公开(公告)号：JPH0844497A

公开(公告)日：1996-02-16

申请号：JP11341395

申请日：1995-05-11

Applicant: IBM

Inventor： RICHIYAADO KENTO TORAIBAA ,  JIYONASAN MAABU HASUUERU ,  SUPENSAA WAA FUN NGU ,  YAMAGUCHI MARIO

IPC: G06F3/06 ,  G06F12/08

Abstract: PURPOSE: To provide a system for managing data transfer among a computer, data storage disk and data buffer related to the disk. CONSTITUTION: At the time of receiving a writing request during pre-reading from a disk 22 to a buffer 24, this system preferentially uses the pre-reading for writing data in the disk 22 only when a target writing track on the disk 22 is different from a track during the pre-reading to the buffer 24. Otherwise, the system continues the pre-reading until a target writing sector is positioned under a disk drive head. Also, at the time of receiving a reading request during cache writing from the buffer 24 to the disk 22, the system immediately fulfills the reading request before the cache writing is completed, when requested reading data are housed in the buffer 24. Moreover, this system performs dynamic switching between two polices: a data pre-reading preferential using policy and a data pre-reading non-preferential using policy, based on the parallel monitoring and comparison of a data request service time.

公开(公告)号：JPH0336642A

公开(公告)日：1991-02-18

申请号：JP16586890

申请日：1990-06-26

Applicant: IBM

Inventor： MAAGARETSUTO AN DONGU ,  RICHIYAADO KENTO TORAIBAA

IPC: G06F12/02 ,  G06F9/46 ,  G06F9/50

Abstract: PURPOSE: To perform the computer system resource management adapted to the condition change by providing a stage where an extended pool including additional resources to add it to a master pool and, according to circumstances, a stage where the extended pool is deleted to reduce the master pool. CONSTITUTION: Extended pools including additional resources are generated and are chained to the master pool. They are assigned to and released from the master pool in accordance with their use or disuse in a process, and released resources in an active extended pool are transferred to the master pool, and released resources in a released extended pool are transferred to an extended pool. If the released extended pool includes all of resources belonging to it at the time of returning unassigned resources belonging to the released extended pool from the master pool to an extended pool, the released extended pool is deleted. A minimum instruction of IBM 370 compare-double-swap is used to peculiarly serialize stages of assignment and release from the first chain toward the chain of an objective pool with respect to control elements of resources, and they are transferred between master and extended pools, thereby effectively managing the resources.