linux-kernel - RE: [linux-pm] Power management for SCSI

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Message-ID: <Pine.LNX.4.44L0.0808131636400.2144-100000@iolanthe.rowland.org>
Date:	Wed, 13 Aug 2008 16:38:39 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Leisner, Martin" <Martin.Leisner@...ox.com>
cc:	Oliver Neukum <oneukum@...e.de>,
	Linux-pm mailing list <linux-pm@...ts.osdl.org>,
	kernel list <linux-kernel@...r.kernel.org>, <teheo@...ell.com>,
	<James.Bottomley@...senpartnership.com>,
	Pavel Machek <pavel@...e.cz>,
	Stefan Richter <stefanr@...6.in-berlin.de>
Subject: RE: [linux-pm] Power management for SCSI

On Wed, 13 Aug 2008, Leisner, Martin wrote:

> Regarding these scsi suspend patches, there's a general
> problem to drop power on disk devices on a running system.
> I discussed it in:
> 
> http://www.gossamer-threads.com/lists/linux/kernel/811598

There's a much worse problem which that thread completely ignored:

When you turn off power to a disk device, to the system it looks like a 
hot-unplug event.  Any mounted filesystems or memory mappings on that 
disk will be lost.

Alan Stern

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