byp4a55 professor6T9

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File Name : README.sg_start

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

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

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-05-21 01:42:08
..	dir	-	root/root	0755	2025-11-18 01:43:27
AUTHORS	file	114 B	root/root	0644	2007-07-14 12:42:29
BSD_LICENSE	file	1.33 KB	root/root	0644	2019-01-11 06:11:25
COPYING	file	1.43 KB	root/root	0644	2021-10-28 11:35:11
COVERAGE	file	8.15 KB	root/root	0644	2021-08-30 09:15:57
CREDITS	file	5.93 KB	root/root	0644	2021-10-28 11:35:11
ChangeLog	file	87.17 KB	root/root	0644	2021-11-10 08:37:23
README	file	28.5 KB	root/root	0644	2021-06-23 06:09:48
README.sg_start	file	1.17 KB	root/root	0644	2021-10-28 11:35:11

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