问题：
[多选题]
Immediately after adding a new disk to or removing an existing disk from an ASM instance, you find that the performance of the database goes down initially until the time the addition or removal process is completed, and then gradually becomes normal.
Which two activities would you perform to maintain a consistent performance of the database while adding or removing disks?（）
A、Define the POWER option while adding or removing the disks
B、Increase the number of ARB processes by setting up a higher value for ASM_POWER_LIMIT.
C、Increase the number of DBWR processes by setting up a higher value for DB_WRITER_PROCESSES
D、Increase the number of slave database writer processes by setting up a higher value for DBWR_IO_SLAVES
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