Huawei Oceanstor 9000 provides a single file system externally with a unified file system namespace. Which of the following descriptions about Oceanstor 9000 unified-namespace is incorrect?

• A.As the root directory of the entire system, the namespace cannot be shared and accessed, as long as the subdirectories below it can be shared and accessed
• B.Each file sharing directory is a subdirectory of the namespace
• C.A unified name space provides users with a unified storage resource pool to achieve centralized management and allocation of storage space
• D.The namespace is automatically created when Oceanstor 9000 is started, and its name is consistent with the system naming

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SmartMigration can relocate all services from the source LUN to the target LUN only when services on the host are stopped.

• A.FALSE
• B.TRUE

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Based on full interconnection of data channels and communication channels, a clustered NAS system employs cluster volume management to manage storage space globally. All nodes in the cluster can access the same storage space using the same volume device name, ensuring block device access consistency.

• A.FALSE
• B.TRUE

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Regarding the description of the data protection function of the Huawei Oceanstor 9000 system, which of the following options is wrong?

• A.After physical domain partitioning is enabled, the failure of hard disks or nodes in a single domain will result in degradation or failure of data reliability in other domains
• B.Oceanstor 9000 realizes N+M redundant storage of data through ErasureCode
• C.When the protection level is N+1, the minimum number of nodes required by the cluster is 3
• D.Oceanstor 9000 realizes redundant storage of metadata through mirroring

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SmartQoS can: (Multiple Choice)

• A.Guarantees resources for non-critical services.
• B.Divide resources based on services.
• C.Improve performance for critical performance and services.
• D.Schedule I/O priority.

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