Data migration method and system

Abstract

The embodiment of the invention relates to a data migration method applied to a source intelligent network card. The method comprises the steps that a first migration instruction is received, the first migration instruction carries an address of to-be-migrated data in a source SSD and information of a target SSD where the to-be-migrated data is migrated, and the target SSD belongs to a target storage array; a read instruction is sent to the source SSD, and the read instruction comprises the address of the source SSD carried by the first migration instruction and access information of the source migration cache and is used for indicating the source SSD to read the to-be-migrated data to the source migration cache; a second migration instruction is sent to a target intelligent network card of the target storage array, the second migration instruction comprises access information of the source migration cache and a target SSD address determined according to the target SSD information, and the second migration instruction is used for indicating the target intelligent network card to migrate the to-be-migrated data in the source migration cache to the target storage array.

Description

[0001] This case is a divisional application with the patent application number 201780002932.1, the filing date is September 5, 2017, and the invention name is "Data Migration Method, System, and Smart Network Card". technical field [0002] The invention relates to the technical field of storage, in particular to a data migration method between storage devices. Background technique [0003] In practical applications, it is often necessary to migrate data between different storage arrays in a storage system. For example, in a storage system, due to the huge number and capacity of SSD disks, the probability of failure will be relatively high. In order to avoid data loss, it is necessary to pre-identify the SSD that is about to fail, that is, the pre-failure SSD, and then save the pre-failure SSD. The data in the failed SSD is migrated to the SSDs of other storage arrays in the cluster for backup. [0004] In the prior art, when migrating data in two storage arrays connected ...

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Problems solved by technology

[0005] It can be seen that in the prior art, when data migration is performed between storage arrays in a storage system, the migrated data must be migrated through the controller of the source storage array, thus occupying the bandwidth of the controller of the source storage array, and in addition It will occupy the memory of the source storage array and the memory of the target storage array, which will affect the normal access to data in other SSDs in the array, thereby affecting the performance of the entire storage system

In order to reduce the impact of data migration on storage system performance, the bandwidth of the controller occupied by data migration is generally limited, which will lead to a long time for data migration and increase the risk of data loss

In addition, even if the bandwidth of data migration is limited, it will still affect the performance of the storage system

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