RE: [linux-pm] Power management for SCSI

[Alan Stern]

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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