Script to backup ASM metadata

This script was written by a colleague James Hardaker.
Creates a backup directory if required, works out the ASM SID, renames the previous entry, then loops round backing up the metadata data for each diskgroup. It also lists each file backed up which is quite helpful.
Finally it creates error checking and a log and error file outputs

#!/bin/sh
#
# Date  Version Author          Comments
# 09/06/09      1.1             Initial Version
# 10/06/09      1.2             Added Error Handling
#
#
# Description
# Queries ASM for a list of disk groups and backs up the metadata of each to /app/oracle/backups
# Should be run as the oracle user

# Tunables
###

BACKUPDIR=/app/oracle/backups

###

##########
# Start of functions
#
# asm_metadata - backup the asm metadata
asm_metadata()
{

export ORACLE_SID=`cat /etc/oratab | grep ^+ASM | awk '{FS=":"} {print $1} ' `
export ORACLE_HOME=`cat /etc/oratab | grep ^+ASM | awk '{FS=":"} {print $2} ' `

for DG in `asmcmd ls + | sed 's/\///'`
do
        echo "INFO: Backup of ${DG} diskgroup started at `date`"
        if [ -f ${BACKUPDIR}/asm_metadata_${DG}.bkp ]
        then
                echo "INFO: Moving the file ${BACKUPDIR}/asm_metadata_${DG}.bkp to ${BACKUPDIR}/asm_metadata_${DG}.old"
                cp ${BACKUPDIR}/asm_metadata_${DG}.bkp ${BACKUPDIR}/asm_metadata_${DG}.old 2>/dev/null
                        if [ $? -ne 0 ]
                        then
                                echo "WARN: Unable to backup ${BACKUPDIR}/asm_metadata_${DG}.bkp, will overwrite it anyway"
                        fi
                rm -f ${BACKUPDIR}/asm_metadata_${DG}.bkp 2>/dev/null
        fi
        echo "INFO: Backing up the ${DG} diskgroup to ${BACKUPDIR}/asm_metadata_${DG}.bkp"
        rm ${BACKUPDIR}/asm_metadata_${DG}.err 2>/dev/null
        ${ORACLE_HOME}/bin/asmcmd md_backup -b ${BACKUPDIR}/asm_metadata_${DG}.bkp -g ${DG} 2>${BACKUPDIR}/asm_metadata_${DG}.err
        if [ -s ${BACKUPDIR}/asm_metadata_${DG}.err ]
        then
                echo ""
                echo "WARN: Unable to backup the ${DG} diskgroup to ${BACKUPDIR}/asm_metadata_${DG}.bkp"
                cat ${BACKUPDIR}/asm_metadata_${DG}.err
                echo ""
                ERR=98
        else
                echo "INFO: Backup of ${DG} diskgroup completed at `date`"
        fi
        echo ""
done
}

##########
# End of functions

### Main Program

echo "INFO: ASM Metadata backup started at `date`"
echo ""
echo "INFO: This script is being run as user `/usr/bin/id -un`"
echo ""

# create the backup directory if it does not exist
#

if [ ! -d ${BACKUPDIR} ]
then
        mkdir ${BACKUPDIR} 2>/dev/null
        echo "INFO: Created the directory ${BACKUPDIR} as it did not exist"
        echo ""
                if [ $? -ne 0 ]
                then
                        echo "ERROR: Unable to create the directory ${BACKUPDIR}"
                        exit 99
                fi
fi

# backup the asm metadata
#
ERR=0
asm_metadata

#Finish
#

if [ ${ERR} != 0 ]
then
        echo "ERROR: An error occurred backing up one or more disk groups, see above"
        exit 98
else
        echo "INFO: ASM Metadata backup completed at `date`"
fi

exit

A sample output for part of the DATA datagroup looks like this :-

@diskgroup_set = (
                   {
                     'ATTRINFO' => {
                                     'AU_SIZE' => '8388608',
                                     'DISK_REPAIR_TIME' => '3.6h',
                                     'COMPATIBLE.ASM' => '11.1.0.0.0',
                                     'COMPATIBLE.RDBMS' => '11.1'
                                   },
                     'DISKSINFO' => {
                                      'DATA_0036' => {
                                                       'DATA_0036' => {
                                                                        'TOTAL_MB' => '91136',
                                                                        'FAILGROUP' => 'DATA_0036',
                                                                        'NAME' => 'DATA_0036',
                                                                        'DGNAME' => 'DATA',
                                                                        'PATH' => '/dev/oracle/disk22'
                                                                      }
                                                     },
                                      'DATA_0006' => {
                                                       'DATA_0006' => {
                                                                        'TOTAL_MB' => '91136',
                                                                        'FAILGROUP' => 'DATA_0006',
                                                                        'NAME' => 'DATA_0006',
                                                                        'DGNAME' => 'DATA',
                                                                        'PATH' => '/dev/oracle/disk6'
                                                                      }
                                                     },
                                      'DATA_0069' => {
                                                       'DATA_0069' => {
                                                                        'TOTAL_MB' => '91136',
                                                                        'FAILGROUP' => 'DATA_0069',
                                                                        'NAME' => 'DATA_0069',
                                                                        'DGNAME' => 'DATA',
                                                                        'PATH' => '/dev/oracle/disk87'