安装客户核心生产数据库，磁盘组名不对，需要删除，重新创建。

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删除磁盘组步骤如下：

su - grid
sqlplus / as sysasm

SQL> select group_number, name from v$asm_diskgroup;

GROUP_NUMBER NAME
------------ --------------------------------------------------
           1 DATADG

SQL> col path for a40
SQL> col name for a40
SQL> set lines 120
SQL> select path, name from v$asm_disk where group_number=1;

PATH                                     NAME
---------------------------------------- ----------------------------------------
/dev/rhdiskpower0                        DATADG_0000
/dev/rhdiskpower1                        DATADG_0001
/dev/rhdiskpower2                        DATADG_0002
/dev/rhdiskpower3                        DATADG_0003
/dev/rhdiskpower4                        DATADG_0004

SQL> 

SQL>  alter diskgroup datadg dismount force;

Diskgroup altered.

SQL> drop diskgroup datadg force including contents;

Diskgroup dropped.

##原有磁盘组名叫DATADG,现在需要改为DATA
# su - grid
$ asmcmd -p
ASMCMD [+] > lsdg
State    Type    Rebal  Sector  Block       AU  Total_MB  Free_MB  Req_mir_free_MB  Usable_file_MB  Offline_disks  Voting_files  Name
MOUNTED  EXTERN  N         512   4096  1048576   1024000  1023928                0         1023928              0             N  DATADG/   
ASMCMD [+] > exit

###删除后发现磁盘组确实不见了哈
$ 
$ asmcmd -p
ASMCMD [+] > lsdg
ASMCMD [+] > exit
$ 
$ 

本文题目：11g删除磁盘组步骤
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