ASM disk group

Hi,

Anyone have an idea how to drop a dismount ASM disk group? I can't mount it
and also can't drop it? 

SQL>  select group_number, name, STATE from v$asm_diskgroup;

GROUP_NUMBER NAME                           STATE
------------ ------------------------------ -----------
           1 SUN6130ORACLE1                 MOUNTED
           2 SUN6130ORACLE2                 MOUNTED
           0 ORACLEGROUP1                   DISMOUNTED
           0 FAS980DG1                      DISMOUNTED
           0 ORACLEGROUP2                   DISMOUNTED

SQL> drop  diskgroup ORACLEGROUP1;
drop  diskgroup ORACLEGROUP1
*
ERROR at line 1:
ORA-15039: diskgroup not dropped
ORA-15001: diskgroup "ORACLEGROUP1" does not exist or is not mounted

SQL> alter diskgroup ORACLEGROUP1 mount;
alter diskgroup ORACLEGROUP1 mount
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15024: discovered duplicately numbered ASM disk 0



        Best Regards,
        Sarah Chen
        Information Technologies
        Budco - The Dialogue Company


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