ERROR at line 1: ORA-15039: diskgroup not dropped ORA-15073: diskgroup is mounted by another ASM instance

For multiple node RAC servers, the diskgroup must be dismounted from all the other nodes, except the one that we are issuing the command.

SQL> DROP DISKGROUP DATA INCLUDING CONTENTS;

DROP DISKGROUP DATA INCLUDING CONTENTS
*
ERROR at line 1:
ORA-15039: diskgroup not dropped
ORA-15073: diskgroup DATA is mounted by another ASM instance

On Node2, Node3, ….etc

SQL> ALTER DISKGROUP DATA DISMOUNT;

Then on Node1

SQL> DROP DISKGROUP OCRVOTING INCLUDING CONTENTS;

Diskgroup dropped.