Oracle Error ORA-15001: diskgroup “string” does not exist or is not mounted

Oracle Error Message

ORA-15001: diskgroup “string” does not exist or is not mounted

Reason for the Error

An operation failed because the diskgroup specified does not exist or is not mounted by the current ASM instance.

Solution

Verify that the diskgroup name used is valid, that the diskgroup exists, and that the diskgroup is mounted by the current ASM instance.