I have created long time back one ASM RAC setup and I created one diskgroup with some name say xyz. I think that instance is gone but the diskgroup was not dropped exclusively using command
drop diskgroup xyz including contents;
Now I have create a new setup and want to re utilize these disks, i am getting below error
CREATE DISKGROUP XYZ EXTERNAL REDUNDANCY DISK ...
ORA-15003: diskgroup "xyz" already mounted in another lock name space
how can this diskgroup be removed? Any help is appreciated.