What are the functions that can be achieved by storage snapshots? (Multiple Choice)

• A.Use the snapshot LUN data for the development and testing of the new version
• B.Obtain real-time data analysis business status through snapshot data
• C.Take a snapshot of the business LUN at the end of the month and analyze the business data of the previous month through the snapshot.
• D.Take regular snapshots of the storage at 12 o'clock every evening, and use the snapshot data for backup

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Regarding the characteristics of DAS, which of the following descriptions is correct? (Multiple choice)

• A.When multiple hosts connect to DAS, they can provide services of different service levels
• B.If the DAS with tight storage space can share the remaining space of the DAS with excess storage resources
• C.When maintaining the internal DAS, the system needs to be powered off
• D.The number of ports that can be connected to the host is limited

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The steps of asynchronous remote replication technology at multiple points in time. Which of the following statements is correct?
(1) A new time slice (T2, P2) is generated in the cache of the primary LUN and the secondary LUN when each replication cycle starts
(2) The data newly written by the host is cached in the time slice T2 of the main LUN Cache, and the response host is completed
(3) The data received by the master and slave LUN will be downloaded to disk respectively
(4) Copy the data of time slice T1 directly to the slave LUN, and write it into the time slice P2 of the slave LUN

• A.(1) (3) (2) (4)
• B.(1) (2) (3) (4)
• C.(2) (1) (4) (3)
• D.(1) (2) (4) (3)

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The disadvantage of a full backup is that it must rely on the last full backup and the current differential backup to restore the data completely.

• A.True
• B.False

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Which of the following descriptions are correct about SAN and NAS? (Multiple Choice)

• A.Now NAS is geared towards unstructured data storage, such as many department employees for office files and centralized storage
• B.NAS is characterized by putting the server file system in the storage so that the server needs to share data through the network
• C.SAN is more used in data scenarios to store structured
• D.DAS, NAS, SAN are all external storage, so storage resource sharing can be easily realized

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