Differential data backup method and differential data backup device

Abstract

The invention provides a differential data backup method, a differential data backup device and a storage system. The storage system comprises a processor, production volume and target volume. The records of the differential data between two serial numbers are obtained by the processor, and the serial numbers are used to identify the time segment of the data written into the production volume. The first serial number in the two serial numbers is an allocated serial number of data received by the production volume at the most recent time before the creation of the first snapshot of the production volume, the second serial number in the two serial numbers is an allocated serial number of data received by the production volume at the most recent time after the creation of the second snapshot of the production volume. The records of the differential data comprise the logical addresses of the differential data received within the time segment identified by all the serial numbers between the two serial numbers. The backup data are obtained from the second snapshot by the processor according to the records of the differential data, and are sent to the target volume. The suspension of data writing requests can be avoided, and the efficiency of data processing by the storage system is increased.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of storage, in particular, a differential data backup method and a differential data backup device. Background technique [0002] A typical data disaster recovery system includes a production center and a disaster recovery center. In the production center, hosts and storage arrays are deployed for normal business operation; in the disaster recovery center, hosts and storage arrays are deployed for taking over the business after a disaster occurs in the production center. Wherein, the storage array of the production center or the disaster recovery center includes multiple data volumes, and the data volume is a segment of logical storage space mapped from the physical storage space. After the data generated by the business of the production center is written into the production array, it can be backed up to the disaster recovery center through the disaster recovery link and written i...

AI Technical Summary

Problems solved by technology

[0004] However, in order to ensure the data consistency between the production array and the disaster recovery array, the production array needs to suspend the write data request before creating the snapshot, so as to prevent the changed data from not being recorded in the snapshot, resulting in the data in the production array being inconsistent with the disaster recovery Inconsistent data in the array

However, pending write data requests often affect the efficiency of data processing in production arrays

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