list_asm.sh

#!/bin/bash

ora_user=oracle
asm_sid=+ASM
padding=20

function get_dg() {
        asm_disk=$1
        su - ${ora_user} -c "
                export ORACLE_SID=${asm_sid}
                ORAENV_ASK=NO
                . /usr/local/bin/oraenv -s
                sqlplus -s / as sysasm <<- EOF
                set pages 0 lines 100 feedback off
                select name from v\\\$asm_diskgroup
                where group_number=(select group_number from v\\\$asm_disk where path='ORCL:${asm_disk}');
                exit
                EOF
                "
}

## main

if [ "$(whoami)" != "root" ]; then
        echo "Please run this script as root"
        exit
fi

echo
echo "List of ASM disks in the system"
echo "==============================="
echo
printf "%-${padding}s %-${padding}s %s\n" "ASM DISK" "Physical Device" "ASM Diskgroup"
printf "%-${padding}s %-${padding}s %s\n" "--------" "---------------" "-------------"

for asm_disk in $(oracleasm listdisks); do
        p_disk=$(oracleasm querydisk -p ${asm_disk} | egrep '^/dev/' | cut -d ':' -f 1)
        asm_dg=$(get_dg ${asm_disk})
        printf "%-${padding}s %-${padding}s %s\n" ${asm_disk} ${p_disk} ${asm_dg}
done