Marking disk as an ASM disk FAILED

I ran this command and got the message that the disk does not exist or is not instantiated

/etc/init.d/oracleasm createdisk DISK1 /dev/sdb1
Marking disk "DISK1" as an ASM disk: [FAILED]

I checked for ASM create errors in /var/log/oracleasm and saw this ASM disk error message:

 Disk "DISK1" does not exist or is not instantiated
 Writing disk header: done
 Instantiating disk: oracleasm-instantiate-disk:
 Unable to create ASM disk "DISK1": Permission denied

Solution :
The ASM error - disk does not exist or is not instantiated can be caused by many issues but this is very frequent :
SELINUX isn't disabled.

vi /etc/sysconfig/selinux SELINUX=disabled

Then reboot your system and run getenforce to confirm that SELINUX is disabled:

root> /usr/sbin/getenforce Disable

that's all.