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This application discloses a RAID request and response method, a data storage system, and an apparatus, relating to the field of computer technology. By dividing the RAID logical space into a foreground area and a background area according to the progress of background tasks, and determining the target response strategy for the RAID request based on the intersection of the target area of ​​the RAID request to be responded to with the foreground and background areas, the foreground area's target response strategy is used to respond to the RAID request when there is no conflict between the RAID request to be responded to and the background task. This eliminates the need for striping locks and improves request response efficiency. When there is a conflict between the RAID request to be responded to and the background task, it is further determined whether the background task meets the preset request splitting conditions. If it does, it is split to prioritize responding to the part of the request that does not conflict with the background task, further improving request response efficiency.