asm add disk to diskgroup

Action:

Consider the following configuration:  

/devices/D1 is a member of disk group dgroupA.
 

/devices/D2 is a member of disk group dgroupA.
 

/devices/D3 is a member of disk group dgroupA.
 

You plan to add a new disk, /devices/D4,to the disk group dgroupA.
 

You execute the following command:  

SQL> ALTER DISKGROUP dgroupA ADD DISK
'/devices/D*';

Editor’s notes:

/devices/D1 is a member of disk group DGROUPA.

/devices/D2 is a member of disk group DGROUPA.

/devices/D3 is a member of disk group DGROUPA.

/devices/D4 is a candidate disk.

So,if you execute the command above,oracle will add a member au
tomaticly.

Reblanceis automatically done as disks are added, dropped, or r
esized

ALTER DISKGROUP dgroupA ADD DISK '/devices/D*';

将 D4 添加到 DGROUPA 磁盘组。由于其它磁盘已经是 DGROUPA 磁盘组的成员，

因此即使它们与搜索字符串匹配，第二个语句仍将忽略这些磁盘。向磁盘

组添加磁盘时，ASM 实例将确保该磁盘是可寻址的并且可用，然后，才会对该磁

盘进行格式化并使其重新平衡。由于需要将每个文件的分配单元移到新磁盘上，

因此重新平衡过程非常耗时。