公开(公告)号：CA1176382A

公开(公告)日：1984-10-16

申请号：CA406369

申请日：1982-06-30

Applicant: IBM

Inventor： CHRISTIAN JOHN H ,  HARTUNG MICHAEL H ,  NOLTA ARTHUR H ,  REED DAVID G ,  RIECK RICHARD E ,  WILLIAMS JOHN S

IPC: G06F12/08 ,  G11C9/06 ,  G06F13/06

Abstract: The disclosure relates to promotion of data from a backing store (disk storage apparatus termed DASD) to a random access cache in a storage system such as used for swap and paging data transfers. When a sequential access bit is sent to the storage system, all data specified in a read "paging mode" command is fetched to the cache from DASD. If such prefetched data is replaced from cache and the sequential bit is on, a subsequent host access request for such data causes all related data not yet read to be promoted to cache. For a certain implementation, a maximal amount of related data is promoted; such maximal amount is determined by cache addressing characteristics and DASD access delay boundaries. Without the sequential bit on, only the addressed data block is promoted to cache. TU981014