oracle 11gR2 版本开始,可以对已有的磁盘组进行重命名,这个特性目前对我来说,也没看出有多大的好处，磁盘组命名好了，一般就不会去更改它。 以下为具体解释和用法：

1.以下三种方式不可以进行重命名

- the Diskgroup is mounted
- the Diskgroup is being used by CSS
- Diskgroup contains offline disks

2.11gR2之前版本(10g,11gR1) 如果想用这个功能，必须安装选项目

     install 11gR2 SIHA Grid Infrastructure software only

3.命令存放目录

   cd <11gr2 grid home>/bin

   renamedg

4.使用方法 比如我们把dgdata重命名dgdatatest

4.1 先dismount dgdata

     alter diskgroup dgdata dismount;

4.2 renamedg

[grid@zjzxdb1:/grid/app/11.2.0/grid/bin]$renamedg dgdata dgdatatest
NOTE: No asm libraries found in the system

Parsing parameters..
renamedg operation: dgdata dgdatatest
Executing phase 1
Discovering the group
Checking for hearbeat...
Re-discovering the group
Generating configuration file..
Completed phase 1
Executing phase 2
Completed phase 2

4.3 查看结果

SQL> select name,state from v$asm_diskgroup;

NAME                           STATE
------------------------------ -----------
DGDATATEST                     DISMOUNTED
DGRECOVER                      MOUNTED
DGSYSTEM                       MOUNTED

SQL>

SQL> select name,state from v$asm_diskgroup;

NAME                 STATE
-------------------- -----------
DGDATATEST           MOUNTED
DGRECOVER            MOUNTED
DGSYSTEM             MOUNTED

SQL>  select name,path from v$asm_disk;

NAME                 PATH
-------------------- --------------------
DGDATA_0000          /dev/rhdisk10
DGSYSTEM_0000        /dev/rhdisk2
DGSYSTEM_0001        /dev/rhdisk3
DGRECOVER_0000       /dev/rhdisk4
DGRECOVER_0001       /dev/rhdisk5
DGDATA_0001          /dev/rhdisk6
DGDATA_0002          /dev/rhdisk7
DGDATA_0003          /dev/rhdisk8
DGDATA_0004          /dev/rhdisk9

9 rows selected.

可以看到磁盘组已经命名过来，但asm disk 名还是dgdata。