linux-kernel - Re: [linux-pm] Re: A unresponsive file system can hang all I/O in the system on linux-2.6.23-rc6 (dirty

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Message-ID: <Pine.LNX.4.44L0.0709281244250.4336-100000@iolanthe.rowland.org>
Date:	Fri, 28 Sep 2007 12:45:41 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	Jonathan Corbet <corbet@....net>, Chakri n <chakriin5@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	<nfs@...ts.sourceforge.net>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] Re: A unresponsive file system can hang all I/O in
 the system on linux-2.6.23-rc6 (dirty_thresh problem?)

On Fri, 28 Sep 2007, Peter Zijlstra wrote:

> On Fri, 2007-09-28 at 07:28 -0600, Jonathan Corbet wrote:

> > Is it really NFS-related?  I was trying to back up my 2.6.23-rc8 system
> > to an external USB drive the other day when something flaked and the
> > drive fell off the bus.  That, too, was sufficient to wedge the entire
> > system, even though the only thing which needed the dead drive was one
> > rsync process.  It's kind of a bummer to have to hit the reset button
> > after the failure of (what should be) a non-critical piece of hardware.
> > 
> > Not that I have a fix to propose...:)
> 
> the per bdi work in -mm should make the system not drop dead.
> 
> Still, would a remove,re-insert of the usb media end up with the same
> bdi? That is, would it recognise as the same and resume the transfer.

Removal and replacement of the media might work.  I have never tried 
it.

But Jon described removal of the device, not the media.  Replacing the 
device definitely will not work.

Alan Stern

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