The disaster recovery system can copy business data to a local or remote data center for protection, but not all data corruption/loss can be recovered. Which of the following data corruptions cannot be recovered by the disaster recovery system? (Multiple choice)

• A.Virus attack
• B.Paralysis of the business data center
• C.Human error
• D.Hard disk failure

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OceanStor900 uses general x86 architecture hardware to deploy the Scale-out NAS system. All nodes achieve high concurrency and high performance of the entire system data, mainly relying on three types of networking types: IB, 10GE and PCIE. Among them, PCIE has better network performance. Good, easier to expand and manage.

• A.False
• B.True

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In the deployment scenario of FusionStorage file service, the customer deploys ten FusionStorage nodes and two management network switches. At this time, the number of IP addresses that need to be assigned to its management network is?

• A.14
• B.18
• C.12
• D.16

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Regarding the description of the cache in Huawei Oceanstor 9000, which of the following is incorrect?

• A.The first level cache is the read cache of the storage node, and the location of the global cache is in the first level cache
• B.The second level cache is used to cache the hot data of this node. At the same time cache the hot data of the same node and other nodes
• C.The telegram cache (NVDIMM) is mainly used as a write cache.
• D.The second level cache is composed of SSD disks. If there is no SSD disk in the node, there is no the second level cache

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Which of the following statements about Huawei OceanStor Backup Solution is false?

• A.Backup software can back up data to tapes for offline archiving.
• B.If source data and backup data have the same format, a host can directly read and write the backup data.
• C.Compared with disaster recovery, backup provides a finer restoration granularity, such as taking files as the restoration level and offering multiple backup points in time.

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