A method for reading and writing mirrored data

Abstract

The invention discloses a read-write method of mirroring data. The method is applied to a storage system and comprises the following steps: recording the time of a main storage pool and a backup storage pool to return successful data write-in information to a host when the host writes data into the main storage pool and the backup storage pool, finishing write operation when the time of the main storage pool or the backup storage pool to return the successful data write-in information to the host is longer than first preset time, allowing the failing storage pool not to receive a write request within the first preset time, recording response time of the main storage pool when the host transmits a read request to the main storage pool, switching the read request to the backup storage pool for response within second preset time when the response time of the main storage pool is longer than the second preset time, and switching the read request to the main storage pool for the response after the period of the second preset time. The method can effectively perform read-write of the mirroring data and ensures that stability of data mirroring can be kept.

Description

technical field [0001] The invention relates to the technical field of storage systems, and more specifically, to a method for reading and writing mirrored data. Background technique [0002] Data mirroring enables host data to be stored in two different storage pools in real time, one is the main storage pool and the other is the backup storage pool, which is a more reliable data disaster recovery method. In the process of data mirroring, the data read and write strategy is designed. How to ensure that the host can receive the confirmation information of the successful writing of data in time and how to ensure that the two mirrored data can process the read request of the host in a timely and correct manner is the core of the mirrored data read and write strategy. content. [0003] At present, the reading and writing strategy of mirrored data is generally as follows. During the reading process, mirrored data will have a default primary storage pool. The primary storage poo...

AI Technical Summary

Problems solved by technology

[0005] It can be seen that the prior art has the following defects: during the read process, due to the low performance of the backup storage pool, the read request cannot take over the read request when the main storage pool is normal, resulting in a decrease in system processing performance

During the writing process, the host will consider the write operation successful only after the data is successfully written to the two storage pools. If the performance of one storage pool is always at a low level, it will seriously affect the system performance.

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