Regarding the characteristics of a single file system in Huawei's distributed storage, which of the following descriptions are correct? (Multiple choice)

An Internet company's storage system has two businesses, A and B, constantly competing for cache and network resources. This leads to longer time for other businesses. Among them, the business is a transaction processing application, and the B business is an analysis and query application, and the immediate response of the A business needs to be guaranteed. In order to solve this problem, the engineer has provided that the QOS superior optical level of the A business is higher than that of the business.

OceanStor 9000 adopts Erasure code technology to protect data. If a site has 6 nodes, and the customer wants to ensure that the data can be restored even when 3 disks are broken in a stripe, what are the redundancy protection levels that can be used? (Multiple choice)

When analyzing and adjusting the factors that affect the performance of Huawei Oceanstor 9000 client, the steps involved are:
A) Check and adjust external interference factors
B) View the performance indicators of performance monitoring tools
C) Check and adjust the system configuration
Which item should be in the correct order?

Which types of deduplication are supported by the Huawei OceanStor All-In-One Backup Solution? (Multiple Choice)