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sg_start




SYNOPSIS

       sg_start [-d] [-imm=0|1] [-loej] [-pc=<n>] [-s] [-V] [0|1]
       <sg_device>


DESCRIPTION

       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.

       -d     outputs  some  extra  debug  information associated
              with executing this command

       -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.

       -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.

       -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 mean­
              ing.

       -s     send the SYNCHRONIZE  CACHE  SCSI  command  to  the
              device  prior  to  sending the START STOP UNIT com­
              mand.

       -V     print out version string then exit.

       0      stop (spin-down) given device. Active when  '-pc=0'
              or is not given.

       1      start  (spin-up)  given device. Active when '-pc=0'
              or is not given.

       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.
       sg_senddiag(sg3_utils)

sg3_utils-1.04               May 2003                 SG_START(8)
  

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