本文介绍如何使用Oracle ASM的ALTER DISKGROUP命令手动再平衡磁盘组，并通过设置POWER参数来控制再平衡速度。从0到11的值分别对应不同的执行速度，其中0会停止再平衡操作，而11则允许ASM尽可能快地执行该操作。默认情况下，如果未指定POWER子句，则使用ASM_POWER_LIMIT初始化参数的值。
alter diskgroup diskgroupname rebalance power 1
alter diskgroup diskgroupname rebalance power 2
...
...
alter diskgroup diskgroupname rebalance power 11
Use this clause to manually rebalance the disk group. Automatic Storage Management redistributes datafiles evenly across all drives. This clause is rarely necessary, because Automatic Storage Management allocates files evenly and automatically rebalances diskgroups when the storage configuration changes. However, it is useful if you want to use the POWER clause to control the speed of what would otherwise be an automatic rebalance operation.
POWER In the POWER clause, specify a value from 0 to 11, where 0 stops the rebalance operation and 11 permits Automatic Storage Management to execute the rebalance as fast as possible. The value you specify in the POWER clause defaults to the value of the ASM_POWER_LIMIT initialization parameter.
If you omit the POWER clause, then Automatic Storage Management executes both automatic and specified rebalance operations at the power determined by the value of the ASM_POWER_LIMIT initialization parameter.
WAIT | NOWAIT Use this clause to specify when in the course of the rebalance operation control should be returned to the user.
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Specify
WAITto allow a script that adds or removes disks to wait for the disk group to be rebalanced before returning control to the user. You can explicitly terminate a rebalance operation running inWAITmode, although doing so does not undo any completed disk add or drop operation in the same statement. -
Specify
NOWAITif you want control returned to the user immediately after the statement is issued. This is the default.
You can monitor the progress of the rebalance operation by querying the V$ASM_OPERATION dynamic performance view.
请注意：V$ASM_OPERATION 请在asm实例中查看
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