The common hardware faults of the OceanStor enterprise storage devices include: (Multiple Choice)

The storage device has two controllers A and B.
If the BBU of controller A fails, which of the following descriptions is correct?

A company plans to purchase Huawei all-flash storage devices to deploy storage services. In order to ensure the security of storage business data, the storage devices cannot communicate with the external network. After the storage device is deployed, you can configure the eService service to manage the operation and maintenance of the storage device to improve the efficiency of operation and maintenance.

Operation and maintenance are based on technology and provide higher-quality services through technical guarantee products. Which of the following aspects can be used to improve the quality of operation and maintenance? (Multiple choice)

A colleague customized an active-active disaster recovery solution for a customer. The customer already has a third-party storage system and plans to purchase a new OceanStor 5300 V3, and place the two sets of devices in two data centers to implement active-active disaster recovery. Which solution?