[2248] in linux-scsi channel archive
Re: How to turn power off on an idle scsi drive.
daemon@ATHENA.MIT.EDU (Philippe Strauss)
Mon Aug 4 21:11:06 1997
Date: Tue, 5 Aug 1997 00:15:25 +0200
From: Philippe Strauss <philou@lili.urbanet.ch>
To: Robert Johannes <rjohanne@piper.hamline.edu>
Cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <Pine.SOL.3.96.970804134659.4006B-100000@mutt>; from Robert Johannes on Mon, Aug 04, 1997 at 01:51:28PM -0500
On %M %N, Robert Johannes wrote
> Hello,
> I've a bt-948 card, and quantum fireball st and ibm ultra scsi harddrives;
> A lot of the time when I'm using the fireball, the ibm drive is idle;
> that's, I've no use for it. It consumes power though, and contributes
> unnecessary heat. How do I turn power off to a scsi drive if it is not in
> use? Is there a special command for that in linux or even win95? Would
> that affect the termination of the operating scsi drive? If any body
> knows how to turn power off on an idle scsi drive, please help me.
>
> Regards.
>
> robert Johannes
Here it is.
Be sure to unmount all partition of that disk before spinning it down :)
/* start/stop SCSI unit
* derived from scsiinfo by:
*
* Eric Youngdale - 11/1/93. Version 1.0.
*
* Version 1.1: Ability to change parameters on cache page, support for
* X front end.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <getopt.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/hdreg.h>
FILE *infile;
unsigned char buffer[10*1024];
int do_unit(int startstop)
{
int status, i;
unsigned char *cmd;
unsigned char tmp;
for (i=0; i<10*1024; i++)
{
buffer[i] = 0;
}
*( (int *) buffer ) = 0; /* length of input data */
*( ((int *) buffer) + 1 ) = 0; /* length of output buffer */
cmd = (char *) ( ((int *) buffer) + 2 );
cmd[0] = 0x1b; /* START/STOP UNIT */
cmd[1] = 0x01; /* lun=0, immed=1 */
cmd[2] = 0x00; /* (reserved) */
cmd[3] = 0x00; /* (reserved) */
cmd[4] = startstop; /* start or stop */
cmd[5] = 0x00; /* control */
status = ioctl( fileno(infile), 1 /* SCSI_IOCTL_SEND_COMMAND */, buffer );
if(status) printf( "ioctl(SCSI_IOCTL_SEND_COMMAND) status\t= %d\n", status );
return status;
}
void usage(char * errtext){
int i;
fprintf(stderr,"Error: %s\n", errtext);
fprintf(stderr,"Usage: ./unit [start|stop] device\n");
exit(0);
}
int main( int argc, char *argv[])
{
int startstop;
if (argc != 3)
usage("number of parameters invalid");
if (!strcmp(argv[1],"start"))
startstop = 1;
else
if (!strcmp(argv[1],"stop"))
startstop = 0;
else
usage("must be start or stop");
infile = fopen( argv[2], "r" );
if(!infile) {
perror("unit(fopen)");
exit(0);
}
do_unit(startstop);
return 0;
}
--
Philippe Strauss <philou@lili.urbanet.ch>
Homepage & PGP key: http://lili.urbanet.ch
"I know not with what weapons World War III will be fought, but World
War IV will be fought with sticks and stones." -- Albert Einstein
--
