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#!/bin/bash
################################################
#
# Spin down the given SCS disk(s).
#
# SCSI disks (or disks that understand SCSI commands)
# are assumed. By default, the immediate bit is set so the
# command should return immediately. The disk however will
# take 10 seconds or more to spin down. The '-w' option
# causes each stop to wait until the disk reports that it
# has stopped.
#
# This script assumes the sg3_utils package is installed.
#
###############################################
verbose=""
immediate="-i"
usage()
{
echo "Usage: scsi_stop [-h] [-v] [-w] <device>+"
echo " where:"
echo " -h, --help print usage message"
echo " -v, --verbose more verbose output"
echo " -w, --wait wait for each stop to complete"
echo ""
echo "Send SCSI START STOP UNIT command to stop each <device>"
}
opt="$1"
while test ! -z "$opt" -a -z "${opt##-*}"; do
opt=${opt#-}
case "$opt" in
h|-help) usage ; exit 0 ;;
v|-verbose) verbose="-v" ;;
w|-wait) immediate="" ;;
*) echo "Unknown option: -$opt " ; exit 1 ;;
esac
shift
opt="$1"
done
if [ $# -lt 1 ]
then
usage
exit 1
fi
for i
do
# Use '-r' (read-only) otherwise using a block device node
# (e.g. 'sg_start 0 /dev/sdb') can result in a change of state
# event causing the disk to spin up again immediately.
echo "sg_start -r $immediate 0 $verbose $i"
sg_start -r $immediate 0 $verbose $i
done
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