公开(公告)号：CA1187199A

公开(公告)日：1985-05-14

申请号：CA411849

申请日：1982-09-21

Applicant: IBM

Inventor： DUKE ALAN H ,  HARTUNG MICHAEL H ,  MARSCHNER FREDERICK J ,  NOLAN KENNETH P

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

Abstract: A storage hierarchy has a caching buffer and a backing store; the backing store preferably having 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 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：CA1180463A

公开(公告)日：1985-01-02

申请号：CA406399

申请日：1982-06-30

Applicant: IBM

Inventor： BENHASE MICHAEL T ,  DUKE ALAN H

IPC: G06F12/08 ,  G06F17/30 ,  G06F9/32

Abstract: A cache is accessed based upon addresses to a backing store having a larger address space than the cache. The backing store consists of plurality of devices exhibiting delay access boundaries. The cache accessing is based upon a hashing method and system derived from the arrangement of the backing store and in an ordered manner for accommodating the delay access boundaries and enable rapidly adjusting the hash parameters in accordance with changes and backing store capability and other hardware changes.