diff --git a/zfsync.sh b/zfsync.sh
index f878cb5..b8dc3bc 100755
--- a/zfsync.sh
+++ b/zfsync.sh
@@ -3,26 +3,42 @@
 # zfsync: sync zfs pool(s) between two servers
 
 # in case of failure, unepexpected reboot while syncing, etc.:
+#
+# launch "zfsync.sh init"
+#
+# or manually:
+#
 # - destroy all snapshots on both local & ${bro}
 # - for i in ftp web mail; do zfs snapshot servers/$i/home@newsync ;done
 # - for i in ftp web mail; do zfs send servers/$i/home@newsync | ssh ${bro} zfs receive -vFd servers ;done
 # - for i in ftp web mail; do zfs rename servers/$i/home@newsync servers/$i/home@prevsync ;done
-# - ssh ${bro} "for i in ftp web mail; do zfs rename servers/$i/home@newsync servers/$i/home@prevsync ;done"
+# - ssh ${bro} 'for i in ftp web mail; do zfs rename servers/$i/home@newsync servers/$i/home@prevsync ;done'
+
 
 bro="small"
 pools="ftp mail web"
 
-SENDNSCA=/usr/local/sbin/send_nsca\ -H\ <nagios_host>\ -d\ ';;'\ -c\ /usr/local/etc/nagios/send_nsca.cfg
+SENDNSCA=/usr/local/sbin/send_nsca\ -H\ 192.168.3.3\ -d\ ';;'\ -c\ /usr/local/etc/nagios/send_nsca.cfg
 HOSTNAME=`/bin/hostname -f | /usr/bin/cut -d '.' -f 1,1`
 SERVICENAME=zfsync
 LOGFILE=/tmp/zfsync.log
+LOCKFILE=/tmp/zfsync.lock
+ZROOT=zdata/servers
 sync_success=1
 
+if [ -e $LOCKFILE ]
+then
+	echo "ERROR: $0 is already running with pid `cat $LOCKFILE`, check $LOCKFILE"
+	exit 1
+fi
+echo ${$}>$LOCKFILE
+
 alert()
 {
 	echo "${HOSTNAME};;${SERVICENAME};;2;CRITICAL - ZFS Sync failed at `date`, please check ${LOGFILE} for complete report." | ${SENDNSCA} >/dev/null
 	exit $?
 }
+
 if [ $1 ]
 then
 if [ $1 = "init" ]
@@ -32,12 +48,13 @@ echo "`date`: ZFSync INIT starting."
 	for snapshot in `zfs list -t snapshot -o name | grep -e prevsync -e newsync`; do zfs destroy $snapshot ; done
 	ssh -q ${bro} 'for snapshot in `zfs list -t snapshot -o name | grep -e prevsync -e newsync`; do zfs destroy $snapshot ; done'
 	echo "making full snapshots"
-	for jail in $pools; do zfs snapshot servers/$jail/home@newsync;done
+	for jail in $pools; do zfs snapshot $ZROOT/$jail/home@newsync;done
 	echo "sending full snapshots"
-	for jail in $pools; do zfs send servers/$jail/home@newsync | ssh -q ${bro} 'zfs receive -vFd servers' ;done
+	for jail in $pools; do zfs send $ZROOT/$jail/home@newsync | ssh -q ${bro} 'zfs receive -vFd zdata' ;done
 	echo "renaming them to use them as a base for diff snapshots"
-	for jail in $pools; do zfs rename servers/$jail/home@newsync servers/$jail/home@prevsync ;done
-	ssh -q ${bro} 'for jail in ftp mail web; do zfs rename servers/$jail/home@newsync servers/$jail/home@prevsync ;done'
+	for jail in $pools; do zfs rename $ZROOT/$jail/home@newsync $ZROOT/$jail/home@prevsync ;done
+	ssh -q ${bro} 'for jail in ftp mail web; do zfs rename zdata/servers/$jail/home@newsync zdata/servers/$jail/home@prevsync ;done'
+echo "`date`: ZFSync INIT ending."
 	exit $?
 fi
 fi
@@ -45,16 +62,19 @@ fi
 echo "`date`: ZFSync starting."
 for pool in $pools
 do
-	dataset="servers/${pool}/home"
+	dataset="$ZROOT/${pool}/home"
 	echo "making new snapshot for ${pool}"
 	zfs snapshot ${dataset}@newsync || alert
 	echo "sending snapshot"
-	zfs send -i prevsync ${dataset}@newsync | ssh -q ${bro} "zfs receive -vFd servers" || alert
+	zfs send -i prevsync ${dataset}@newsync | ssh -q ${bro} "zfs receive -vFd zdata" || alert
 	echo "cleaning"
 	zfs destroy ${dataset}@prevsync || alert
 	zfs rename ${dataset}@newsync ${dataset}@prevsync || alert
 	ssh -q ${bro} "zfs destroy ${dataset}@prevsync && zfs rename ${dataset}@newsync ${dataset}@prevsync" || alert
 done
+echo "`date`: ZFSync ending."
 
 echo
 echo "${HOSTNAME};;${SERVICENAME};;0;OK - ZFS Sync succeeded at `date`" | ${SENDNSCA} >/dev/null
+
+rm -f $LOCKFILE