操作系统版本redhat6.9,数据库版本11.2.0.4；
手工将新增的ASM磁盘添加至ASM磁盘组，发现磁盘组名称写错了！！！如何回退
命令如下 alter diskgroup DATA add disk ‘/dev/oracleasm/disks/DATA009‘ rebalance power 0;
SQL>select group_number,name ,path from v$asm_disk;
GROUP_NUMBER NAME PATH
------------ ------------- ------------------------------
1 ARCH_0003 /dev/oracleasm/disks/ARCH004
1 ARCH_0002 /dev/oracleasm/disks/ARCH003
1 ARCH_0005 /dev/oracleasm/disks/ARCH006
1 ARCH_0004 /dev/oracleasm/disks/ARCH005
1 ARCH_0007 /dev/oracleasm/disks/DATA014
1 ARCH_0006 /dev/oracleasm/disks/DATA013
1 ARCH_0011 /dev/oracleasm/disks/DATA018
1 ARCH_0010 /dev/oracleasm/disks/DATA017
1 ARCH_0009 /dev/oracleasm/disks/DATA016
1 ARCH_0008 /dev/oracleasm/disks/DATA015
······
27 rows selected.
其中存储工程师帮忙提供的存储DATA*是提供给DATA磁盘组使用的，因此存在问题。
删除磁盘命令
alter diskgroup arch drop disk ‘ARCH_0006‘ rebalance power 0; alter diskgroup arch drop disk ‘ARCH_0007‘ rebalance power 0; alter diskgroup arch drop disk ‘ARCH_0008‘ rebalance power 0; alter diskgroup arch drop disk ‘ARCH_0009‘ rebalance power 0; alter diskgroup arch drop disk ‘ARCH_0010‘ rebalance power 0; alter diskgroup arch drop disk ‘ARCH_0011‘ rebalance power 0;
此时删除成功，但是视图查询ARCH磁盘还在！！！需要重平衡。
alter diskgroup arch rebalance power 6;
再次查询视图
SQL>select group_number,name ,path from v$asm_disk;
SQL>select group_number,name ,path from v$asm_disk;
GROUP_NUMBER NAME PATH
------------ ------------- ------------------------------
/dev/oracleasm/disks/DATA014
/dev/oracleasm/disks/DATA013
/dev/oracleasm/disks/DATA018
/dev/oracleasm/disks/DATA017
/dev/oracleasm/disks/DATA016
/dev/oracleasm/disks/DATA015
次数磁盘被重新释放，可以正确的添加了。