Execute ASM Rebalance 1 time while adding & droppping disks

Sometimes it is required to add disks and drop disks sequentially in ASM environments. For example diskgroup migration between SAN , disk arrays etc .. , the disks are added and dropped . In this situation as default rebalance operation executes after every add & drop statements . 

alter diskgroup DATA add disk 

'ASMNEWDDISK_1',

'ASMNEWDDISK_2',

'ASMNEWDDISK_3' rebalance power 4;

alter diskgroup DATA drop disk 

'ASMOLDDDISK_1,

'ASMOLDDDISK_2,

'ASMOLDDDISK_3' rebalance power 4;

With this above statements rebalance operation executes 2 times , and not necessary. In order to execute rebalance in one operation , following statement can be used.

alter diskgroup DATA add disk 

'ASMNEWDDISK_1',

'ASMNEWDDISK_2',

'ASMNEWDDISK_3' 

drop disk 

'ASMOLDDDISK_1,

'ASMOLDDDISK_2,

'ASMOLDDDISK_3' rebalance power 4;