A disaster recovery project adopts Huawei's full-space snapshot solution at the network layer. A snapshot of the source volume will be created at 9:00, and the snapshot will be created at 9:10. During this process, the source volume has a write operation. Which of the following statements are correct?

• A.The snapshot volume is a physical copy of the source volume at 9:00.
• B.The data content of the snapshot volume is the same as the data content of the source volume at 9:10.
• C.The data content of the snapshot volume is the same as the data content of the source volume at 9:00.
• D.The data content of the snapshot volume is the incremental data of the source volume between 9:00 and 3:10.

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When accessing the Linux client of the Huawei Oceanstor9000 cluster, the client parameters can be adjusted to improve the access performance. Which one of the following is wrong?

• A.NFS uses the TCP protocol to send and receive data. Appropriately increasing the buffer area can speed up the TCP transmission speed.
• B.Oceanstor9000 supports giant frames, it is necessary to set the MTU of all front-end and back-end business network ports.
• C.In order to support giant frames, all nodes of the corresponding Oceanstor 9000 need to be set accordingly.
• D.Enabling giant frames can reduce TCP loss and improve performance. The premise is to confirm that all network devices between the Oceanstor 9000 front-end network interface and the client interface must support giant frames.

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Both HDD and SSD hard disks show huge performance differences under different IO patterns. The Append Only Plog technology in Huawei's distributed storage can provide the best down-disk performance model for different hard disk types.

• A.True
• B.False

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A large e-commerce company A purchased Huawei's hyper-converged storage products to build a private cloud. Which of the following reflect the advantages of the product? (Multiple choice)

• A.The self-service delivery process enables users to quickly obtain the resources they need
• B.Unified management of physical resources and virtual resources, support for unified management of heterogeneous virtualization
• C.Unified presentation of management information such as alarms, topology, performance, reports, etc. of various cloud service resource pools
• D.Unified service catalog

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Which are characteristics of the NFS service provided by Huawei OceanStor 9000? (Multiple Choice)

• A.The sharing service is provided by a cluster. Nodes in the cluster can monitor the service status of each other.
• B.Huawei OceanStor 9000 supports NFSv3 and NFSv4.
• C.The NFS service is compatible with a wide range of operating systems, allowing file resource sharing in a heterogeneous network environment.
• D.Load balancing is implemented based on the states of services and nodes. Data access requests are evenly distributed in the cluster.
• E.If a node is faulty, client services served by that node will be quickly switched to another node, ensuring service continuity.

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