#!/bin/sh

# Scan for, fsck, and mount SAN-based mountpoints with and without LVM

# This script makes several assumptions, if your not careful bad things may happen
# (what exactly I'm not sure, I haven't tested outside these bounds):
#
# Assumptions:
#  * There is only 1 partition on each SAN volume (partition #1)
#  * All SAN-based volume groups have the word 'iscsi/fc/san' somewhere in their name
#  * All multipathed physical devices have a device-mapper name that starts with 2 numbers
#	* Our 3PAR array presents volumes as "350002[..]"
#	* Our Openfiler presents volumes as "14f70656e66696[..]"
#  * All filesystems to be mounted are in /etc/fstab and are ext3, with the 'noauto' option
#  * Nothing is using the mountpoints when 'stop' is issued (to unmount the volumes)
#  * If your activating a brand new iSCSI volume, and you create a partition on it, either
#    create one on the first disk of the group(multipath -l) for the volume, or restart
#    the iSCSI subsystem afterwards, else the physical /dev/ device won't get e2fsck'd
#    because the /dev/ device doesn't exist.  Not a big deal just an example:
#	* New volume created, multipath -l lists sde sdf sdg sdh as the scsi devices
#	* You create a partition on /dev/sdg
#	* System auto creates  /dev/sdg1 device
#	* Despite the partition existing on the other disks sde sdf sdh the system isn't
#	  aware of this yet since it happened transparently so /dev/sde1 does not get
#	  created. This script goes to scan /dev/sde1 (it only attempts to scan the first
#	  disk), does not find the device and fails. This does not appear to impact
#	  the ability to mount the disk.


case $1 in
start)
	echo "Scanning and activating SAN-based volume groups"
	pvscan 2>&1 | grep -v "Incorrect metadata"
	vgimport -a 2>&1 | grep -v "Incorrect metadata"
	for i in `lvdisplay  -c 2>&1 | grep -v "Incorrect metadata" | grep '\(iscsi-\|san-\|fiber-\|fc-\)' | awk -F : '{print $1}'`; do 
		lvchange -ay $i 2>&1 | grep -v "Incorrect metadata";
	done
	echo "Checking LVM SAN filesystems.."
	for i in `lvdisplay -c 2>&1 | grep '\(iscsi-\|san-\|fiber-\|fc-\)' | awk -F : '{print $1}' | grep -v "Incorrect metadata"`; do
		e2fsck -y $i;
	done
	echo "Finished checking LVM SAN filesystems.."	

	echo -n "Scanning and mounting multipathed filesystems..."
	for i in `cat /etc/fstab  | egrep "^/dev.*ext3.*noauto" | awk '{print $2}'`; do
	echo -n "..[${i}]..";
	mkdir -p $i
	mount $i;
	done

	# this is critical otherwise the OS will not unmount the filesystems
	# on shutdown and the system may/will hang!
	touch /var/lock/subsys/mount_san

	echo "done!"
	grep -q "cssd run" /etc/inittab
	RETURN=$?
	if [ "$RETURN" == 0 ]; then
		echo -n "Enabling Oracle CSS after mounting volumes."
		perl -pi -e s'/^#h1(.*)cssd run(.*)/h1${1}cssd run${2}/'g /etc/inittab
	        /sbin/telinit q
		echo "..done!"
	fi
	;;

stop)

	grep -q "cssd run" /etc/inittab
	RETURN=$?
	if [ "$RETURN" == 0 ]; then
		echo -n "Disabling Oracle CSS before unmounting volumes."
		perl -pi -e s'/^h1(.*)cssd run(.*)/#h1${1}cssd run${2}/'g /etc/inittab
	        /sbin/telinit q
		echo "..done!"
	fi

	echo -n "Scanning and un-mounting multipathed filesystems..."
	for i in `cat /etc/fstab  | egrep "^/dev.*ext3.*noauto" | awk '{print $2}'`; do
	echo -n "..[${i}]..";
	umount $i;
	done
	echo "done!"

	# This assumes the volumes are no longer in use, if they are not it will
	# fail

	echo "Scanning and exporting SAN based volume groups.."
	for i in `lvdisplay -c 2>&1 | grep -v "is exported" | grep -v "Incorrect metadata" | grep '\(iscsi-\|san-\|fiber-\|fc-\)' | awk -F : '{print $1}'`; do 
		lvchange -an $i 2>&1 | grep -v "Incorrect metadata";
	done

	for i in `vgdisplay -c 2>&1 | grep -v "is exported" | grep -v "Incorrect metadata" | grep '\(iscsi-\|san-\|fiber-\|fc-\)' | awk -F : '{print $1}'`; do 
		vgexport $i 2>&1 | grep -v "Incorrect metadata";
	done

	# this isn't as critical, but doesn't hurt.
	rm -f /var/lock/subsys/mount_san
	;;

*)
	echo "Usage: $0 [ start | stop ]"
	;;
esac

exit