CentOS / RHEL 7 : Oracleasm Create Disk Failed “Instantiating disk: failed”

Error:

Oracleasm create disk failure on RHEL 7 with following error.

# oracleasm createdisk DATA1 /dev/sde1

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

Solution

When disk is created with verbose option (-v) you would see :

# 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

This is because the selinux is enables. So to be able to create new disk into oracleasm we will have to disable the selinux first. To do so :
Temporarily disable SElinux

# setenforce 0

Permanently disable SElinux
To disable SElinux permanently edit the SELINUX line in the /etc/sysconfig/selinux file to disabled.

# vi /etc/sysconfig/selinux <

Reboot the server and run 'oracleasm createdisk' again

# shutdonw -r now

For more details on disabling SElinux refer post :