| .TH SG_START "8" "May 2003" "sg3_utils-1.04" SG3_UTILS |
| .SH NAME |
| sg_start \- starts (spins-up) or stops (spins down) SCSI devices |
| .SH SYNOPSIS |
| .B sg_start |
| [\fI-d\fR] [\fI-imm=0|1\fR] [\fI-loej\fR] [\fI-pc=<n>\fR] |
| [\fI-s\fR] [\fI-V\fR] [\fI0|1\fR] \fI<sg_device>\fR |
| .SH DESCRIPTION |
| .\" Add any additional description here |
| .PP |
| sg_start sends a START STOP UNIT SCSI command to the given device with |
| the selected options. The most used options are "0" to spin down a disk |
| and "1" to spin up a disk. Using "sg_start 1 /dev/sg0" on a disk that |
| is already spinning is harmless. |
| .TP |
| -d |
| outputs some extra debug information associated with executing this command |
| .TP |
| -imm=0|1 |
| when the immediate bit is 1 (default) then this command (and hence this |
| utility) return immediately after the device has received the command. |
| When this switch is 0 then the command returns when the action it |
| requests has been completed. |
| .TP |
| -loej |
| load the media when the unit is started or eject it when the unit is |
| stopped. This option is ignored if 'pc > 0'. Default is off (i.e. don't |
| attempt to load or eject media). Obviously only makes sense with |
| removable media. |
| .TP |
| -pc=<n> |
| set the 'power conditions' value (in hex); 0 to f (inclusive) are valid. |
| When '-pc=0' then the start value (i.e. 0 or 1) and '-loej' are active. |
| See recent SBC-2 or SAS drafts at www.t10.org for meaning. |
| .TP |
| -s |
| send the SYNCHRONIZE CACHE SCSI command to the device prior to sending the |
| START STOP UNIT command. |
| .TP |
| -V |
| print out version string then exit. |
| .TP |
| 0 |
| stop (spin-down) given device. Active when '-pc=0' or is not given. |
| .TP |
| 1 |
| start (spin-up) given device. Active when '-pc=0' or is not given. |
| .PP |
| In the 2.4 series of Linux kernels the given device must be |
| a SCSI generic (sg) device. In the 2.5 series block devices (e.g. disks |
| and SCSI DVDs) can also be specified. For example "sg_start 0 /dev/sda" |
| will work in the 2.5 series kernels. |
| .SH AUTHOR |
| Written by K. Garloff and D. Gilbert |
| .SH "REPORTING BUGS" |
| Report bugs to <dgilbert@interlog.com>. |
| .SH COPYRIGHT |
| Copyright \(co 2002-2003 Kurt Garloff, Douglas Gilbert |
| .br |
| This software is distributed under the GPL version 2. There is NO |
| warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| .SH "SEE ALSO" |
| .B sg_senddiag(sg3_utils) |
