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Hi,
you can use sg_start to start (spin-up, 1) and stop (spin-down, 0) devices.
I also offers a parameter (-s) to send a synchronize cache command to a
device, so it should write back its internal buffers to the medium.
Be aware that the Linux SCSI subsystem at this time does not automatically
starts stopped devices, so stopping a device which is in use may have fatal
results for you.
So, you should apply with care.
I use it in my shutdown script at the end (before the poweroff command):
# SG_SHUG_NOS is set in my config file rc.config
# SG_SHUT_NOS="0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15"
if test -x /bin/sg_start; then
if test "`basename $command`" = "reboot"; then
for no in $SG_SHUT_NOS;
do /bin/sg_start /dev/sg$no -s >/dev/null 2>&1;
done
else
for no in $SG_SHUT_NOS;
do /bin/sg_start /dev/sg$no -s 0 >/dev/null 2>&1;
done
fi
fi
Enjoy!
Kurt Garloff <garloff at suse dot de>
Postscript
==========
sg_start has been reworked to allow a block device (e.g. /dev/sda) in
addition to the sg device name (e.g. /dev/sg0) in the lk 2.6 series.
sg_start now has more command line options, see its man page.
Douglas Gilbert <dgilbert at interlog dot com> 2004/5/8