SHARED-DATA-MEMORY CONTROL SYSTEM, SETTING METHOD FOR MASTER PROCESSING DEVICE AND DATA-COPY METHOD

摘要

PURPOSE: To provide an improved lock managing function for a loosely coupled common DASD system. CONSTITUTION: Processors 400, 401, and 402 are connected to DASD controllers 403 and 404 through channels 407. A connection part links the processors to DASD controller lock boxes 408 and 409 which control access to DASD devices 405 and 406. The lock boxes 408 and 409 includes lock areas which can be sectioned. The lock boxes 408 and 409 include processing logic for managing locks which are sectioned by using logical locking design.