#!/bin/bash
#
# lustre_createcsv - generate a csv file from a running lustre cluster
#
# This script is used to collect lustre target informations, linux MD/LVM device
# informations and HA software configurations in a lustre cluster to generate a
# csv file. In reverse, the csv file could be parsed by lustre_config to 
# configure multiple lustre servers in parallel.
#
# This script should be run on the MGS node.
#
################################################################################

# Usage
usage() {
	cat >&2 <<EOF

Usage:	`basename $0` [-t HAtype] [-d] [-h] [-v] [-f csv_filename]

	This script is used to collect lustre target informations, linux MD/LVM
	device informations and HA software configurations from a running lustre
	cluster to generate a csv file. It should be run on the MGS node.

	-t HAtype	collect High-Availability software configurations
			The argument following -t is used to indicate the High-
			Availability software type. The HA software types which 
			are currently supported are: hbv1 (Heartbeat version 1)
			and hbv2 (Heartbeat version 2).
	-d		collect linux MD/LVM device informations
	-h		help
	-v		verbose mode
	-f csv_filename	designate a name for the csv file
			Default is lustre_config.csv.

EOF
	exit 1
}

# Get the library of functions
. @scriptlibdir@/lc_common

#**************************** Global variables ****************************#
# csv file
LUSTRE_CSV_FILE=${LUSTRE_CSV_FILE:-"lustre_config.csv"}

# Lustre proc files
LUSTRE_PROC=${LUSTRE_PROC:-"/proc/fs/lustre"}
LUSTRE_PROC_DEVICES=${LUSTRE_PROC}/devices

LNET_PROC=${LNET_PROC:-"/proc/sys/lnet"}
LNET_PROC_PEERS=${LNET_PROC}/peers

# Default network module options
DEFAULT_MOD_OPTS=${DEFAULT_MOD_OPTS:-"options lnet networks=tcp"}

# Lustre target obd device types
MGS_TYPE=${MGS_TYPE:-"mgs"}
MDT_TYPE=${MDT_TYPE:-"mds"}
OST_TYPE=${OST_TYPE:-"obdfilter"}

# The obd name of MGS target server
MGS_SVNAME=${MGS_SVNAME:-"MGS"}		

# Hostnames of the lustre cluster nodes
declare -a HOST_NAMES			
MGS_HOSTNAME=${MGS_HOSTNAME:-"`hostname`"} # Hostname of the MGS node

# Configs of lustre targets in one cluster node
declare -a TARGET_CONFIGS		
declare -a TARGET_SVNAMES TARGET_DEVNAMES TARGET_DEVSIZES TARGET_MNTPNTS
declare -a TARGET_DEVTYPES TARGET_FSNAMES TARGET_MGSNIDS TARGET_INDEXES
declare -a TARGET_FMTOPTS TARGET_MKFSOPTS TARGET_MNTOPTS TARGET_FAILNIDS
declare -a HA_CONFIGS
declare -a ALL_TARGET_SVNAMES		# All the target services in the cluster
declare -a FAILOVER_FMTOPTS		# "--noformat"	

# Informations of linux MD/LVM devices in one cluster node
declare -a MD_NAME MD_LEVEL MD_DEVS	# MD
declare -a VG_NAME VG_PVNAMES		# VG
declare -a LV_NAME LV_SIZE LV_VGNAME	# LV

# Lustre target service types
let "LDD_F_SV_TYPE_MDT = 0x0001"
let "LDD_F_SV_TYPE_OST = 0x0002"
let "LDD_F_SV_TYPE_MGS = 0x0004"

# Permanent mount options for ext3 or ldiskfs
ALWAYS_MNTOPTS=${ALWAYS_MNTOPTS:-"errors=remount-ro"}
MDT_MGS_ALWAYS_MNTOPTS=${MDT_MGS_ALWAYS_MNTOPTS:-",iopen_nopriv,user_xattr"}
OST_ALWAYS_MNTOPTS=${OST_ALWAYS_MNTOPTS:-",asyncdel"}
OST_DEFAULT_MNTOPTS=${OST_DEFAULT_MNTOPTS:-",extents,mballoc"}

# User-settable parameter keys
PARAM_MGSNODE=${PARAM_MGSNODE:-"mgsnode="}
PARAM_FAILNODE=${PARAM_FAILNODE:-"failover.node="}

# Block size
L_BLOCK_SIZE=4096

# Option string of mkfs.lustre
OPTSTR_STRIPE_COUNT=${OPTSTR_STRIPE_COUNT:-"--stripe-count-hint="}


# Get and check the positional parameters
VERBOSE_OUTPUT=false
GET_MDLVM_INFO=false
while getopts "t:dhvf:" OPTION; do
	case $OPTION in
	t) 
		HATYPE_OPT=$OPTARG
		if [ "${HATYPE_OPT}" != "${HBVER_HBV1}" ] \
		&& [ "${HATYPE_OPT}" != "${HBVER_HBV2}" ] \
		&& [ "${HATYPE_OPT}" != "${HATYPE_CLUMGR}" ]; then
			echo >&2 "`basename $0`: Invalid HA software type" \
				 "- ${HATYPE_OPT}!"
			usage
		fi
		;;
	d)	GET_MDLVM_INFO=true;;
	h)	usage;;
	v) 	VERBOSE_OUTPUT=true;;
	f)	LUSTRE_CSV_FILE=$OPTARG;;
        ?) 	usage 
	esac
done

# Verify the local host is the MGS node
mgs_node() {
	if [ ! -e ${LUSTRE_PROC_DEVICES} ]; then
		echo >&2 "`basename $0`: error: ${LUSTRE_PROC_DEVICES} does" \
			 "not exist. Lustre kernel modules may not be loaded!"
		return 1
	fi

	if [ -z "`cat ${LUSTRE_PROC_DEVICES}`" ]; then
		echo >&2 "`basename $0`: error: ${LUSTRE_PROC_DEVICES} is" \
			 "empty. Lustre services may not be started!"
		return 1
	fi

	if [ -z "`grep ${MGS_TYPE} ${LUSTRE_PROC_DEVICES}`" ]; then
		echo >&2 "`basename $0`: error: This node is not a MGS node." \
                         "The script should be run on the MGS node!"
		return 1
	fi

	return 0
}

# get_hostnames
# Get lustre cluster node names
get_hostnames() {
	declare -a HOST_NIDS
	declare -i idx		# Index of HOST_NIDS array
	declare -i i		# Index of HOST_NAMES array

	if ! mgs_node; then
		return 1
	fi

	if [ ! -e ${LNET_PROC_PEERS} ]; then
		echo >&2 "`basename $0`: error: ${LNET_PROC_PEERS} does not" \
                         "exist. LNET kernel modules may not be loaded" \
			 "or LNET network may not be up!"
		return 1
	fi

	HOST_NAMES[0]=${MGS_HOSTNAME} # MGS node
	HOST_NIDS[0]=${HOST_NAMES[0]}

	# Get the nids of the nodes which have contacted MGS
	idx=1
	for nid in `cat ${LNET_PROC_PEERS} | awk '{print $1}'`; do
		if [ "${nid}" = "nid" ]; then
			continue
		fi

		HOST_NIDS[idx]=${nid}
		let "idx += 1"
	done

	if [ ${idx} -eq 1 ]; then
		verbose_output "Only one node running in the lustre cluster." \
			       "It's ${HOST_NAMES[0]}."
		return 0		
	fi

	# Get the hostnames of the nodes
	for ((idx = 1, i = 1; idx < ${#HOST_NIDS[@]}; idx++, i++)); do
		if [ -z "${HOST_NIDS[idx]}" ]; then
			echo >&2 "`basename $0`: get_hostnames() error:" \
				 "Invalid nid - \"${HOST_NIDS[idx]}\"!"
			return 1
		fi

		HOST_NAMES[i]=$(nid2hostname ${HOST_NIDS[idx]})
		if [ $? -ne 0 ]; then
			echo >&2 "${HOST_NAMES[i]}"
			return 1
		fi

		if [ "${HOST_NAMES[i]}" = "${HOST_NAMES[0]}" ]; then
			unset HOST_NAMES[i]
			let "i -= 1"
		fi
	done

	return 0
}

#********************** Linux MD/LVM device informations **********************#
# get_md_configs hostname
# Get all the active MD device informations from the node @hostname
get_md_configs() {
	declare -i i=0
	declare -i j=0
	local host_name=$1
	local ret_line line first_item

	# Initialize the arrays
	unset MD_NAME
	unset MD_LEVEL
	unset MD_DEVS
	
	# Execute remote command to the node ${host_name} and get all the
	# active MD device informations.
	while read -r ret_line; do
		if is_pdsh; then
                	set -- ${ret_line}
			shift
			line="$*"
		else
			line="${ret_line}"
		fi

		first_item=`echo "${line}" | awk '{print $1}'`

		# Get the MD device name and raid level
		if [ "${first_item}" = "ARRAY" ]; then
			MD_NAME[i]=`echo "${line}" | awk '{print $2}'`
			MD_LEVEL[i]=`echo "${line}" | awk '{print $3}' | sed -e 's/level=//'`
			let "j = i"
			let "i += 1"
		fi

		# Get the MD component devices
		if [ "${first_item}" != "${first_item#devices=}" ]; then
			MD_DEVS[j]=`echo "${line}" | sed -e 's/devices=//' -e 's/,/ /g'`
		fi
        done < <(${REMOTE} ${host_name} "${MDADM} --detail --scan --verbose")

	if [ $i -eq 0 ]; then
		verbose_output "There are no active MD devices" \
			       "in the host ${host_name}!"
	fi

	return 0
}

# get_pv_configs hostname
# Get all the LVM PV informations from the node @hostname
get_pv_configs() {
	PV_NAMES=
	local host_name=$1
	local cmd ret_str

	# Execute remote command to get all the PV informations.
	cmd="${EXPORT_PATH} pvdisplay -c | awk -F: '{print \$1}' | xargs"
	ret_str=`${REMOTE} ${host_name} "${cmd}" 2>&1`
	if [ $? -ne 0 ]; then
		if [ -n "${ret_str}" ]; then
			echo >&2 "`basename $0`: get_pv_configs() error:" \
			"remote command to ${host_name} error: ${ret_str}"
		else
			remote_error "get_pv_configs" ${host_name}
		fi
		return 1
	fi

	PV_NAMES=`echo "${ret_str}" | sed -e 's/^'${host_name}':[[:space:]]//'`
	if [ -z "${PV_NAMES}" ]; then
		verbose_output "There are no PVs in the host ${host_name}!"
		return 0
	fi

	return 0
}

# get_vg_pvnames hostname vgname
# Get the PVs contained in @vgname from the node @hostname
get_vg_pvnames() {
	local host_name=$1
	local vg_name=$2
	local pv_names=
	local cmd ret_str

	# Execute remote command to get the PV names.
	cmd="${EXPORT_PATH} vgdisplay -v ${vg_name} 2>/dev/null\
	     | grep \"PV Name\" | awk '{print \$3}' | xargs"
	ret_str=`${REMOTE} ${host_name} "${cmd}" 2>&1`
	if [ $? -ne 0 ]; then
		if [ -n "${ret_str}" ]; then
			echo "`basename $0`: get_vg_pvnames() error:" \
			"remote command to ${host_name} error: ${ret_str}"
		else
			remote_error "get_vg_pvnames" ${host_name}
		fi
		return 1
	fi

	pv_names=`echo "${ret_str}" | sed -e 's/^'${host_name}':[[:space:]]//'`
	if [ -z "${pv_names}" ]; then
		echo "`basename $0`: get_vg_pvnames() error:" \
		"There are no PVs in VG ${vg_name} in the host ${host_name}!"\
		"Or VG ${vg_name} does not exist."
		return 1
	fi

	echo "${pv_names}"
	return 0
}

# get_vg_configs hostname
# Get all the LVM VG informations from the node @hostname
get_vg_configs() {
	declare -i i=0
	local host_name=$1
	local cmd ret_str
	local vg_name

	# Initialize the arrays
	unset VG_NAME
	unset VG_PVNAMES

	# Execute remote command to get all the VG names.
	cmd="${EXPORT_PATH} vgdisplay \
	     | grep \"VG Name\" | awk '{print \$3}' | xargs"
	ret_str=`${REMOTE} ${host_name} "${cmd}" 2>&1`
	if [ $? -ne 0 ]; then
		if [ -n "${ret_str}" ]; then
			echo >&2 "`basename $0`: get_vg_configs() error:" \
			"remote command to ${host_name} error: ${ret_str}"
		else
			remote_error "get_vg_configs" ${host_name}
		fi
		return 1
	fi

	if [ -z "${ret_str}" ] \
	|| [ "${ret_str}" != "${ret_str#*No volume groups found*}" ]; then
		verbose_output "There are no VGs in the host ${host_name}!"
		return 0
	fi

	# Get all the VG informations
	for vg_name in `echo "${ret_str}" | sed -e 's/^'${host_name}'://'`; do
		VG_NAME[i]=${vg_name}
		VG_PVNAMES[i]=$(get_vg_pvnames ${host_name} ${VG_NAME[i]})
		if [ $? -ne 0 ]; then
			echo >&2 "${VG_PVNAMES[i]}"
			return 1
		fi
		let "i += 1"
	done

	return 0
}

# get_lv_configs hostname
# Get all the LVM LV informations from the node @hostname
get_lv_configs() {
	declare -i i=0
	local host_name=$1
	local ret_line line

	# Initialize the arrays
	unset LV_NAME
	unset LV_SIZE
	unset LV_VGNAME

	# Execute remote command to get all the LV informations.
	while read -r ret_line; do
		if is_pdsh; then
                	set -- ${ret_line}
			shift
			line="$*"
		else
			line="${ret_line}"
		fi

		[ "${line}" != "${line#*volume group*}" ] && break

		LV_NAME[i]=`echo "${line}" | awk -F: '{print $1}' | sed -e 's/.*\///g'`
		LV_VGNAME[i]=`echo "${line}" | awk -F: '{print $2}'`
		LV_SIZE[i]=`echo "${line}" | awk -F: '{print $7}' | sed -e 's/.*/&K/'`

		let "i += 1"
        done < <(${REMOTE} ${host_name} "${EXPORT_PATH} lvdisplay -c")

	if [ $i -eq 0 ]; then
		verbose_output "There are no LVs in the host ${host_name}"
	fi

	return 0
}

#*************************** Network module options ***************************#
# last_is_backslash line
# Check whether the last effective letter of @line is a backslash
last_is_backslash() {
	local line="$*"
	declare -i i
	declare -i length
	local letter last_letter

	length=${#line}
	for ((i = ${length}-1; i >= 0; i--)); do
		letter=${line:${i}:1}
        	[ "x${letter}" != "x " -a "x${letter}" != "x	" -a -n "${letter}" ]\
		&& last_letter=${letter} && break
	done

	[ "x${last_letter}" = "x\\" ] && return 0

	return 1
}

# get_module_opts hostname
# Get the network module options from the node @hostname 
get_module_opts() {
	local host_name=$1
	local ret_str
	local MODULE_CONF KERNEL_VER
	local ret_line line find_options
	local continue_flag

	MODULE_OPTS=${DEFAULT_MOD_OPTS}

	# Execute remote command to get the kernel version
	ret_str=`${REMOTE} ${host_name} "uname -r" 2>&1`
	if [ $? -ne 0 -a -n "${ret_str}" ]; then
		echo >&2 "`basename $0`: get_module_opts() error:" \
			 "remote command error: ${ret_str}"
		return 1
	fi
	remote_error "get_module_opts" ${host_name} "${ret_str}" && return 1

	if is_pdsh; then
		KERNEL_VER=`echo ${ret_str} | awk '{print $2}'`
	else
		KERNEL_VER=`echo ${ret_str} | awk '{print $1}'`
	fi

	# Get the module configuration file name
	if [ "${KERNEL_VER:0:3}" = "2.4" ]; then
        	MODULE_CONF=/etc/modules.conf
	else
        	MODULE_CONF=/etc/modprobe.conf
	fi

	# Execute remote command to get the lustre network module options
	continue_flag=false
	find_options=false
	while read -r ret_line; do
		if is_pdsh; then
                	set -- ${ret_line}
			shift
			line="$*"
		else
			line="${ret_line}"
		fi

		# Get rid of the comment line
		[ -z "`echo \"${line}\"|egrep -v \"^#\"`" ] && continue

		if [ "${line}" != "${line#*options lnet*}" ]; then
			if ! ${find_options}; then
				find_options=true
				MODULE_OPTS=${line}
			else
				MODULE_OPTS=${MODULE_OPTS}$" \n "${line}
			fi

			last_is_backslash "${line}" && continue_flag=true \
			|| continue_flag=false
			continue
		fi	

		if ${continue_flag}; then
			MODULE_OPTS=${MODULE_OPTS}$" \n "${line}
			! last_is_backslash "${line}" && continue_flag=false

		fi
        done < <(${REMOTE} ${host_name} "cat ${MODULE_CONF}")

	if [ -z "${MODULE_OPTS}" ]; then
		MODULE_OPTS=${DEFAULT_MOD_OPTS}
	fi

	return 0
}

#************************ HA software configurations ************************#
# is_ha_target hostname target_devname
# Check whether the target @target_devname was made to be high-available
is_ha_target() {
	local host_name=$1
	local target_svname=$2
	local res_file
	local ret_str

	case "${HATYPE_OPT}" in
	"${HBVER_HBV1}")	res_file=${HA_RES};;
	"${HBVER_HBV2}")	res_file=${HA_CIB};;
	"${HATYPE_CLUMGR}")	res_file=${CLUMAN_CONFIG};;
	esac

	# Execute remote command to check the resource file
	ret_str=`${REMOTE} ${host_name} \
		"grep ${target_svname} ${res_file}" 2>&1`
	if [ $? -ne 0 -a -n "${ret_str}" ]; then
		echo >&2 "`basename $0`: is_ha_target() error:" \
			 "remote command error: ${ret_str}"
		return 1
	fi

	[ "${ret_str}" = "${ret_str#*${target_svname}*}" ] && return 1

	return 0
}

# get_hb_configs hostname
# Get the Heartbeat configurations from the node @hostname
get_hb_configs() {
	local host_name=$1
	local ret_line line
	declare -i i

	unset HA_CONFIGS
	HB_CHANNELS=
	SRV_IPADDRS=
	HB_OPTIONS=

	# Execute remote command to get the configs of Heartbeat channels, etc
	while read -r ret_line; do
		if is_pdsh; then
                	set -- ${ret_line}
			shift
			line="$*"
		else
			line="${ret_line}"
		fi

                # Get rid of the comment line
                [ -z "`echo \"${line}\"|egrep -v \"^#\"`" ] && continue

		if [ "${line}" != "${line#*serial*}" ] \
		|| [ "${line}" != "${line#*cast*}" ]; then
			if [ -z "${HB_CHANNELS}" ]; then
				HB_CHANNELS=${line}
			else
				HB_CHANNELS=${HB_CHANNELS}:${line}
			fi
		fi

		if [ "${line}" != "${line#*stonith*}" ] \
		|| [ "${line}" != "${line#*ping*}" ] \
		|| [ "${line}" != "${line#*respawn*}" ] \
		|| [ "${line}" != "${line#*apiauth*}" ] \
		|| [ "${line}" != "${line#*compression*}" ]; then
			if [ -z "${HB_OPTIONS}" ]; then
				HB_OPTIONS=${line}
			else
				HB_OPTIONS=${HB_OPTIONS}:${line}
			fi
		fi
        done < <(${REMOTE} ${host_name} "cat ${HA_CF}")

	if [ -z "${HB_CHANNELS}" ]; then
		echo >&2 "`basename $0`: get_hb_configs() error:" \
			 "There are no heartbeat channel configs in ${HA_CF}" \
			 "of host ${host_name} or ${HA_CF} does not exist!"
		return 0
	fi

	# Execute remote command to get Heartbeat service address
	if [ "${HATYPE_OPT}" = "${HBVER_HBV1}" ]; then
		while read -r ret_line; do
			if is_pdsh; then
                		set -- ${ret_line}
				shift
				line="$*"
			else
				line="${ret_line}"
			fi

			# Get rid of the empty line
                	[ -z "`echo ${line}|awk '/[[:alnum:]]/ {print $0}'`" ]\
                        && continue

                	# Get rid of the comment line
                	[ -z "`echo \"${line}\"|egrep -v \"^#\"`" ] && continue

			SRV_IPADDRS=`echo ${line} | awk '{print $2}'`
			[ -n "${SRV_IPADDRS}" ] \
			&& [ "`echo ${line} | awk '{print $1}'`" = "${host_name}" ] && break
        	done < <(${REMOTE} ${host_name} "cat ${HA_RES}")
	
		if [ -z "${SRV_IPADDRS}" ]; then
			echo >&2 "`basename $0`: get_hb_configs() error: There"\
			 	 "are no service address in ${HA_RES} of host"\
			 	 "${host_name} or ${HA_RES} does not exist!"
			return 0
		fi
	fi

	# Construct HA configuration items 
	for ((i = 0; i < ${#TARGET_DEVNAMES[@]}; i++)); do
		[ -z "${TARGET_DEVNAMES[i]}" ] && continue

		# Execute remote command to check whether this target service 
		# was made to be high-available
		if is_ha_target ${host_name} ${TARGET_DEVNAMES[i]}; then
			HA_CONFIGS[i]=${HB_CHANNELS},${SRV_IPADDRS},${HB_OPTIONS}
		fi
	done

	return 0
}

# get_cluman_channel hostname
# Get the Heartbeat channel of CluManager from the node @hostname
get_cluman_channel() {
	local host_name=$1
	local ret_line line
	local cluman_channel=
	local mcast_ipaddr

	while read -r ret_line; do
		if is_pdsh; then
                	set -- ${ret_line}
			shift
			line="$*"
		else
			line="${ret_line}"
		fi

		if [ "${line}" != "${line#*broadcast*}" ] \
		&& [ "`echo ${line}|awk '{print $3}'`" = "yes" ]; then
			cluman_channel="broadcast"
			break
		fi

		if [ "${line}" != "${line#*multicast_ipaddress*}" ]; then
			mcast_ipaddr=`echo ${line}|awk '{print $3}'`
			if [ "${mcast_ipaddr}" != "225.0.0.11" ]; then
				cluman_channel="multicast ${mcast_ipaddr}"
				break
			fi
		fi
        done < <(${REMOTE} ${host_name} "${CONFIG_CMD} --clumembd")

	echo ${cluman_channel}
	return 0
}

# get_cluman_srvaddr hostname target_svname
# Get the service IP addresses of @target_svname from the node @hostname 
get_cluman_srvaddr() {
	local host_name=$1
	local target_svname=$2
	local ret_line line
	local srvaddr cluman_srvaddr=

	while read -r ret_line; do
		if is_pdsh; then
                	set -- ${ret_line}
			shift
			line="$*"
		else
			line="${ret_line}"
		fi

		if [ "${line}" != "${line#*ipaddress = *}" ]; then
			srvaddr=`echo ${line}|awk '{print $3}'`
			if [ -z "${cluman_srvaddr}" ]; then
				cluman_srvaddr=${srvaddr}			
			else
				cluman_srvaddr=${cluman_srvaddr}:${srvaddr}
			fi
		fi
        done < <(${REMOTE} ${host_name} "${CONFIG_CMD} \
		--service=${target_svname} --service_ipaddresses")

	if [ -z "${cluman_srvaddr}" ]; then
		echo "`basename $0`: get_cluman_srvaddr() error: Cannot" \
		"get the service IP addresses of ${target_svname} in" \
		"${host_name}! Check ${CONFIG_CMD} command!"
		return 1
	fi

	echo ${cluman_srvaddr}
	return 0
}

# get_cluman_configs hostname
# Get the CluManager configurations from the node @hostname
get_cluman_configs() {
	local host_name=$1
	local ret_str
	declare -i i

	unset HA_CONFIGS

	# Execute remote command to get the configs of CluManager
	for ((i = 0; i < ${#TARGET_DEVNAMES[@]}; i++)); do
		HB_CHANNELS=
		SRV_IPADDRS=
		HB_OPTIONS=
		[ -z "${TARGET_DEVNAMES[i]}" ] && continue

		# Execute remote command to check whether this target service 
		# was made to be high-available
		! is_ha_target ${host_name} ${TARGET_DEVNAMES[i]} && continue

		# Execute remote command to get Heartbeat channel
		HB_CHANNELS=$(get_cluman_channel ${host_name})
		if [ $? -ne 0 ]; then
			echo >&2 "${HB_CHANNELS}"
		fi

		# Execute remote command to get service IP address 
		SRV_IPADDRS=$(get_cluman_srvaddr ${host_name} \
			      ${TARGET_SVNAMES[i]})
		if [ $? -ne 0 ]; then
			echo >&2 "${SRV_IPADDRS}"
			return 0
		fi

		HA_CONFIGS[i]=${HB_CHANNELS},${SRV_IPADDRS},${HB_OPTIONS}
	done

	return 0
}

# get_ha_configs hostname
# Get the HA software configurations from the node @hostname
get_ha_configs() {
	local host_name=$1

	unset HA_CONFIGS

	if [ -z "${HATYPE_OPT}" ]; then
		return 0
	fi

	verbose_output "Collecting HA software configurations from host $1..."

	case "${HATYPE_OPT}" in
	"${HBVER_HBV1}" | "${HBVER_HBV2}") # Heartbeat
		if ! get_hb_configs ${host_name}; then
			return 1
		fi
		;;
	"${HATYPE_CLUMGR}") # CluManager
		if ! get_cluman_configs ${host_name}; then
			return 1
		fi
		;;
	esac

	return 0
}

#*********************** Lustre targets configurations ***********************#

# is_failover_service target_svname
# Check whether a target service @target_svname is a failover service.
is_failover_service() {
	local target_svname=$1
	declare -i i

	for ((i = 0; i < ${#ALL_TARGET_SVNAMES[@]}; i++)); do
		[ "${target_svname}" = "${ALL_TARGET_SVNAMES[i]}" ] && return 0
	done

	return 1
}

# get_svnames hostname
# Get the lustre target server obd names from the node @hostname
get_svnames(){
	declare -i i
	declare -i j
	local host_name=$1
	local ret_line line

        # Initialize the TARGET_SVNAMES array
	unset TARGET_SVNAMES
	unset FAILOVER_FMTOPTS
	
	# Execute remote command to the node @hostname and figure out what
	# lustre services are running.
	i=0
	j=${#ALL_TARGET_SVNAMES[@]}
	while read -r ret_line; do
		if is_pdsh; then
                	set -- ${ret_line}
			shift
			line="$*"
		else
			line="${ret_line}"
		fi

		if [ -z "`echo ${line} | grep ${MGS_TYPE}`" ] \
		&& [ -z "`echo ${line} | grep ${MDT_TYPE}`" ] \
		&& [ -z "`echo ${line} | grep ${OST_TYPE}`" ]; then
			continue
		fi

		# Get target server name
		TARGET_SVNAMES[i]=`echo ${line} | awk '{print $4}'`
		if [ -n "${TARGET_SVNAMES[i]}" ]; then
			if is_failover_service ${TARGET_SVNAMES[i]}; then
				FAILOVER_FMTOPTS[i]="--noformat"
			fi
			ALL_TARGET_SVNAMES[j]=${TARGET_SVNAMES[i]}
			let "i += 1"
			let "j += 1"
		else
			echo >&2 "`basename $0`: get_svnames() error: Invalid"\
			      "line in ${host_name}'s ${LUSTRE_PROC_DEVICES}"\
			      "- \"${line}\"!"
			return 1
		fi
        done < <(${REMOTE} ${host_name} "cat ${LUSTRE_PROC_DEVICES}")

	if [ $i -eq 0 ]; then
		verbose_output "There are no lustre services running" \
			       "on the node ${host_name}!"
	fi

	return 0
} 

# is_loopdev devname
# Check whether a device @devname is a loop device or not
is_loopdev() {
	local devname=$1

	if [ -z "${devname}" ] || \
	[ -z "`echo ${devname}|awk '/\/dev\/loop[[:digit:]]/ {print $0}'`" ]
	then
		return 1
	fi

	return 0
}

# get_devname hostname svname
# Get the device name of lustre target @svname from node @hostname
get_devname() {
	local host_name=$1
	local target_svname=$2
	local target_devname=
	local ret_str
	local target_type target_obdtype mntdev_file

	if [ "${target_svname}" = "${MGS_SVNAME}" ]; then
		# Execute remote command to get the device name of mgs target
		ret_str=`${REMOTE} ${host_name} \
			"/sbin/findfs LABEL=${target_svname}" 2>&1`
		if [ $? -ne 0 -a -n "${ret_str}" ]; then
			if [ "${ret_str}" = "${ret_str#*Unable to resolve*}" ]
			then
				echo "`basename $0`: get_devname() error:" \
			     	     "remote command error: ${ret_str}"
				return 1
			fi
		fi

		if [ "${ret_str}" = "${ret_str#*Unable to resolve*}" ]; then
			if is_pdsh; then
				target_devname=`echo ${ret_str} | awk '{print $2}'`
			else
				target_devname=`echo ${ret_str} | awk '{print $1}'`
			fi
		fi
	else	# Execute remote command to get the device name of mdt/ost target
		target_type=`echo ${target_svname} | cut -d - -f 2`
		target_obdtype=${target_type:0:3}_TYPE
		
		mntdev_file=${LUSTRE_PROC}/${!target_obdtype}/${target_svname}/mntdev

		ret_str=`${REMOTE} ${host_name} "cat ${mntdev_file}" 2>&1`
		if [ $? -ne 0 -a -n "${ret_str}" ]; then
			echo "`basename $0`: get_devname() error:" \
			     "remote command error: ${ret_str}"
			return 1
		fi

		if [ "${ret_str}" != "${ret_str#*No such file*}" ]; then
			echo "`basename $0`: get_devname() error:"\
			     "${mntdev_file} does not exist in ${host_name}!"
			return 1
		else
			if is_pdsh; then
				target_devname=`echo ${ret_str} | awk '{print $2}'`
			else
				target_devname=`echo ${ret_str} | awk '{print $1}'`
			fi
		fi
	fi

	echo ${target_devname}
	return 0
}

# get_devsize hostname target_devname 
# Get the device size (KB) of @target_devname from node @hostname
get_devsize() {
	local host_name=$1
	local target_devname=$2
	local target_devsize=
	local ret_str

	# Execute remote command to get the device size
	ret_str=`${REMOTE} ${host_name} \
		"/sbin/blockdev --getsize ${target_devname}" 2>&1`
	if [ $? -ne 0 -a -n "${ret_str}" ]; then
		echo "`basename $0`: get_devsize() error:" \
		     "remote command error: ${ret_str}"
		return 1
	fi

	if is_pdsh; then
		target_devsize=`echo ${ret_str} | awk '{print $2}'`
	else
		target_devsize=`echo ${ret_str} | awk '{print $1}'`
	fi
	
	if [ -z "`echo ${target_devsize}|awk '/^[[:digit:]]/ {print $0}'`" ]
	then
		echo "`basename $0`: get_devsize() error: can't" \
		"get device size of ${target_devname} in ${host_name}!"
		return 1
	fi

	let " target_devsize /= 2"

	echo ${target_devsize}
	return 0
}

# get_realdevname hostname loop_dev
# Get the real device name of loop device @loop_dev from node @hostname
get_realdevname() {
	local host_name=$1
	local loop_dev=$2
	local target_devname=
	local ret_str

	# Execute remote command to get the real device name
	ret_str=`${REMOTE} ${host_name} \
		"/sbin/losetup ${loop_dev}" 2>&1`
	if [ $? -ne 0 -a -n "${ret_str}" ]; then
		echo "`basename $0`: get_realdevname() error:" \
		     "remote command error: ${ret_str}"
		return 1
	fi

	if is_pdsh; then
		target_devname=`echo ${ret_str} | awk '{print $4}' \
				| sed 's/^(//' | sed 's/)$//'`
	else
		target_devname=`echo ${ret_str} | awk '{print $3}' \
				| sed 's/^(//' | sed 's/)$//'`
	fi

	if [ "${ret_str}" != "${ret_str#*No such*}" ] \
	|| [ -z "${target_devname}" ]; then
		echo "`basename $0`: get_realdevname() error: can't" \
		"get info on device ${loop_dev} in ${host_name}!"
		return 1
	fi

	echo ${target_devname}
	return 0
}

# get_mntpnt hostname target_devname
# Get the lustre target mount point from the node @hostname
get_mntpnt(){
	local host_name=$1
	local target_devname=$2
	local mnt_point=
	local ret_str

	# Execute remote command to get the mount point
	ret_str=`${REMOTE} ${host_name} \
		"cat /etc/mtab | grep ${target_devname}" 2>&1`
	if [ $? -ne 0 -a -n "${ret_str}" ]; then
		echo "`basename $0`: get_mntpnt() error:" \
		     "remote command error: ${ret_str}"
		return 1
	fi

	if is_pdsh; then
		mnt_point=`echo ${ret_str} | awk '{print $3}'`
	else
		mnt_point=`echo ${ret_str} | awk '{print $2}'`
	fi
	
	if [ -z "${mnt_point}" ]; then
		echo "`basename $0`: get_mntpnt() error: can't" \
		"get the mount point of ${target_devname} in ${host_name}!"
		return 1
	fi

	echo ${mnt_point}
	return 0
}

# get_devnames hostname
# Get the lustre target device names, mount points
# and loop device sizes from the node @hostname
get_devnames(){
	declare -i i
	local host_name=$1
	local ret_line line

        # Initialize the arrays
	unset TARGET_DEVNAMES
	unset TARGET_DEVSIZES
	unset TARGET_MNTPNTS

	for ((i = 0; i < ${#TARGET_SVNAMES[@]}; i++)); do
		TARGET_DEVNAMES[i]=$(get_devname ${host_name} \
				     ${TARGET_SVNAMES[i]})
		if [ $? -ne 0 ]; then
			echo >&2 "${TARGET_DEVNAMES[i]}"
			return 1
		fi

		if [ -z "${TARGET_DEVNAMES[i]}" ]; then
			if [ "${TARGET_SVNAMES[i]}" = "${MGS_SVNAME}" ]; then
				verbose_output "There exists combo mgs/mdt"\
					       "target in ${host_name}."
				continue
			else
				echo >&2 "`basename $0`: get_devname() error:"\
			      		 "No device corresponding to target" \
					 "${TARGET_SVNAMES[i]} in ${host_name}!"
				return 1
			fi
		fi

		# Get the mount point of the target
		TARGET_MNTPNTS[i]=$(get_mntpnt ${host_name} \
				     ${TARGET_DEVNAMES[i]})
		if [ $? -ne 0 ]; then
			echo >&2 "${TARGET_MNTPNTS[i]}"
			return 1
		fi

		# The target device is a loop device?
		if [ -n "${TARGET_DEVNAMES[i]}" ] \
		&& is_loopdev ${TARGET_DEVNAMES[i]}; then 
			# Get the device size
			TARGET_DEVSIZES[i]=$(get_devsize ${host_name} \
					     ${TARGET_DEVNAMES[i]})
			if [ $? -ne 0 ]; then
				echo >&2 "${TARGET_DEVSIZES[i]}"
				return 1
			fi

			# Get the real device name
			TARGET_DEVNAMES[i]=$(get_realdevname ${host_name} \
					     ${TARGET_DEVNAMES[i]})
			if [ $? -ne 0 ]; then
				echo >&2 "${TARGET_DEVNAMES[i]}"
				return 1
			fi
		fi
        done

	return 0
}

# is_target target_svtype ldd_flags
# Check the service type of a lustre target
is_target() {
	case "$1" in
	"mdt") let "ret = $2 & LDD_F_SV_TYPE_MDT";;
	"ost") let "ret = $2 & LDD_F_SV_TYPE_OST";;
	"mgs") let "ret = $2 & LDD_F_SV_TYPE_MGS";;
	"*") 
		echo >&2 "`basename $0`: is_target() error: Invalid" \
		"target service type - \"$1\"!"
		return 1
		;;
	esac

	if [ ${ret} -eq 0 ]; then
		return 1
	fi

	return 0
}

# get_devtype ldd_flags
# Get the service type of a lustre target from @ldd_flags
get_devtype() {
	local target_devtype=

	if [ -z "${flags}" ]; then
		echo "`basename $0`: get_devtype() error: Invalid" \
			"ldd_flags - it's value is null!"
		return 1
	fi

	if is_target "mgs" $1; then
		if is_target "mdt" $1; then
			target_devtype="mgs|mdt"
		else
			target_devtype="mgs"
		fi
	elif is_target "mdt" $1; then
		target_devtype="mdt"
	elif is_target "ost" $1; then
		target_devtype="ost"
	else
		echo "`basename $0`: get_devtype() error: Invalid" \
		"ldd_flags - \"$1\"!"
		return 1
	fi

	echo ${target_devtype}
	return 0
}

# get_mntopts ldd_mount_opts
# Get the user-specified lustre target mount options from @ldd_mount_opts
get_mntopts() {
	local mount_opts=
	local ldd_mount_opts=$1

	mount_opts="${ldd_mount_opts#${ALWAYS_MNTOPTS}}"
	mount_opts="${mount_opts#${MDT_MGS_ALWAYS_MNTOPTS}}"
	mount_opts="${mount_opts#${OST_ALWAYS_MNTOPTS}}"
	mount_opts="${mount_opts#${OST_DEFAULT_MNTOPTS}}"
	mount_opts="`echo \"${mount_opts}\" | sed 's/^,//'`"

	[ "${mount_opts}" != "${mount_opts#*,*}" ] && echo "\""${mount_opts}"\"" \
	|| echo ${mount_opts}

	return 0
}

# get_mgsnids ldd_params
# Get the mgs nids of lustre target from @ldd_params
get_mgsnids() {
	local mgs_nids=		# mgs nids in one mgs node
	local all_mgs_nids=	# mgs nids in all mgs failover nodes
	local param=
	local ldd_params="$*"

	for param in ${ldd_params}; do
		if [ -n "`echo ${param}|awk '/mgsnode=/ {print $0}'`" ]; then
			mgs_nids=`echo ${param#${PARAM_MGSNODE}}`

			if [ -n "${all_mgs_nids}" ]; then
				all_mgs_nids=${all_mgs_nids}:${mgs_nids}
			else
				all_mgs_nids=${mgs_nids}
			fi
		fi
	done

	[ "${all_mgs_nids}" != "${all_mgs_nids#*,*}" ] \
	&& echo "\""${all_mgs_nids}"\"" || echo ${all_mgs_nids}

	return 0
}

# get_failnids ldd_params
# Get the failover nids of lustre target from @ldd_params
get_failnids() {
	local fail_nids=	# failover nids in one failover node
	local all_fail_nids=	# failover nids in all failover nodes
				# of this target
	local param=
	local ldd_params="$*"

	for param in ${ldd_params}; do
		if [ -n "`echo ${param}|awk '/failover.node=/ {print $0}'`" ]; then
			fail_nids=`echo ${param#${PARAM_FAILNODE}}`

			if [ -n "${all_fail_nids}" ]; then
				all_fail_nids=${all_fail_nids}:${fail_nids}
			else
				all_fail_nids=${fail_nids}
			fi
		fi
	done

	[ "${all_fail_nids}" != "${all_fail_nids#*,*}" ] \
	&& echo "\""${all_fail_nids}"\"" || echo ${all_fail_nids}

	return 0
}

# get_fmtopts target_devname hostname ldd_params
# Get other format options of the lustre target @target_devname from @ldd_params
get_fmtopts() {
	local target_devname=$1
	local host_name=$2
	shift
	shift
	local ldd_params="$*"
	local param= 
	local fmt_opts=

	for param in ${ldd_params}; do
		[ -n "`echo ${param}|awk '/mgsnode=/ {print $0}'`" ] && continue
		[ -n "`echo ${param}|awk '/failover.node=/ {print $0}'`" ] && continue

		if [ -n "${param}" ]; then
			if [ -n "${fmt_opts}" ]; then
				fmt_opts=${fmt_opts}" --param=\""${param}"\""
			else
				fmt_opts="--param=\""${param}"\""
			fi
		fi
	done

	echo ${fmt_opts}
	return 0
}

# get_stripecount host_name target_fsname
# Get the stripe count for @target_fsname
get_stripecount() {
	local host_name=$1
	local target_fsname=$2
	local stripe_count=
	local stripecount_file
	local ret_str

	# Get the stripe count
	stripecount_file=${LUSTRE_PROC}/lov/${target_fsname}-mdtlov/stripecount
	ret_str=`${REMOTE} ${host_name} "cat ${stripecount_file}" 2>&1`
	if [ $? -ne 0 -a -n "${ret_str}" ]; then
		echo "`basename $0`: get_stripecount() error:" \
		"remote command to ${host_name} error: ${ret_str}"
		return 1
	fi

	if is_pdsh; then
		stripe_count=`echo ${ret_str} | awk '{print $2}'`
	else
		stripe_count=`echo ${ret_str} | awk '{print $1}'`
	fi

	if [ -z "`echo ${stripe_count}|awk '/^[[:digit:]]/ {print $0}'`" ]
	then
		echo "`basename $0`: get_stripecount() error: can't" \
		"get stripe count of ${target_fsname} in ${host_name}!"
		return 1
	fi

	echo ${stripe_count}
	return 0
}

# get_stripecount_opt host_name target_fsname
# Get the stripe count option for lustre mdt target
get_stripecount_opt() {
	local host_name=$1
	local target_fsname=$2
	local stripe_count=
	local stripecount_opt=

	# Get the stripe count
	[ -z "${target_fsname}" ] && target_fsname="lustre"
	stripe_count=$(get_stripecount ${host_name} ${target_fsname})
	if [ $? -ne 0 ]; then
		echo "${stripe_count}"
		return 1
	fi
	
	if [ "${stripe_count}" != "1" ]; then
		stripecount_opt=${OPTSTR_STRIPE_COUNT}${stripe_count}
	fi

	echo ${stripecount_opt}
	return 0
}

# get_ldds hostname
# Get the lustre target disk data from the node @hostname
get_ldds(){
	declare -i i
	local host_name=$1
	local ret_line line
	local flags mnt_opts params
	local stripecount_opt

        # Initialize the arrays
	unset TARGET_DEVTYPES TARGET_FSNAMES TARGET_MGSNIDS TARGET_INDEXES
	unset TARGET_FMTOPTS  TARGET_MNTOPTS TARGET_FAILNIDS
	
	# Get lustre target device type, fsname, index, etc.
	# from MOUNT_DATA_FILE. Using tunefs.lustre to read it.
	for ((i = 0; i < ${#TARGET_DEVNAMES[@]}; i++)); do
		flags=
		mnt_opts=
		params=
		stripecount_opt=
		[ -z "${TARGET_DEVNAMES[i]}" ] && continue

		# Execute remote command to read MOUNT_DATA_FILE
		while read -r ret_line; do
			if is_pdsh; then
                		set -- ${ret_line}
				shift
				line="$*"
			else
				line="${ret_line}"
			fi

			if [ -n "`echo ${line}|awk '/Index:/ {print $0}'`" ]; then
				TARGET_INDEXES[i]=`echo ${line}|awk '{print $2}'`
				continue
			fi

			if [ -n "`echo ${line}|awk '/Lustre FS:/ {print $0}'`" ]; then
				TARGET_FSNAMES[i]=`echo ${line}|awk '{print $3}'`
				continue
			fi
			
			if [ -n "`echo ${line}|awk '/Flags:/ {print $0}'`" ]; then
				flags=`echo ${line}|awk '{print $2}'`
				continue
			fi

			if [ -n "`echo ${line}|awk '/Persistent mount opts:/ {print $0}'`" ]; then
				mnt_opts=`echo ${line}|awk '{print $0}'`
				mnt_opts=`echo ${mnt_opts#Persistent mount opts: }`
				continue
			fi

			if [ -n "`echo ${line}|awk '/Parameters:/ {print $0}'`" ]; then
				params=`echo ${line}|awk '{print $0}'`
				params=`echo ${params#Parameters:}`
				break
			fi
        	done < <(${REMOTE} ${host_name} "${TUNEFS} --print --verbose ${TARGET_DEVNAMES[i]} 2>/dev/null")

		if [ -z "${flags}" ]; then
			echo >&2 "`basename $0`: get_ldds() error: Invalid" \
				 "ldd_flags of target ${TARGET_DEVNAMES[i]}" \
				 "in host ${host_name} - it's value is null!"\
				 "Check ${TUNEFS} command!"
			return 1
		fi
		
		if [ "${TARGET_INDEXES[i]}" = "unassigned" ] \
		|| is_target "mgs" ${flags}; then
			TARGET_INDEXES[i]=
		fi

		[ "${TARGET_FSNAMES[i]}" = "lustre" ] && TARGET_FSNAMES[i]=

		# Get the lustre target service type
		TARGET_DEVTYPES[i]=$(get_devtype ${flags})
		if [ $? -ne 0 ]; then
			echo >&2 "${TARGET_DEVTYPES[i]} From device" \
			"${TARGET_DEVNAMES[i]} in host ${host_name}!"
			return 1
		fi

		# Get the lustre target mount options
		TARGET_MNTOPTS[i]=$(get_mntopts "${mnt_opts}")

		# Get mgs nids of the lustre target
		TARGET_MGSNIDS[i]=$(get_mgsnids "${params}")

		# Get failover nids of the lustre target
		TARGET_FAILNIDS[i]=$(get_failnids "${params}")
		if [ $? -ne 0 ]; then
			echo >&2 "${TARGET_FAILNIDS[i]} From device" \
			"${TARGET_DEVNAMES[i]} in host ${host_name}!"
			return 1
		fi

		# Get other format options of the lustre target
		TARGET_FMTOPTS[i]=$(get_fmtopts ${TARGET_DEVNAMES[i]} ${host_name} "${params}")
		if [ $? -ne 0 ]; then
			echo >&2 "${TARGET_FMTOPTS[i]}"
			return 1
		fi

		if [ -n "${TARGET_DEVSIZES[i]}" ]; then
			if [ -n "${TARGET_FMTOPTS[i]}" ]; then
				TARGET_FMTOPTS[i]="--device-size=${TARGET_DEVSIZES[i]} ""${TARGET_FMTOPTS[i]}"
			else
				TARGET_FMTOPTS[i]="--device-size=${TARGET_DEVSIZES[i]}"
			fi
		fi

		if [ -n "${FAILOVER_FMTOPTS[i]}" ]; then
			if [ -n "${TARGET_FMTOPTS[i]}" ]; then
				TARGET_FMTOPTS[i]=${TARGET_FMTOPTS[i]}" "${FAILOVER_FMTOPTS[i]}
			else
				TARGET_FMTOPTS[i]=${FAILOVER_FMTOPTS[i]}
			fi
		fi

		if is_target "mdt" ${flags}; then
			# Get the stripe count option
			stripecount_opt=$(get_stripecount_opt ${host_name} ${TARGET_FSNAMES[i]})
			if [ $? -ne 0 ]; then
				echo >&2 "${stripecount_opt}"
				return 1
			fi

			if [ -n "${stripecount_opt}" ]; then
				if [ -n "${TARGET_FMTOPTS[i]}" ]; then
					TARGET_FMTOPTS[i]=${TARGET_FMTOPTS[i]}" "${stripecount_opt}
				else
					TARGET_FMTOPTS[i]=${stripecount_opt}
				fi
			fi
		fi

		if [ "${TARGET_FMTOPTS[i]}" != "${TARGET_FMTOPTS[i]#*,*}" ]; then
			TARGET_FMTOPTS[i]="\""${TARGET_FMTOPTS[i]}"\""
		fi
        done

	return 0
}

# get_journalsize target_devname hostname
# Get the journal size of lustre target @target_devname from @hostname
get_journalsize() {
	local target_devname=$1
	local host_name=$2
	local journal_inode= 
	local journal_size=
	local ret_str

	# Execute remote command to get the journal inode number
	ret_str=`${REMOTE} ${host_name} "/sbin/debugfs -R 'stats -h' \
		 ${target_devname} | grep 'Journal inode:'" 2>&1`
	if [ $? -ne 0 -a -n "${ret_str}" ]; then
		echo "`basename $0`: get_journalsize() error:" \
		     "remote command error: ${ret_str}"
		return 1
	fi

	ret_str=${ret_str#${ret_str%Journal inode:*}}
	journal_inode=`echo ${ret_str} | awk '{print $3}'`
	if [ -z "`echo ${journal_inode}|awk '/^[[:digit:]]/ {print $0}'`" ]
	then
		echo "`basename $0`: get_journalsize() error: can't" \
		"get journal inode of ${target_devname} in ${host_name}!"
		return 1
	fi

	# Execute remote command to get the journal size
	ret_str=`${REMOTE} ${host_name} "/sbin/debugfs -R \
		'stat <${journal_inode}>' ${target_devname}|grep '^User:'" 2>&1`
	if [ $? -ne 0 -a -n "${ret_str}" ]; then
		echo "`basename $0`: get_journalsize() error:" \
		     "remote command error: ${ret_str}"
		return 1
	fi

	ret_str=${ret_str#${ret_str%User:*}}
	journal_size=`echo ${ret_str} | awk '{print $6}'`
	if [ -z "`echo ${journal_size}|awk '/^[[:digit:]]/ {print $0}'`" ]
	then
		echo "`basename $0`: get_journalsize() error: can't" \
		"get journal size of ${target_devname} in ${host_name}!"
		return 1
	fi

	let "journal_size /= 1024*1024" # MB

	echo ${journal_size}
	return 0
}

# get_defaultjournalsize target_devsize
# Calculate the default journal size from target device size @target_devsize
get_defaultjournalsize() {
	declare -i target_devsize=$1
	declare -i journal_size=0 
	declare -i max_size base_size 

	let "base_size = 1024*1024"
	if [ ${target_devsize} -gt ${base_size} ]; then  # 1GB
		let "journal_size = target_devsize / 102400"
		let "journal_size *= 4"
	fi

	let "max_size = 102400 * L_BLOCK_SIZE"
	let "max_size >>= 20" # 400MB

	if [ ${journal_size} -gt ${max_size} ]; then
		let "journal_size = max_size"
	fi

	echo ${journal_size}
	return 0
}

# figure_journal_size target_devname hostname
# Find a reasonable journal file size given the number of blocks 
# in the filesystem. This algorithm is derived from figure_journal_size()
# function in util.c of e2fsprogs-1.38.cfs2-1.src.rpm.
figure_journal_size() {
	local target_devname=$1
	local host_name=$2
	local ret_str
	declare -i block_count
	declare -i journal_blocks
	declare -i journal_size

	# Execute remote command to get the block count 
	ret_str=`${REMOTE} ${host_name} "/sbin/debugfs -R 'stats -h' \
		 ${target_devname} | grep 'Block count:'" 2>&1`
	if [ $? -ne 0 -a -n "${ret_str}" ]; then
		echo "`basename $0`: figure_journal_size() error:" \
		     "remote command error: ${ret_str}"
		return 1
	fi

	ret_str=${ret_str#${ret_str%Block count:*}}
	block_count=`echo ${ret_str} | awk '{print $3}'`
	if [ -z "`echo ${block_count}|awk '/^[[:digit:]]/ {print $0}'`" ]
	then
		echo "`basename $0`: figure_journal_size() error: can't" \
		"get block count of ${target_devname} in ${host_name}!"
		return 1
	fi

	if ((block_count < 32768)); then
		let "journal_blocks = 1024"
	elif ((block_count < 256*1024)); then
		let "journal_blocks = 4096"
	elif ((block_count < 512*1024)); then
		let "journal_blocks = 8192"
	elif ((block_count < 1024*1024)); then
		let "journal_blocks = 16384"
	else
		let "journal_blocks = 32768"
	fi

	let "journal_size = journal_blocks * L_BLOCK_SIZE / 1048576"

	echo ${journal_size}
	return 0
}

# get_J_opt hostname target_devname target_devsize
# Get the mkfs -J option of lustre target @target_devname 
# from the node @hostname
get_J_opt() {
	local host_name=$1
	local target_devname=$2
	local target_devsize=$3
	local journal_size=
	local default_journal_size=
	local journal_opt=

	# Get the real journal size of lustre target
	journal_size=$(get_journalsize ${target_devname} ${host_name})
	if [ $? -ne 0 ]; then
		echo "${journal_size}"
		return 1
	fi

	# Get the default journal size of lustre target
	default_journal_size=$(get_defaultjournalsize ${target_devsize})
	if [ "${default_journal_size}" = "0" ]; then
		default_journal_size=$(figure_journal_size ${target_devname} \
				       ${host_name})
		if [ $? -ne 0 ]; then
			echo "${default_journal_size}"
			return 1
		fi
	fi

	if [ "${journal_size}" != "${default_journal_size}" ]; then
		journal_opt="-J size=${journal_size}"
	fi
		
	echo ${journal_opt}
	return 0
}

# get_ratio target_devname hostname
# Get the bytes/inode ratio of lustre target @target_devname from @hostname
get_ratio() {
	local target_devname=$1
	local host_name=$2
	local inode_count= 
	local block_count=
	local ratio=
	local ret_str

	# Execute remote command to get the inode count
	ret_str=`${REMOTE} ${host_name} "/sbin/debugfs -R 'stats -h' \
		 ${target_devname} | grep 'Inode count:'" 2>&1`
	if [ $? -ne 0 -a -n "${ret_str}" ]; then
		echo "`basename $0`: get_ratio() error:" \
		     "remote command error: ${ret_str}"
		return 1
	fi

	ret_str=${ret_str#${ret_str%Inode count:*}}
	inode_count=`echo ${ret_str} | awk '{print $3}'`
	if [ -z "`echo ${inode_count}|awk '/^[[:digit:]]/ {print $0}'`" ]
	then
		echo "`basename $0`: get_ratio() error: can't" \
		"get inode count of ${target_devname} in ${host_name}!"
		return 1
	fi

	# Execute remote command to get the block count
	ret_str=`${REMOTE} ${host_name} "/sbin/debugfs -R 'stats -h' \
		 ${target_devname} | grep 'Block count:'" 2>&1`
	if [ $? -ne 0 -a -n "${ret_str}" ]; then
		echo "`basename $0`: get_ratio() error:" \
		     "remote command error: ${ret_str}"
		return 1
	fi

	ret_str=${ret_str#${ret_str%Block count:*}}
	block_count=`echo ${ret_str} | awk '{print $3}'`
	if [ -z "`echo ${block_count}|awk '/^[[:digit:]]/ {print $0}'`" ]
	then
		echo "`basename $0`: get_ratio() error: can't" \
		"get block count of ${target_devname} in ${host_name}!"
		return 1
	fi

	let "ratio = block_count*L_BLOCK_SIZE/inode_count"

	echo ${ratio}
	return 0
}

# get_default_ratio target_devtype target_devsize
# Calculate the default bytes/inode ratio from target type @target_devtype
get_default_ratio() {
	local target_devtype=$1
	declare -i target_devsize=$2
	local ratio=

	case "${target_devtype}" in
	"mdt" | "mgs|mdt" | "mdt|mgs")
		ratio=4096;;
	"ost")
		[ ${target_devsize} -gt 1000000 ] && ratio=16384;;
	esac

	[ -z "${ratio}" ] && ratio=${L_BLOCK_SIZE}

	echo ${ratio}
	return 0
}

# get_i_opt hostname target_devname target_devtype target_devsize
# Get the mkfs -i option of lustre target @target_devname 
# from the node @hostname
get_i_opt() {
	local host_name=$1
	local target_devname=$2
	local target_devtype=$3
	local target_devsize=$4
	local ratio=
	local default_ratio=
	local ratio_opt=

	# Get the real bytes/inode ratio of lustre target
	ratio=$(get_ratio ${target_devname} ${host_name})
	if [ $? -ne 0 ]; then
		echo "${ratio}"
		return 1
	fi

	# Get the default bytes/inode ratio of lustre target
	default_ratio=$(get_default_ratio ${target_devtype} ${target_devsize})

	if [ "${ratio}" != "${default_ratio}" ]; then
		ratio_opt="-i ${ratio}"
	fi
		
	echo ${ratio_opt}
	return 0
}

# get_isize target_devname hostname
# Get the inode size of lustre target @target_devname from @hostname
get_isize() {
	local target_devname=$1
	local host_name=$2
	local inode_size= 
	local ret_str

	# Execute remote command to get the inode size 
	ret_str=`${REMOTE} ${host_name} "/sbin/debugfs -R 'stats -h' \
		 ${target_devname} | grep 'Inode size:'" 2>&1`
	if [ $? -ne 0 -a -n "${ret_str}" ]; then
		echo "`basename $0`: get_isize() error:" \
		     "remote command error: ${ret_str}"
		return 1
	fi

	ret_str=${ret_str#${ret_str%Inode size:*}}
	inode_size=`echo ${ret_str} | awk '{print $3}'`
	if [ -z "`echo ${inode_size}|awk '/^[[:digit:]]/ {print $0}'`" ]
	then
		echo "`basename $0`: get_isize() error: can't" \
		"get inode size of ${target_devname} in ${host_name}!"
		return 1
	fi

	echo ${inode_size}
	return 0
}

# get_mdt_default_isize host_name target_fsname
# Calculate the default inode size of lustre mdt target
get_mdt_default_isize() {
	local host_name=$1
	local target_fsname=$2
	declare -i stripe_count
	local inode_size=

	# Get the stripe count
	stripe_count=$(get_stripecount ${host_name} ${target_fsname})
	if [ $? -ne 0 ]; then
		echo "${stripe_count}"
		return 1
	fi

	if ((stripe_count > 77)); then
		inode_size=512
	elif ((stripe_count > 34)); then
		inode_size=2048
	elif ((stripe_count > 13)); then
		inode_size=1024
	else
		inode_size=512
	fi

	echo ${inode_size}
	return 0
}

# get_default_isize host_name target_devtype target_fsname
# Calculate the default inode size of lustre target type @target_devtype
get_default_isize() {
	local host_name=$1
	local target_devtype=$2
	local target_fsname=$3
	local inode_size=

	case "${target_devtype}" in
	"mdt" | "mgs|mdt" | "mdt|mgs")
		inode_size=$(get_mdt_default_isize ${host_name} ${target_fsname})
		if [ $? -ne 0 ]; then
			echo "${inode_size}"
			return 1
		fi
		;;
	"ost")
		inode_size=256;;
	esac

	[ -z "${inode_size}" ] && inode_size=128

	echo ${inode_size}
	return 0
}

# get_I_opt hostname target_devname target_devtype target_fsname
# Get the mkfs -I option of lustre target @target_devname 
# from the node @hostname
get_I_opt() {
	local host_name=$1
	local target_devname=$2
	local target_devtype=$3
	local target_fsname=$4
	local isize=
	local default_isize=
	local isize_opt=

	# Get the real inode size of lustre target
	isize=$(get_isize ${target_devname} ${host_name})
	if [ $? -ne 0 ]; then
		echo "${isize}"
		return 1
	fi

	# Get the default inode size of lustre target
	[ -z "${target_fsname}" ] && target_fsname="lustre"
	default_isize=$(get_default_isize ${host_name} ${target_devtype} \
			${target_fsname})
	if [ $? -ne 0 ]; then
		echo "${default_isize}"
		return 1
	fi

	if [ "${isize}" != "${default_isize}" ]; then
		isize_opt="-I ${isize}"
	fi
		
	echo ${isize_opt}
	return 0
}

# get_mkfsopts hostname
# Get the mkfs options of lustre targets from the node @hostname
get_mkfsopts(){
	declare -i i
	local host_name=$1
	local journal_opt
	local ratio_opt
	local inode_size_opt

        # Initialize the arrays
	unset TARGET_MKFSOPTS
	
	# FIXME: Get other mkfs options of ext3/ldiskfs besides -J, -i and -I
	for ((i = 0; i < ${#TARGET_DEVNAMES[@]}; i++)); do
		journal_opt=
		ratio_opt=
		inode_size_opt=

		[ -z "${TARGET_DEVNAMES[i]}" ] && continue

		if [ -z "${TARGET_DEVSIZES[i]}" ]; then
			# Get the device size
			TARGET_DEVSIZES[i]=$(get_devsize ${host_name} \
				         ${TARGET_DEVNAMES[i]})
			if [ $? -ne 0 ]; then
				echo >&2 "${TARGET_DEVSIZES[i]}"
				return 1
			fi
		fi

		# Get the journal option
		journal_opt=$(get_J_opt ${host_name} ${TARGET_DEVNAMES[i]} \
			      ${TARGET_DEVSIZES[i]})
		if [ $? -ne 0 ]; then
			echo >&2 "${journal_opt}"
			return 1
		fi

		if [ -n "${journal_opt}" ]; then
			if [ -z "${TARGET_MKFSOPTS[i]}" ]; then
				TARGET_MKFSOPTS[i]="${journal_opt}"
			else
				TARGET_MKFSOPTS[i]=${TARGET_MKFSOPTS[i]}" ${journal_opt}"
			fi
		fi
		
		# Get the bytes-per-inode ratio option
		ratio_opt=$(get_i_opt ${host_name} ${TARGET_DEVNAMES[i]} \
			    ${TARGET_DEVTYPES[i]} ${TARGET_DEVSIZES[i]})
		if [ $? -ne 0 ]; then
			echo >&2 "${ratio_opt}"
			return 1
		fi

		if [ -n "${ratio_opt}" ]; then
			if [ -z "${TARGET_MKFSOPTS[i]}" ]; then
				TARGET_MKFSOPTS[i]="${ratio_opt}"
			else
				TARGET_MKFSOPTS[i]=${TARGET_MKFSOPTS[i]}" ${ratio_opt}"
			fi
		fi

		# Get the inode size option
		inode_size_opt=$(get_I_opt ${host_name} ${TARGET_DEVNAMES[i]} \
				 ${TARGET_DEVTYPES[i]} ${TARGET_FSNAMES[i]})
		if [ $? -ne 0 ]; then
			echo >&2 "${inode_size_opt}"
			return 1
		fi

		if [ -n "${inode_size_opt}" ]; then
			if [ -z "${TARGET_MKFSOPTS[i]}" ]; then
				TARGET_MKFSOPTS[i]="${inode_size_opt}"
			else
				TARGET_MKFSOPTS[i]=${TARGET_MKFSOPTS[i]}" ${inode_size_opt}"
			fi
		fi

		if [ "${TARGET_MKFSOPTS[i]}" != "${TARGET_MKFSOPTS[i]#*,*}" ]; then
			TARGET_MKFSOPTS[i]="\""${TARGET_MKFSOPTS[i]}"\""
		fi
	done
	return 0
}

# get_target_configs hostname
# Get the lustre target informations from the node @hostname
get_target_configs() {
	declare -i i
	local host_name=$1
	local ret_line line

        # Initialize the arrays
	unset TARGET_CONFIGS

	# Get lustre target server names
	if ! get_svnames ${host_name}; then
		return 1
	fi

	# Get lustre target device names, mount points and loop device sizes
	if ! get_devnames ${host_name}; then
		return 1
	fi

	# Get lustre target device type, fsname, index, etc.
	if ! get_ldds ${host_name}; then
		return 1
	fi

	# Get mkfs options of lustre targets
	if ! get_mkfsopts ${host_name}; then
		return 1
	fi

	# Construct lustre target configs
	for ((i = 0; i < ${#TARGET_DEVNAMES[@]}; i++)); do
		[ -z "${TARGET_DEVNAMES[i]}" ] && continue
		TARGET_CONFIGS[i]=${TARGET_DEVNAMES[i]},${TARGET_MNTPNTS[i]},${TARGET_DEVTYPES[i]},${TARGET_FSNAMES[i]},${TARGET_MGSNIDS[i]},${TARGET_INDEXES[i]},${TARGET_FMTOPTS[i]},${TARGET_MKFSOPTS[i]},${TARGET_MNTOPTS[i]},${TARGET_FAILNIDS[i]}
	done

	return 0
}

# get_configs hostname
# Get all the informations needed to generate a csv file from 
# the node @hostname
get_configs() {
	# Check the hostname
	if [ -z "$1" ]; then
		echo >&2 "`basename $0`: get_configs() error:" \
			 "Missing hostname!"
		return 1
	fi

	# Get network module options
	verbose_output ""
	verbose_output "Collecting network module options from host $1..."
	if ! get_module_opts $1; then
		return 1
	fi
	verbose_output "OK"

	# Get lustre target informations
	verbose_output "Collecting Lustre targets informations from host $1..."
	if ! get_target_configs $1; then
		return 1
	fi
	verbose_output "OK"

	# Get HA software configurations
	if ! get_ha_configs $1; then
		return 1
	fi

	return 0
}

# Collect linux MD/LVM device informations from the lustre cluster and
# append them to the csv file
get_mdlvm_info() {
	declare -i idx
	declare -i i
	local line

	# Collect and append linux MD/LVM informations to the csv file
	for ((idx = 0; idx < ${#HOST_NAMES[@]}; idx++)); do
		[ -z "${HOST_NAMES[idx]}" ] && continue

		# Collect MD device informations
		! get_md_configs ${HOST_NAMES[idx]} && return 1

		# Append MD device informations to the csv file
		for ((i = 0; i < ${#MD_NAME[@]}; i++)); do
			line=${HOST_NAMES[idx]},${MD_MARKER},${MD_NAME[i]},,,${MD_LEVEL[i]},${MD_DEVS[i]}
			verbose_output "Informations of MD device ${MD_NAME[i]}" \
				       "in host ${HOST_NAMES[idx]} are as follows:"
			verbose_output "${line}"
			echo "${line}" >> ${LUSTRE_CSV_FILE}
		done

		# Collect PV informations
		! get_pv_configs ${HOST_NAMES[idx]} && return 1

		# Append PV informations to the csv file
		if [ -n "${PV_NAMES}" ]; then
			line=${HOST_NAMES[idx]},${PV_MARKER},${PV_NAMES}
			verbose_output "Informations of PVs" \
				       "in host ${HOST_NAMES[idx]} are as follows:"
			verbose_output "${line}"
			echo "${line}" >> ${LUSTRE_CSV_FILE}
		fi

		# Collect VG informations
		! get_vg_configs ${HOST_NAMES[idx]} && return 1

		# Append VG informations to the csv file
		for ((i = 0; i < ${#VG_NAME[@]}; i++)); do
			line=${HOST_NAMES[idx]},${VG_MARKER},${VG_NAME[i]},,,${VG_PVNAMES[i]}
			verbose_output "Informations of VG ${VG_NAME[i]}" \
				       "in host ${HOST_NAMES[idx]} are as follows:"
			verbose_output "${line}"
			echo "${line}" >> ${LUSTRE_CSV_FILE}
		done

		# Collect LV informations
		! get_lv_configs ${HOST_NAMES[idx]} && return 1

		# Append LV informations to the csv file
		for ((i = 0; i < ${#LV_NAME[@]}; i++)); do
			line=${HOST_NAMES[idx]},${LV_MARKER},${LV_NAME[i]},,,${LV_SIZE[i]},${LV_VGNAME[i]}
			verbose_output "Informations of LV /dev/${LV_VGNAME[i]}/${LV_NAME[i]}"\
				       "in host ${HOST_NAMES[idx]} are as follows:"
			verbose_output "${line}"
			echo "${line}" >> ${LUSTRE_CSV_FILE}
		done
	done
	return 0
}

# Generate the csv file from the lustre cluster
gen_csvfile() {
	declare -i idx
	declare -i i
	local line

	# Get lustre cluster node names
	verbose_output "Collecting Lustre cluster node names..."
	if ! get_hostnames; then
		return 1
	fi
	verbose_output "OK"

	: > ${LUSTRE_CSV_FILE}

	${GET_MDLVM_INFO} && get_mdlvm_info

	# Collect and append lustre target informations to the csv file
	for ((idx = 0; idx < ${#HOST_NAMES[@]}; idx++)); do
		# Collect informations
		if ! get_configs ${HOST_NAMES[idx]}; then
			rm -f ${LUSTRE_CSV_FILE}
			return 1
		fi

		# Append informations to the csv file
		for ((i = 0; i < ${#TARGET_DEVNAMES[@]}; i++)); do
			[ -z "${TARGET_DEVNAMES[i]}" ] && continue

			if [ -z "${HA_CONFIGS[i]}" ]; then
				line=${HOST_NAMES[idx]},${MODULE_OPTS},${TARGET_CONFIGS[i]}
			else
				line=${HOST_NAMES[idx]},${MODULE_OPTS},${TARGET_CONFIGS[i]},${HA_CONFIGS[i]}
			fi
			verbose_output "Informations of target ${TARGET_DEVNAMES[i]}" \
				       "in host ${HOST_NAMES[idx]} are as follows:"
			verbose_output "${line}"
			echo "" >> ${LUSTRE_CSV_FILE}
			echo "${line}" >> ${LUSTRE_CSV_FILE}
		done
    	done

	return 0
}

# Main flow
echo "`basename $0`: ******** Generate csv file -- ${LUSTRE_CSV_FILE} START ********"
if ! gen_csvfile; then
	exit 1
fi
echo "`basename $0`: ******** Generate csv file -- ${LUSTRE_CSV_FILE} OK **********"

exit 0