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Diffstat (limited to 'README.sg_start')
-rw-r--r-- | README.sg_start | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/README.sg_start b/README.sg_start new file mode 100644 index 00000000..22034d4b --- /dev/null +++ b/README.sg_start @@ -0,0 +1,38 @@ +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 |