svn commit: r214279 - in head: share/man/man4 sys/cam sys/cam/ata sys/kern

[Bruce Cran]

On Sunday 24 October 2010 17:31:58 Bruce Cran wrote:

> Log:
>   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".

-- 
Bruce Cran