A data migration method and device

Abstract

The invention discloses a data migration method. The method comprises the steps of establishing a migration route of migration data to a target medium, and at the same time, retaining an original route of the migration data to a source medium; during the process of data migration, when a reading instruction to the migration data is received, conducting query first through the migration route, and if the query fails, then conducting query through the original route; writing in corrected new data directly through the migration route when a correcting instruction to the migration data is received; and when a deleting instruction to the migration data is received, conducting deleting first through the original route and then through the migration route. The invention further discloses a data migration device. During the process of data migration, read-write visit to data of a user does need to be limited, and the process of data migration is completed instantly in a user-oriented layer, namely, instant expansion of a storage system is realized, and data service interruption cannot be caused.

Description

technical field [0001] The invention relates to a method for lossless capacity expansion of a data layer in the field of storage technology, and in particular to a data migration method and device. Background technique [0002] Data migration has always been a relatively difficult part of distributed storage products, because it is necessary to move data without affecting user access, so in order to reduce the impact of data migration on user access, basically only a small amount of data can be moved each time, and This part of the data cannot be modified during the move until the data migration is completed and the restrictions on data modification are restored. [0003] Specifically, the data that needs to be migrated can be divided into N data domains, and each time the data domain is used as a unit to relocate, the process is to control the access layer of the storage system first, so that the data in the data domain to be migrated is read-only , and then read the data ...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned existing data migration methods are feasible in some application scenarios, but in some applications with frequent data exchange, such as online game applications, the data interaction between different users is very frequent, and the relationship between data is intricate. If some data cannot be modified, in addition to affecting the access of users who need to use this part of data, it may also affect the access of other users and cause damage to the game logic

[0005] It can be seen that the existing data migration method cannot be applied to all application scenarios because it must restrict the user's access to the migrated data, and the existing data migration is a long-lasting process that involves network interaction and machine throughput, which can only be slow Migrate gradually; for example, when migrating data to expand the capacity of the data storage system, if the migration speed is slow and the original data storage capacity of the system is close to exhaustion, if the data business volume soars at this time, the data migration speed cannot keep up with the business If the data growth rate is too high, it is likely to cause storage explosion, leading to serious consequences of data storage service interruption

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