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

• A.SAN is more used in the database scenario to store this structured data
• B.The characteristic of NAS is to put the file system of the server in the storage, so that the server can share data through the network.
• C.Now NAS is a storage for unstructured data, such as shared file servers used by employees in many departments for key office document sharing and centralized storage.
• D.DAS, NAS and SAN are all external storage, so storage resource sharing can be easily realized.

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A government unit adopts Huawei's two-location three-center solution for disaster recovery construction, and its business is mainly concentrated from 8:00 to 18:00. Which of the following is wrong?

• A.The production center and the remote disaster recovery center should adopt synchronous remote replication
• B.The BC Manager software can be used to set the data synchronization period
• C.When doing remote replication, a consistency group should be created according to the business of the unit, and related businesses should be placed in a consistent group
• D.The time period for data synchronization between the production center and the disaster recovery center should be selected at night when the business volume is small

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In order to access the bearer server, the data center establishes the infrastructure, which can be divided according to the business? (Multiple Choice)

• A.Enterprise Data Center
• B.Internet Data Center
• C.Operating the data center
• D.Cloud Data Center

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An enterprise has established active-active data centers in city A and city B.
If the active-active arbitration mode of storage (such as Huawei OceanStor hybrid flash memory) is static priority mode, site A is a static priority site.
Which of the following descriptions are correct? (Multiple Choice)

• A.The link between the host and site A and site B fails at the same time, and the dual-active pair status is displayed as *normal"
• B.The link between the storage systems is faulty, and both sites A and B continue to run services
• C.Site B fails, site A automatically takes over the business
• D.Site A fails, site B automatically takes over the business

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What is the difference between synchronous replication and asynchronous replication? (Multiple Choice)

• A.Asynchronous remote replication, when a disaster occurs, data will be lost from the center
• B.Synchronous remote replication will affect the performance of the host, while asynchronous remote replication will not affect the performance of the host
• C.There is no limit to the network distance of synchronous replication
• D.Synchronous replication is to replicate real-time data, and asynchronous replication is to replicate periodic replication

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