公开(公告)号：AU1926892A

公开(公告)日：1993-01-12

申请号：AU1926892

申请日：1992-05-01

Applicant: STORAGE TECHNOLOGY CORPORATION

Inventor： JAY STUART BELSAN ,  HENRY SOUTHWORTH LUDLAM ,  GEORGE ARTHUR RUDESEAL

IPC: G06F3/06 ,  G06F11/00 ,  G06F11/10 ,  G06F11/20 ,  G11B20/18 ,  G11C29/00

Abstract: This apparatus makes use of a disk drive array to store data records for an associated host processor. This disk drive array emulates the operation of a large form factor disk drive by using a plurality of interconnected small form factor disk drives. These small form factor disk drives are configured into redundancy groups, each of which contains n+m disk drives for storing data records and redundancy information thereon. The use of this configuration is significantly more reliable than a large form factor disk drive. However, in order to maintain compatibility with host processors that request the duplex copy group feature, the phantom duplex copy group apparatus of the present invention mimics the creation of a duplex copy group in this dynamically mapped data storage subsystem using a disk array and a phantom set of pointers that mimic the data storage devices on which the data records are stored.

公开(公告)号：AU637432B2

公开(公告)日：1993-05-27

申请号：AU6710990

申请日：1990-09-26

Applicant: STORAGE TECHNOLOGY CORPORATION

Inventor： JAY STUART BELSAN ,  CHARLES ALLEN MILLIGAN

IPC: G06F3/06

Abstract: The multiple step data read apparatus provides a buffer memory (108-0) for each read/write head (110-0) in the rotating media (111-0) data storage system that can store up to the entire track (400) of data that includes the requested data (Sectors 2-6). The data is fragmented such that the data transferred into the read/write head buffer first is transmitted to the control unit first whether or not that data is at the beginning of the data requested by the control unit. The data is further fragmented such that critical portions of the data are available to the control unit to satisfy the host request as soon as the data is read from the device. This fragmenting results in the data becoming available to the control unit in the minimum time possible and the performance of the subsystem being the maximum possible. In addition each data fragment transfer to the control unit (104) is initiated a predetermined time before the end of the fragment of data such that the read/write head (110-0) reaches the end of the fragment the same time that the last sector of the fragment is transmitted to the control unit (104).