Data storage method and storage system

Abstract

The invention discloses a data storage method and a storage system. The method comprises the following steps of: an upper computer selectively sends target data to a first controller or a second controller; if the controller which receives the target data is the first controller, the first controller judges whether the target data is processed by the first controller or not according to affiliation information in the target data; if the target data is not processed by the first controller, the first controller forwards the target data to the second controller; if the target data is processed by the first controller, the first controller sends the target data to first caching equipment or second caching equipment to be stored to obtain first mirror image data; and when data in the caching equipment needs to be stored into storage equipment, the first controller stores the data which contains the target data in the first caching equipment and the second caching equipment and is processed by the first controller into the storage equipment. By the above method, requirements on controller memory are reduced, and the pressure of a mirror image path between the controllers is reduced.

Description

technical field [0001] The invention relates to the field of storage, in particular to a data storage method and a storage system. Background technique [0002] Most of the data calculated in the host computer will eventually be sent to the storage device for storage. In order to ensure the reliability of the upper computer to store data in the storage device, the storage system usually adopts a multi-controller structure. For example, if figure 1 As shown, the storage system 120 includes a first controller 121 , a second controller 122 and a storage device 123 . Wherein, the first controller 121 is used for data communication with the upper computer 110, and the second controller 122 is also used for data communication with the upper computer 110, and the first controller 121 and the second controller 122 are connected through PCIe / IB ​​(finiband ) connection, the first controller 121 is connected to the storage device 123, and the second controller is also connected to ...

AI Technical Summary

Problems solved by technology

[0004] However, in this way, the memory of the controller must reserve mirrored data storage space to accommodate the mirrored data sent by other controllers, so the memory capacity of the controller is required to be relatively large

Moreover, since the bandwidth of the PCIe / IB(nfiniband) channel is limited, when there is a lot of mirror data, it will put pressure on the normal data transmission of the PCIe / IB(nfiniband) channel

Finally, when there is a problem with one of the controllers, all data can only be stored through the remaining controllers. In order to ensure the reliability of the data, the remaining controllers will not cache the data in this controller, but Write directly to the storage device, greatly reducing the speed of reading and writing

Images