Patent ID: 11861204
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G  Y | IPC G

Claim 11:
12. A method of operating a storage system including, a management node and multiple storage nodes, each of the multiple storage nodes including a first storage device of a first type a second storage device of a second type, a third storage device of a third type, a performance level of the first storage device being higher than a performance level of the second storage device, a performance level of the second storage device being higher than a performance level of the third storage device, wherein both the first storage device and the second storage device provide a cache interface accessed by a central processing unit (CPU), and wherein the third storage device is configured to persistently store data, the method comprising:
creating, by the management node, a globe cache comprising the first storage device and the second storage device in each storage node, wherein the memory pool includes a first tier comprising the first storage device in each storage node, and a second tier comprising the second storage device in each storage node, wherein the first tier is configured for storing data with a high access frequency, and the second tier is configured for storing data with a medium access frequency, and wherein the storage system further provides a storage pool for storing data with a low access frequency, the storage pool containing the third storage device in each storage node;
monitor, by the management node, an access frequency of target data in the first tier, wherein the target data is located in the first storage device of a first storage node in the multiple storage nodes; and
instruct, by the management node, the first storage node to migrate the target data from the first tier to the second tier within the globe cache, when the access frequency of the target data is lower than a threshold.