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