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