Method, device, and system for writing data

Abstract

The invention provides a data writing technology. A first controller receives a first write request, which comprises a fist data, a first write address, and an LUN ID; the first controller requests to lock the write permission of the first write address in the LUN; after the first controller obtains the write permission of the first write address, the first controller writes the first data into the first controller according to the first write request and sends a first write sub-request to a second controller, wherein the first write sub-request carries the same content as that of the first write request; and after the first controller finishes writing the first data in the first controller and receives the response message that the first write sub-request is successfully written, the first controller releases the locked write permission of the first write address.

Description

technical field [0001] The present invention relates to the field of IT, in particular to a storage technology. Background technique [0002] The traditional disaster recovery data center or two-site three-center (3Data Center, 3DC) can back up data from the local production center to the remote disaster recovery center through the remote replication technology of the storage array to ensure data security. However, if the production center is down, it will take a long time, such as several hours, to start the disaster recovery center, which means that the recovery time objectives (RTO) of this technology are relatively long. [0003] In one solution, two data centers are deployed, and each data center has a controller. One controller acts as the master controller and the other acts as the slave controller. When the slave controller receives a read and write request, it forwards the request to the master controller for processing. This method can reduce the RTO to a certai...

AI Technical Summary

Problems solved by technology

This approach can reduce RTO to a certain extent, but in its processing flow, multiple information interactions between controllers are required, and the time delay is still relatively large.

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