ORA-15030: diskgroup name "GIMR" is in use by another diskgroup

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How to recreate GIMR diskgroup oracle RAC

CREATE DISKGROUP GIMR

NORMAL REDUNDANCY

SITE S1

FAILGROUP GIMR_S1

DISK 'AFD:DISK1'

SITE S2

FAILGROUP GIMR_S2

DISK 'AFD:DISK2'

ATTRIBUTE

'compatible.asm'='12.1.0.0'

, 'compatible.rdbms'='12.1.0.0';

CREATE DISKGROUP GIMR

*

ERROR at line 1:

ORA-15018: diskgroup cannot be created

ORA-15030: diskgroup name "GIMR" is in use by another diskgroup

Reason: I dropped the disk group GIMR using sqlplus and tried to create it again with the same name ended with above error message 

Solution

Though the diskgroup does not exists I dropped it again using asmcmd . Created the diskgroup again it worked 

ASMCMD> dropdg -r -f GIMR;