The hard disk unit of Huawei's all-flash storage system adopts the self-developed SSD, which is mainly composed of a control unit and a storage unit. The control unit includes the SSD controller, host interface, NANDFLASEH particles, etc., and the storage unit is mainly DRAM.

Which statement about distributed storage is wrong?

In Huawei all-flash memory, which of the following upgrade methods does not require resetting (restarting) the controller?

The NDMP backup feature of Huawei OceanStor 9000 storage device only supports NDMP protocol V4.

A securities company, in order to ensure business continuity, plans to establish a disaster recovery structure with three centers in two places. It is designed to ensure that services can be quickly switched in the disaster recovery center in the event of a circuit failure or fire in the production center, so as to maximize the protection of business. continuous operation of the system. At present, the company has deployed a production data center, an intra-city disaster recovery center and a remote disaster recovery center. The general situation is as follows.
1) A production center: Windows/linux operating system, database, etc.,
2) Disaster recovery center in the same city in location A: 100 KM away from the production center;
3) C remote disaster recovery center: 1000 KM away from the production center.
The customer requires RPO=0, RTO=0 between data centers in the same city, and the remote disaster recovery center is used as the data-level disaster recovery center, and the data recovery RPO is less than 10 minutes.
Which of the following statements about the construction of three centers in two places in the project is correct? (Multiple Choice)