Array controller, solid state disk, and method for controlling solid state disk to write data

A method for writing data into a solid state disk (SSD), wherein the SSD comprises one or more flash memory chips, each flash memory chip comprises a plurality of physical blocks, the method comprising:

• obtaining from the SSD, by an array controller coupled to the SSD, information of a logical block of the SSD, wherein the information of the logical block includes size and identification information of the logical block, wherein the logical block corresponds to multiple physical blocks of the SSD, and the multiple physical blocks are located in different channels of the SSD, and wherein the logical block is in a to-be-written state;
• receiving, by the array controller, data from a host, wherein the received data has contiguous logical addresses;
• writing, by the array controller, the received data with contiguous logical addresses into a cache of the array controller;
• when a total size of data in the cache reaches the size of the logical block, dividing, by the array controller, the data in the cache into one or more data writing requests, wherein each of the data writing requests includes the identification information of the logical block and at least a portion of the data in the cache, and the data in each of the writing requests has contiguous logical addresses;
• sending, by the array controller, the one or more data writing requests to the SSD;
• identifying, by the SSD, the logical block of the SSD according to the identification information of the logical block included in the one or more data writing requests;
• and
• writing, by the SSD, the data carried in the one or more data writing requests to the multiple physical blocks corresponding to the logical block in parallel, such that the multiple physical blocks are filled with the data with contiguous logical addresses.