ASM rebalance ASM_POWER_LIMIT parameter

Parameter ASM_POWER_LIMIT will affect the speed of rebalancing disks, and the resources consumed.

If COMPATIBLE.ASM disk group attribute is set to or higher, then asm_power_limit value range is 0 to 1024.

If COMPATIBLE.ASM disk group attribute is set to lower than , then asm_power_limit value range will be 0 to 11.

We can change the rebalance power either at the ASM instance level or at the individual disk group level.

Changing  the value at the instance level, this will alter the power limit for any new operations, but not the existing ones.

SQL > alter system set asm_power_limit=5 scope=both;

Change the value at the disk group level, this will change an existing operation on the diskgroup involved in the current operation.

SQL> alter diskgroup diskgroup1 rebalance power 8;

The effect of the change can be viewed from v$asm_operation:

SQL> select * from gv$asm_operation;

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