linux-kernel - Re: Loud "pop" coming from hard drive on reboot

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Message-Id: <200704182331.14515.bzolnier@gmail.com>
Date:	Wed, 18 Apr 2007 23:31:14 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Tejun Heo <htejun@...il.com>
Cc:	Mark Lord <liml@....ca>, Chuck Ebbert <cebbert@...hat.com>,
	emisca <emisca.ml@...il.com>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...l.org>
Subject: Re: Loud "pop" coming from hard drive on reboot


On Wednesday 18 April 2007, Tejun Heo wrote:
> Mark Lord wrote:
> > Chuck Ebbert wrote:
> >> Mark Lord wrote:
> >>> I'll patch it locally on my own machines, but what about the tens
> >>> of thousands of other Seagate notebook drive owners out there?
> >>>
> >>
> >> This is a problem with Seagate specifically, spinning back up
> >> on receipt of some command after spindown?
> > 
> > No, they just seem to be affected worse by it than some other brands.
> > The bug is that libata/SCSI now spin-down the drive before the distro's
> > scripts are done with it, so it spins down, and then gets spun up again
> > by the distro, and then spun down again by the distro.
> > 
> > And along the way, one/both of the two causes a full mechanism "park",
> > which is hard on things if abused (like this).
> > 
> > Or at least that's what I recall for it.  Tejun?
> 
> This really isn't a regression.  It's been always like that with libata.

Tejun, it is a regression over IDE subsystem
(so all PATA and some SATA also).

Dave/Chuck, this also seems like a FC7 regression
(because of the libata PATA switch).

>  libata doesn't make devices go into standby mode and shutdown(8) does
> it for libata.  The problem here is that libata does issue
> SYNCHRONIZE_CACHE on shutdown.  So, the sequence of event is...
> 
> 1. shutdown(8) issues SYNCHRONIZE_CACHE followed by STANDBY_NOW
> 2. kernel shutdown starts
> 3. libata shutdown issues SYNCHRONIZE_CACHE
> 4. power goes off
> 
> Some drives seem to spin up at step #3 even when its cache is clean and
> power goes off right after the disk finishes the command.  So, it's
> really bad when it happens - spin down, spin up followed by immediate
> power off.
> 
> SCSI part of the fix is queued in scsi-misc-2.6 tree and libata-dev part
> is acked and waiting to be merged, so the fix will be available in
> 2.6.22.  However, it's disabled by default to remain compatible with the
> current behavior and requires userland change to fully fix the problem.
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