Compared with traditional RAID algorithms, the erasure code redundancy technology provides higher reliability and more flexible redundancy policies.
Which of the following statements about the working principle of erasure code is false?

• A.N+M data blocks are concurrently stored to different nodes.
• B.The erasure code algorithm calculates M parity blocks for every N consecutive data blocks. (The value of N is smaller than that of M.)
• C.Data to be written is divided into N data blocks of the same size.
• D.In erasure code storage mode, a concurrent failure of M-1 disks is tolerated at most.

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Which of the following options belong to the function of the CMS cluster? (Multiple choice)

• A.Monitoring and management
• B.Alarm report
• C.Firmware upgrade
• D.Log collection

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Which of the following is wrong about the configuration of the Huawei Oceanstor 9000 CIFS share?

• A.When oplock (Opportunistic locking) is enabled, files will be cached locally before being sent to the shared storage, which helps to improve client access efficiency
• B.After Notify is enabled, a client's change operation in a directory cannot be sensed by other clients that are accessing this directory and its parent directory
• C.After the mandatory signature is checked, the client will be forced to use the signature function. If the client is not set to start state, Oceantor9000 will reject the client's data access request
• D.After the Guest is enabled, the user does not need to enter the username and password when accessing the shared directory on the client

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What are the values of Huawei Oceanstor 9000 infoTier? (Multiple choice)

• A.It can ensure the system's response speed to hot data access and improve the storage performance of the entire system
• B.Realize automatic file migration according to the corresponding relationship between file attributes and different storage devices, reducing the cost and complexity of manual management
• C.Comprehensive utilization of the cost advantages of different storage media, effectively reducing deployment and maintenance costs
• D.Improve system storage performance and realize intelligent data management

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