Patent ID: 7143209
Filing Date: 2006-11-28
Classification: G06F

Abstract:
1. A storage control apparatus for accessing data stored in a concatenation unit having a plurality of logical units, each logical unit being comprised of one or more physical units, by a request from a host, comprising: a channel adapter for interfacing with said host; and a plurality of controllers which control each one of the plurality of logical units, wherein when said channel adapter receives said request from said host, said channel adapter sends an I/O data request for one logical unit of said plurality of logical units to a first controller which causes said one logical unit to execute I/O processing in said first controller, and then said channel adapter sends another I/O data request for another logical unit of said plurality of logical units to a second controller which causes said another logical unit to execute I/O processing in said second controller, and wherein said first controller judges whether said I/O data request is an I/O request extending over to said second controller which is in charge of said another logical unit after said I/O processing in said first controller, and sends a message indicative of the judgment result to said channel adapter.