Send SCSI-3 Persistent Reserve/Release command using sg_persist

scsi_pr.sh

#!/bin/sh

# Send SCSI-3 Persistent Reserve/Release command using sg_persist
# Inspired by http://www.redhat.com/archives/cluster-devel/2006-June/msg00084.html

# eg1. send SCSI Persistent Reserve to /dev/sde,
#      where type of PROUT is "exclusive access - registrants only"
#      $ sudo ./scsi_pr.sh reserve /dev/sde 6
# eg2. send SCSI Persistent Release to /dev/sde,
#      where type of PROUT is "exclusive access - registrants only"
#      $ sudo ./scsi_pr.sh release /dev/sde 6

if [ x"$#" != x"3" ]; then
        echo "$0 cmd dev type"
        exit 1
fi
cmd=$1; shift
dev=$1; shift
type=$1; shift

key=$(gethostip -x $(uname -n))
echo "cmd=${cmd}, key=${key}, type=${type}"

echo "==> initial state"
sg_persist -d ${dev} -i -k

case ${cmd} in
reserve)
        echo "===> step 2"
        sg_persist -d ${dev} -o -G -S ${key}
        echo "===> step 3"
        sg_persist -d ${dev} -o -R -K ${key} -T ${type}
        ;;
release)
        echo "===> step 2"
        sg_persist -d ${dev} -o -L -K ${key} -T ${type}
        echo "===> step 3"
        sg_persist -d ${dev} -o -G -K ${key} -S 0
        ;;
*)
        echo "unknown cmd: ${cmd}"
        exit 1
        ;;
esac

echo "==> result"
sg_persist -d ${dev} -i -k