Regarding SmartMigration LUN information exchange, which of the following descriptions are correct? (Multiple choice)

• A.The LUN information exchange needs to stop business.
• B.After the LUN information is exchanged, the host will send data read and write requests to the LUN ID of the target LUN.
• C.Before and after LUN information exchange, the LUN ID of the source LUN remains unchanged.
• D.Before and after LUN information exchange, the data volume ID of the source LUN will change.

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The IntoTier feature is also called automatic hierarchical storage, which stores files on storage devices with the same performance according to file attributes, and realizes automatic migration of files between storage devices.

• A.False
• B.True

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In the Huawei disaster recovery solution, at which levels can data replication be performed? (Multiple choices)

• A.Copy based on the file system layer
• B.Based on network layer replication
• C.Based on storage layer replication
• D.Host-based replication

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The game live broadcast platform A uses Huawei's all-flash storage to protect its business, and the storage system uses FlashLink technology designed specifically for flash memory. Which of the following statements about writing ROW in full scale and large block order are correct? (Multiple choice)

• A.Big data blocks, big data blocks are sequentially written to the SSD
• B.Multiple discrete data blocks are aggregated into a continuous in controller memory
• C.One-segment large block sequential write makes full use of SAS bandwidth to reduce garbage collection
• D.The controller perceives the data layout in the SSD

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The three elements of the CAP principle of a distributed database system are: Consistency, Availability, and Partition tolerance.
Regarding the three elements of CAP that the database follows, which of the following descriptions are correct? (Multiple choice)

• A.For most web application databases, they follow the CPA principle. In design, consistency is usually sacrificed in exchange for high availability. Partition tolerance of traditional relational databases is a basic requirement.
• B.For distributed data systems, partition tolerance is a basic requirement
• C.In a distributed system, these three elements can only achieve two points at the same time at most, and it is impossible to give consideration to all three.

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