公开(公告)号：DE3278773D1

公开(公告)日：1988-08-18

申请号：DE3278773

申请日：1982-08-25

Applicant: IBM

Inventor： DUKE ALAN HERSCHEL ,  HARTUNG MICHAEL HOWARD ,  MARSCHNER FREDERICK JAMES

IPC: G06F3/06 ,  G06F12/08 ,  G06F12/12 ,  G06F13/00

Abstract: In a storage subsystem hierarchy, promotion of data from a backing store (14) to a cache (15) is restricted based upon status of the cache and activity of a last or highest storage reference. Observed writing activity selectively inhibits data promotion. Data promotion occurs after completion of a series of storage access requests.

公开(公告)号：AU548748B2

公开(公告)日：1986-01-02

申请号：AU8867382

申请日：1982-09-24

Applicant: IBM

Inventor： DUKE ALAN HERSCHEL ,  HARTUNG MICHAEL HOWARD ,  MARSCHNER FREDERICK JAMES ,  NOLAN KENNETH PATRICK

IPC: G06F3/06 ,  G06F12/08 ,  G06F13/00

Abstract: A storage subsystem hierarchy has a caching buffer (15) and a backing store (14); the backing store preferably having a disk-type data-storage apparatus. A directory indicates data stored in the caching buffer. Upon a data-storage access, read or write, within a series of such accesses, resulting in a cache miss, all subsequent data storage accesses in the series are made to the the backing store to the exclusion of the caching buffer even though the caching buffer has storage space allocated for such a data transfer. Selected limits are placed on the series to the backing store, such as receiving on end of series (end of command chain) indication from a using unit, crossing DASD cylinder boundaries, receiving an out of bounds address or receiving certain device oriented commands.

公开(公告)号：DE3278651D1

公开(公告)日：1988-07-14

申请号：DE3278651

申请日：1982-08-25

Applicant: IBM

Inventor： DUKE ALAN HERSCHEL ,  HARTUNG MICHAEL HOWARD ,  MARSCHNER FREDERICK JAMES ,  NOLAN KENNETH PATRICK

IPC: G06F3/06 ,  G06F12/08 ,  G06F13/00

Abstract: A storage subsystem hierarchy has a caching buffer (15) and a backing store (14); the backing store preferably having a disk-type data-storage apparatus. A directory indicates data stored in the caching buffer. Upon a data-storage access, read or write, within a series of such accesses, resulting in a cache miss, all subsequent data storage accesses in the series are made to the the backing store to the exclusion of the caching buffer even though the caching buffer has storage space allocated for such a data transfer. Selected limits are placed on the series to the backing store, such as receiving on end of series (end of command chain) indication from a using unit, crossing DASD cylinder boundaries, receiving an out of bounds address or receiving certain device oriented commands.

公开(公告)号：AU8867382A

公开(公告)日：1983-04-21

申请号：AU8867382

申请日：1982-09-24

Applicant: IBM

Inventor： DUKE ALAN HERSCHEL ,  HARTUNG MICHAEL HOWARD ,  MARSCHNER FREDERICK JAMES ,  NOLAN KENNETH PATRICK

IPC: G06F3/06 ,  G06F12/08 ,  G06F13/00 ,  G06F13/04

Abstract: A storage subsystem hierarchy has a caching buffer (15) and a backing store (14); the backing store preferably having a disk-type data-storage apparatus. A directory indicates data stored in the caching buffer. Upon a data-storage access, read or write, within a series of such accesses, resulting in a cache miss, all subsequent data storage accesses in the series are made to the the backing store to the exclusion of the caching buffer even though the caching buffer has storage space allocated for such a data transfer. Selected limits are placed on the series to the backing store, such as receiving on end of series (end of command chain) indication from a using unit, crossing DASD cylinder boundaries, receiving an out of bounds address or receiving certain device oriented commands.