How to fix the Oracle error ORA-15003: diskgroup “string” already mounted in another lock name space?

In this post, you’ll learn more about the Oracle ErrorORA-15003: diskgroup “string” already mounted in another lock name space with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-15003: diskgroup “string” already mounted in another lock name space

Reason for the Error ORA-15003: diskgroup “string” already mounted in another lock name space

The diskgroup could not be mounted by the ASM instance because it was operating in a lockspace different than another existing ASM instance which had already mounted the diskgroup.

How to fix the Error ORA-15003: diskgroup “string” already mounted in another lock name space ?

You can fix this error in Oracle by following the below steps

Check the LOCK_NAME_SPACE initialization parameter value, or dismount the diskgroup from the other ASM instances.

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