Re: [PATCH RFC] sd: spin down disks on removal or power-down

[James Bottomley]

On Mon, 2007-01-29 at 15:47 -0800, Andrew Morton wrote:
> What we don't want to happen is for those disks to spin down during a
> reboot.
> It seems that this is OK with this patch.
> 
> Also, we probably don't want them to be spun down during a kexec_load,
> but
> I expect that's OK too.

Actually, there's another case where we don't want to do spin down, and
that's when we don't own the disc (think external array on a SAN).
Telling this has always been the biggest stumbling block to spin down of
SCSI devices.

There's a patch similar to yours which takes this into account, which is
currently under discussion:

http://marc.theaimsgroup.com/?t=116922621200002

James


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