[root@hostname]# /etc/init.d/oracleasm createdisk DATA_0001 /dev/sdb4
Marking disk "DATA_0001" as an ASM disk: [ OK ]
[root@hostname]# /etc/init.d/oracleasm createdisk DATA_0002 /dev/sdb1
Marking disk "DATA_0002" as an ASM disk: [FAILED]
Check the reason in logs: /var/log/oracleasm
Unable to open device "/dev/sdb1": Device or resource busy
Solution:
[root@hostname]# /usr/sbin/asmtool -C -l /dev/oracleasm -n DATA_0002 -s /dev/sdb1 -a force=yes
[root@hostname]# /usr/sbin/asmtool -C -l /dev/oracleasm -n DATA_0003 -s /dev/sdb2 -a force=yes
[root@hostname]# /usr/sbin/asmtool -C -l /dev/oracleasm -n REDO_0001 -s /dev/sdb3 -a force=yes
[root@hostname]# /usr/sbin/asmtool -C -l /dev/oracleasm -n INDX_0001 -s /dev/sdb5 -a force=yes
[root@hostname]# /usr/sbin/asmtool -C -l /dev/oracleasm -n INDX_0002 -s /dev/sdb6 -a force=yes
[root@hostname]# /etc/init.d/oracleasm listdisks
DATA_0001
DATA_0002
DATA_0003
INDX_0001
INDX_0002
REDO_0001
Fixing the Permission:
[root@hostname]# /etc/init.d/oracleasm scandisks
Scanning the system for Oracle ASMLib disks: [ OK ]