Path switching control method and system in multipath storage system

Abstract

The invention relates to a storage technology, in particular to a path-state query technology in the multi-path storage system for improving the success rate of the path- switching. A path-switching control method in the multi-path storage system includes that the multi-path control module is queried that if the target path-state for the switching fulfills the switching condition before the path-switching is processed; the path-switching is processed if the target path-state fulfills the switching condition according to the returned result of the multi-path control module. A path-switching control system in the multi-path storage system includes a multi-path management module and a multi-path control module. Based on the path-state query technology, the target path-state is prejudged if the target path state fulfills the switching condition before the path-switching is executed; thereby, the success rate of path-switching is improved and the possibility that the path-switching has theinfluence on the storage performance of the system is reduced.

Description

technical field [0001] The invention relates to a storage technology, in particular to a path state query technology in a multi-path storage system. Background technique [0002] In the field of storage, a multipath storage system is an important part of a storage network. The application scenarios of the multipath storage system are as follows: figure 1 As shown, the host is connected to the switch through the optical fiber, and the switch is connected to the storage device through the optical fiber. The multipath control module is a software module running on the host (server) and is used to automatically protect multiple connection paths between the host (server) and the storage device. The principle of the multi-path storage system is: the multi-path control module divides logical volumes on the physical disk of the storage device, and each logical volume is equivalent to a virtual disk, with LUN (Logical Unit Number, logical unit number) as the identification, multi-pa...

AI Technical Summary

Problems solved by technology

[0006] The inventors of the present application found that the above two switching modes only care about whether the path is available, and do not care whether the path status or the operation status of the storage device is suitable for switching. Therefore, after the switching is completed, it may cause a heavy load on the available path after switching. , and even lead to serious consequences that the path after the switchover is unavailable, and the storage device may be in a processing state with a higher priority during the switchover process, the path switchover reduces the performance of the storage device, and even causes the switchover to fail

In summary, the switching success rate of the existing switching mode is not high, and may even affect the performance of the entire storage system

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