RE: [linux-pm] Power management for SCSI
From: Alan Stern
Date: Wed Aug 13 2008 - 16:38:51 EST
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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