Patent ID: 8838892

Claim:
In a storage device, a method for storing data in a storage device, the method comprising: receiving a first performance level request sent by a storage space management device to query information about performance levels of a plurality of Logic Unit Numbers (LUNs) in the storage device, and wherein the first performance level request includes a world wide name (WWN) field used to identify the plurality of LUNs, and wherein a value contained in the WWN field in the performance level request is 0 (zero) to query the information about the performance levels of the plurality of LUNs in the storage device; obtaining the information about the performance levels of the LUNs according to the first performance level request; and sending a first response to the storage space management device in response to the first performance level request, wherein the first response comprises the information about the performance levels of the plurality of LUNs and wherein the first response comprises a logical unit number list (LUN List) field through which the information about the performance levels of the plurality of LUNs is carried, and the LUN List field comprises the WWN of the plurality of LUNs and the information about the performance levels of each of the plurality of LUNs in the storage device, wherein the information about the performance levels of the plurality LUNs comprises performance value ranges of the plurality of LUNs.