Cache control method and apparatus.

摘要

A host computer (10) is backed up by long term secondary magnetic disk storage means (14) coupled to the computer by channels (12), a storage director (16) and a control module (18). A cache memory (22) with an associated cache manager (24) are also connected to the storage director (16) for storing data which the host computer (10) is likely to require. In order to allow automatic transfer to the cache memory (22) of only that data which is likely to be required, the storage director (16) and cache manager (24) determine when accessed data from the disk storage means (14) appears to be part of sequential data because it lacks indications to the contrary, such as embedded SEEK instructions. When data lacks such counter indications, automatic transfers to the cache memory (22) occur a track at a time.