svn commit: r214279 - in head: share/man/man4 sys/cam
bruce at cran.org.uk
Sun Oct 24 16:35:36 UTC 2010
On Sunday 24 October 2010 17:31:58 Bruce Cran wrote:
> 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.
The FLUSH CACHE + STANDBY IMMEDIATE commands are issued (instead of just
SLEEP) following the procedure documented in Fujitsu's MHW series product
documentation under section 1.10.1, "Recommended power-off sequence".
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