Rename ASM diskgroup
First, check there should not be any running transactions going on the diskgroup you are going to rename.
Dismount the DISKGROUP to be renamed on all the nodes
Run renamedg check for checking, it will let you know if any other steps needed before actual rename of diskgroup like dismount of diskgroup on another node
renamedg dgname=<old_dgname> newdgname=<new_dgname> verbose=true check=true
Now run the renamedg for renaming the diskgroup
renamedg dgname=<old_dgname> newdgname=<new_dgname> verbose=true
Mount the newly named DISKGROUP
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