[cam][patch] SCSI disk spin-down on shutdown

[Thomas Eberhardt]

Hi,

Appended is a patch to optionally spin-down SCSI disks on shutdown (i didn’t like the increasing
Power-Off retract events in the SMART-stats of my disks). The patch is based on r203420 and
the current stable/9 ata_da.c code.

My server is running stable/9 and has a bunch of SATA-disks behind three IBM M1015 controllers
(using IT-firmware) and has been running free of trouble for over a year with this patch.

Hopefully i didn’t do any stupid things in the code since i’m not really a kernel hacker. :-)

Regards,

Thomas

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