Case 1. Update the patch level on all nodes, As root user

$ clscfg -patch

Example:

# <GRID_HOME>/bin/clscfg -patch
clscfg: -patch mode specified
clscfg: EXISTING configuration version 5 detected.
clscfg: version 5 is 12c Release 1.
Successfully accumulated necessary OCR keys.
Creating OCR keys for user 'root', privgrp 'root'..
Operation successful.

And validate as root user

$ crsctl query crs softwarepatch

Example:

# <GRID_HOME>/bin/crsctl query crs softwarepatch
Oracle Clusterware patch level on node host01 is [1964077727].

# <GRID_HOME>/bin/crsctl query crs softwarepatch
Oracle Clusterware patch level on node host02 is [1964077727].

If both were at same level,stop rolling patch mode from one of the node as root user

$ crsctl stop rollingpatch

Then startup the cluster and create asm diskgroup.

Example:

# <GRID_HOME>/bin/crsctl stop rollingpatch
CRS-1161: The cluster was successfully patched to patch level [1964077727].