Backup can be regarded as a low-level disaster tolerance. Backup is the basis of disaster tolerance, and disaster tolerance can replace backup.

• A.False
• B.True

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Which of the following statements about the snapshot LUN of Huawei's hybrid flash storage device are correct? (Multiple choice)

• A.When the snapshot is just created, the data in the COW space is the source data
• B.After the snapshot is activated, when the application server has a data write request to the source LUN, the pre-write copy process is executed first
• C.When the snapshot is just created, the data in the COW space is empty
• D.After the snapshot is activated, when the application server has a data write request to the source LUN, it directly writes to the snapshot LUN

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Which of the following options do not belong to the advantages brought by the global cache?

• A.Improve cache data access hit rate
• B.Improve overall system performance
• C.Improve cache space utilization
• D.Improve system safety and reliability

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

• A.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
• B.The telegram cache (NVDIMM) is mainly used as a write cache.
• C.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
• 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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For performance reasons it is often necessary to buy a lot of smaller capacity disk drives.

• A.TRUE
• B.FALSE

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