A continuous data protection method and device

Abstract

The invention discloses a continuous data protection method and device. The method comprising: step S1, capturing a write IO request O-IO of a protected device; step S2, obtaining address informationof currently storable space of a CDP data warehouse, creating a new C-IO that copies write IO request information into the CDP data warehouse, and generating a metadata structure of the M-IO and establishing a connection between the C-IO and the M-IO; step S3, putting the step S2 newly created C-IO into a queue; step S4, acquiring each piece of C-IO information from each CPU's respective queue orglobal queue; step S5, sending each C-IO to a corresponding CDP data warehouse storage device according to the obtained C-IO information, and writing the M-IO pointed to it to the corresponding CDP metadata storage device. By the invention, the management of the metadata in the continuous data protection can be optimized.

Description

technical field [0001] The invention relates to the technical field of computer data backup disaster recovery, in particular to a continuous data protection method and device capable of optimizing metadata management in continuous data protection. Background technique [0002] In the computer field, in order to protect important data information, data backup technology is usually used to restore data from backup media when the data is unavailable. However, when restoring data, data between two backups may be lost. For some key information systems, the amount of data loss that can be tolerated, that is, the recovery point objective (RPO, Recovery Point Object) should be as low as possible. It is necessary to apply Continuous Data Protection (CDP, Continuous Data Protection) technology. [0003] Continuous data protection technology (CDP) records every write request to protect the disk, backs up the write request data to another storage space, and then restores the data to an...

AI Technical Summary

Problems solved by technology

The disadvantage is that when the system shuts down abnormally, if there is data that has not been flashed in the FIFO queue, a small amount of data will be missed in the CDP data;

[0011] 2. In the write-through mode, the capture module needs to ensure that both the original write request and the CDP write request are successfully written to their respective storage devices before returning to the upper-layer application. The advantage is that under the constraints of strong consistency, the CDP data record After a write request, the RPO of subsequent data recovery is 0. The disadvantage is that the delay of the entire system depends on the joint effect of the original storage and the CDP system. Under different IO pressures, there will be relatively large jitter phenomena

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