If Oracle ASMLIB was installed, but not used earlier, you must create disk labels to enable migration of Oracle ASM disk groups to Oracle ASM Filter Driver (Oracle ASMFD) after installing Oracle Grid Infrastructure 12c Release 1 (12.1.0.2).
Oracle recommends that you temporarily move Oracle Cluster Registry (OCR) and voting files to another disk group if one is available, as described in "Migrating Oracle ASM Disk Groups without Oracle Cluster Registry or Voting Files", and migrate the disk group to use Oracle ASMFD. After migrating the disk group to use Oracle ASMFD, move OCR and voting files back to the disk group. You can similarly migrate any other disk groups if they contain OCR or voting files to ensure online migration of all disk groups to Oracle ASMFD.
This section contains the following topics:
"Migrating Oracle ASM Disk Groups without Oracle Cluster Registry or Voting Files"
"Migrating Oracle ASM Disk Groups with Oracle Cluster Registry or Voting Files"
Oracle Clusterware Administration and Deployment Guide for information about replacing Oracle Cluster Registry locations and migrating voting files
Oracle Clusterware Administration and Deployment Guide for information about using CRSCTL commands
Oracle Clusterware Administration and Deployment Guide for information about managing voting files, Oracle Cluster Registry (OCR), and Oracle Local Registry (OLR)
Oracle Real Application Clusters Administration and Deployment Guide for information about SRVCTL commands