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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 autmatically
- 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.
- Doug Gilbert <dgilbert at interlog dot com> 2004/5/8
-