Which of the Following Are Correct Regarding a Storage Array

Which of the following are correct regarding a Storage Array RAID 2.0 Typical Application Performance Tuning? (multiple choice)

A) Scenario; Sequencing large IO services, especially 1M IO scenarios, with the phenomenon that the back-end read bandwidth is much larger than the front-end read bandwidth Tuning; Turn off the corresponding LUN prefetch policy
B) scene the order of pressure reading and writing business conditions, high utilization of hard drives Tuning means; increase the unplug-thresh device hard disk device
C) Scenario; Oracle database in the operation of data backup, the data on the LUN bandwidth does not meet the requirements and accompanied by high utilization of hard disk Tuning means; the formal creation of POOL to increase the depth of the points
D) Scenario; In the case of single concurrent or low concurrent read service, the delay is found to be large Tuning means; change disk unplug 8 Modify unplug - thresh increased from 4 to 8