Compare NAS storage and SAN storage in terms of principle, performance, cost, sharing, and application scenarios. Which of the following descriptions is correct? (Multiple choice)

• A.SAN is a high-speed optical fiber-connected disk network, which provides disk resources to the host. It has no file system itself, which is equivalent to a hard disk in the network.
• B.NAS is a storage device with a file system, sharing files through the network, equivalent to a host in the network
• C.NAS performance is higher than SAN, and its cost is higher than SAN
• D.SAN is mainly suitable for file sharing scenarios, sharing is more convenient

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Due to the earthquake, a company's IT system went down at 16:00 on November 11 leading to a business halt. By 23:00 on the same day, the IT system resumed operation and the data at 12:00 of that day can be restored. Then what respectively are the RTO and the RPO?

• A.RTO=7 hours, RPO=3 hours
• B.RTO=7 hours, RPO=4 hours
• C.RTO=4 hours, RPO=7 hours
• D.RTO=2 hours, RPO=4 hours

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The data replication technology based on the SAN network is a storage area network (SAN) between the front-end application server and the back-end storage system, adding a layer of intelligent switches, the front-end is connected to the server host, and the back-end is connected to the storage device.

• A.False
• B.True

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What kind of data does company employees look for in mySQL for payroll?

• A.Metadata
• B.Unstructured data
• C.Structured data
• D.Semi-structured data

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Distributed storage can provide: block services, big data services, object services and file services.

• A.False
• B.True

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