oracleasm createdisk failed

[root@NODE1 /]# oracleasm createdisk DISK1 /dev/sdb1

Writing disk header: done
Instantiating disk: failed
Clearing disk header: done

Check the status of oracleasm it should be loaded .

[root@NODE1 /]# oracleasm status
Checking if ASM is loaded: no
Checking if /dev/oracleasm is mounted: no

[root@NODE1 /]# /etc/init.d/oracleasm restart
Dropping Oracle ASMLib disks:                              [  OK  ]
Shutting down the Oracle ASMLib driver:                    [  OK  ]
Initializing the Oracle ASMLib driver:                     [  OK  ]
Scanning the system for Oracle ASMLib disks:               [  OK  ]

[root@NODE1 /]# oracleasm status
Checking if ASM is loaded: yes
Checking if /dev/oracleasm is mounted: yes

[root@NODE1 /]# oracleasm createdisk DISK1 /dev/sdb1
Writing disk header: done
Instantiating disk: done

[root@NODE1 /]# oracleasm scandisks
Reloading disk partitions: done
Cleaning any stale ASM disks...
Scanning system for ASM disks...

[root@NODE1 /]# oracleasm listdisks
DISK1


If still issue persists check the below :

1. SELINUX should be disabled
2. Check the rpms for oracleasm if they are installed correctly

[root@NODE1 /]# cat /etc/selinux/config

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of these two values:
#     targeted - Targeted processes are protected,
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted


[root@NODE1 /]#