公开(公告)号：JPH03154269A

公开(公告)日：1991-07-02

申请号：JP26491790

申请日：1990-10-02

Applicant: IBM

Inventor： TOOMASU UIRIAMU GUREEZAA ,  RICHIYAADO GURIINBAAGU ,  HAJIYARUMAA HORUMUBOU OTSUTESE

IPC: G06F3/06 ,  G06F11/20 ,  G11B19/12 ,  G11B19/28 ,  G11B20/12 ,  G11B27/00 ,  G11B27/10 ,  G11C29/00

Abstract: PURPOSE: To shorten a response time and to improve availability of data by storing various disk files of a mirror type in each of plural disk drives in a position deviated by a prescribed rotary angle. CONSTITUTION: N pieces of mirror type data files having the same data contents are written in each disk of N pieces of disk drives A1 -AN shifting individual phase relation by 360 degrees/N. A position of each spindle for various disk drives of a cluster is given by a programming signal on a control conductor 63 for driving individual disk. A delay network 62 for disk drive Ai is set so as to cause delay of 360 degrees × i/N for generating an index signal for drive Ai . Thereby, when a data access command is generated, it accesses to the closest file. Therefore, a response time is shortened, while availability of data is improved.