A financial customer has purchased multiple Huawei OceanProtect Backup Storage devices for service data backup protection. Which of the following statements are false about the data reduction principle of OceanProtect Backup Storage? (Choose all that apply.)

• A. The backup storage performs feature-based compression for different application data. After compression, the data can be directly written to disks without the need to perform any operations.
• B. In the data reduction process, backup data is divided into blocks of a fixed size based on its content for fixed-length deduplication.
• C. The backup storage can perform deduplication and compression for LUNs but not for file systems.
• D. In the data reduction process, the system performs backup data preprocessing and then variable- length deduplication.

For device reliability purposes, during the quick installation of OceanStor Pacific 9550, engineers need to connect power cables on the storage device supplied by two power modules to separate power distribution units (PDUs).

• A. FALSE
• B. TRUE

A financial customer purchases a Huawei OceanStor Pacific 9950 storage device for service deployment. Engineers have configured basic block storage services on the device. During an O&M management process, an engineer needs to modify the attributes of a storage pool. Which of the following attributes will not be modified?

• A. Storage pool name
• B. Actual location of the storage pool
• C. Capacity alarm threshold
• D. Hot spare policy of the storage pool

During the initialization of Huawei flash storage systems, engineers can set multiple user roles to manage the storage systems. Which of the following user roles have the control permission for storage? (Choose all that apply.)

• A. Super administrator
• B. Read-only user
• C. USM user
• D. Administrator