Re: [PATCH] sd: implement stop_on_shutdown

["Darrick J. Wong" <djwong@us.ibm.com>]

Tejun Heo wrote:
> sd doesn't stop (unload head) on shutdown.  This behavior is necessary
> for multi initiator cases.  Unloading head by powering off stresses
> the drive and sometimes produces distinct clunking noise which
> apparently disturbs users considering multiple reports on different
> distributions.  halt(8) usually puts the drives to sleep prior to
> shutdown but the implementation is fragile and it doesn't work with
> sleep-to-disk.

I wonder if this sort of thing (cache flush + spin down) is the sort of
thing that ought to be done to near-line storage at suspend time too,
though one would want allow_restart = 1 before doing such a thing.

--D