SQL> drop diskgroup data including contents;
    drop diskgroup data including contents
*
ERROR at line 1:
ORA-15039: diskgroup not dropped
ORA-15073: diskgroup DATA is mounted by another ASM instance

这是报错是因为RAC中其它的实例已经mount了这个磁盘组，在其它实例执行dismount后，重新drop即可

[grid@server02 ~]$ sqlplus / as sysasm

SQL*Plus: Release 19.0.0.0.0 - Production on Wed Oct 27 10:25:07 2021
Version 19.3.0.0.0

Copyright (c) 1982, 2019, Oracle.  All rights reserved.

Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0

SQL> alter diskgroup data dismount;

Diskgroup altered.

[grid@server01 ~]$ sqlplus / as sysasm

SQL*Plus: Release 19.0.0.0.0 - Production on Wed Oct 27 10:30:45 2021
Version 19.3.0.0.0

Copyright (c) 1982, 2019, Oracle.  All rights reserved.

Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0

SQL> drop diskgroup data including contents;

Diskgroup dropped.

如果无法dismount磁盘组，可以使用force选项:

SQL> drop diskgroup data force including contents;

SQL> CREATE DISKGROUP data EXTERNAL  REDUNDANCY DISK
    '/dev/asm-diske' NAME data_0000,
    '/dev/asm-diskf' NAME data_0001
  ATTRIBUTE 'au_size'='4M';

SQL> CREATE DISKGROUP data EXTERNAL  REDUNDANCY DISK
    '/dev/asm-diske' NAME data_0000,
    '/dev/asm-diskf' NAME data_0001
 ATTRIBUTE 'au_size'='4M',
 'compatible.asm' = '19.0',
'compatible.rdbms' = '19.0';
 ---'compatible.advm' = '19.3';