The storage resources of an enterprise mail application service are limited, so a quota is set for the business user. The soft quota for user A is 500 MB and the hard quota is 800 MB. Under this configuration, which of the following statements are correct? (Multiple choice)

• A.When user A uses 500 MB of space, the system will send a resource shortage alert to the user, and the write fails
• B.When user A uses 500 MB of space, the system will send a resource shortage alarm to the user. When the user adjusts the space to be used below 450 MB, the alarm disappears
• C.User A can use up to 800 MB of the storage system
• D.User A can use up to 500 MB of storage system

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Bank A uses Huawei's all-flash storage to carry its key services. Which of the following can provide data reliability assurance? (Multiple choice)

• A.Active-active, replication, backup to achieve data redundancy between sites
• B.Local snapshots to achieve business data redundancy
• C.RAID 2.0+, multiple copies, to achieve local physical data redundancy
• D.Double mapping of catalog metadata to realize business data logic redundancy

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OceanStor9000 Wushan distributed file system supports online node expansion, storage capacity and computing power increase linearly, and finally provides users with linearly increasing bandwidth and concurrent data.

• A.True
• B.False

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FusionStorage Block adopts a unique data block slicing technology, and a data routing algorithm based on DHT Hash, which can evenly distribute the data of the volume to the fault domain of a larger resource pool, so that each volume can get larger The IOPS and MBPS performance also makes the load of each hardware resource relatively balanced.

• A.False
• B.True

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When selecting the data backup type, which of the following descriptions is wrong?

• A.If the backup strategy is a full backup combined with a differential incremental backup, after a system failure, if you want to restore the most recent data, you need to restore the data from the last full backup and all differential incremental backups after the full backup.
• B.It is recommended to use a combination of three backup types: full backup, differential incremental backup, and cumulative incremental backup.
• C.If there is only cumulative incremental backup in the schedule, but no full backup, all files will be backed up when the cumulative incremental backup is performed for the first time.
• D.Differential incremental can save storage space to the greatest extent, and the backup window is small.

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