公开(公告)号：JP2001125829A

公开(公告)日：2001-05-11

申请号：JP30660599

申请日：1999-10-28

Applicant: IBM ,  PROMISE TECHNOLOGY INC

Inventor： KANAMARU ATSUSHI ,  ASANO HIDEO ,  KIHASHI AKIRA ,  KUSHIDA KOICHI ,  SAITO TAKAHIRO ,  CHICHEN UU ,  KELVIN KAO

IPC: G06F12/08 ,  G06F3/06 ,  G06F9/32 ,  G06F9/34 ,  G06F9/38 ,  G06F13/38

Abstract: PROBLEM TO BE SOLVED: To execute detailed analysis and prediction by an outside controller in reponse to a true request from an application, and to issue a look-ahead request to an auxiliary storage device such as an HDD. SOLUTION: An HDC card 21, which stores data and is connected to an HDD device 22 having a cache memory, is provided with an access request trace part 61 for directly tracing a true access request from an application program to be executed by a host from the application program, a speculative request deciding part 62 for deciding a speculative request estimated in the future based on the traced true access request, and an HDC 31 for issuing the decided speculative request to the HDD device 22.

公开(公告)号：JP2003122631A

公开(公告)日：2003-04-25

申请号：JP2001316036

申请日：2001-10-12

Applicant: IBM

Inventor： KUSHIDA KOICHI ,  KANAMARU ATSUSHI ,  SAITO TAKAHIRO

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

Abstract: PROBLEM TO BE SOLVED: To efficiently execute a reading request issued from a host computer when a writing request is cached in a cache memory. SOLUTION: When a reading request is transferred, whether or not a cache memory is put into a memory state that the cache memory can cache the reading request is judged (S103). When it is impossible, the oldest writing request and the other prescribed writing request are executed after the order of execution is optimized so that the reading request can be cached by the cache memory (S107, S113). And, the cached reading request is executed preferentially to the writing request remaining in the cache memory by an RBPW (S111). Therefore, it is possible to efficiently execute the reading request.