| 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 |
