STORAGE SUB SYSTEM, CONTROL METHOD FOR I/O INTERFACE AND INFORMATION PROCESSING SYSTEM

摘要

PROBLEM TO BE SOLVED: To suppress the increase of response time due to an execution of staging following a cache miss. SOLUTION: In the information processing system, the storage sub system composed of a disk controller 2 provided with a cache memory 24 and a subordinate disk device 3 is connected to a central processor 1 by an interface such as an FC-SB2 where the central processor 1 issues an I/O request composed of a plurality of commands and a chain of data asynchronously to a response from the disk controller 2. The disk controller 2 is provided with a function concurrently carrying out a process executing a command where object data hits the cache memory 24 and a process staging object data of a command of a cache miss from the disk device 3 to the cache memory 24.