Rebecca Cran fd104c151b Mostly revert r203420, and add similar functionality into ada(4) since the
existing code caused problems with some SCSI controllers.

A new sysctl kern.cam.ada.spindown_shutdown has been added that controls
whether or not to spin-down disks when shutting down.
Spinning down the disks unloads/parks the heads - this is
much better than removing power when the disk is still
spinning because otherwise an Emergency Unload occurs which may cause damage
to the actuator.

PR:	kern/140752
Submitted by:   olli
Reviewed by:	arundel
Discussed with: mav
MFC after:	2 weeks
2010-10-24 16:31:57 +00:00
..
2010-08-30 14:26:02 +00:00
2010-07-09 10:57:55 +00:00
2010-08-30 14:26:02 +00:00
2010-08-30 14:26:02 +00:00
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2009-05-26 09:19:21 +00:00
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