Oracle Linux 7: Oracleasm Create Disk Failed "Instantiating disk: failed "

APPLIES TO:

Linux OS - Version Oracle Linux 7.0 and later
Linux x86-64

SYMPTOMS

Oracleasm create disk failure on Oracle Linux 7 with following error. 

#oracleasm createdisk DATA1 /dev/sde1
Writing disk header: done
Instantiating disk: failed <<<<<<<<<<<<<<<<<
Clearing disk header: done

 With Verbose option (-v)

# oracleasm createdisk -v DATA1 /dev/sde1
Disk "DATA1" does not exist or is not instantiated
Writing disk header: done
Instantiating disk: oracleasm-instantiate-disk: Unable to open manager: No such file or directory <<<<<<<<<<<<
failed
Clearing disk header: done

CAUSE

Selinux is enabled
 

SOLUTION

1. Disable Selinux

#setenforce 0
#vi /etc/sysconfig/selinux <<Make it persistent on reboot.
SELINUX=Disabled
:wq

2. Reboot the server and run 'oracleasm createdisk' again