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公开(公告)号：DE69328853T2
公开(公告)日：2000-12-07
申请号：DE69328853
申请日：1993-09-13
Applicant: IBM
Inventor： CANDELARIA SUSAN KAY , HANSON DEAN LEE , KWOK ROBERT LAM , LANE KENNETH WAYNE , NORDAHL DONALD MARVIN , REID MARK ALBERT , SHERMAN II WILLIAM GRISWOLD
Abstract: A method and system for enhancing efficiency of data accessing within a storage subsystem, preferably including a DASD with multiple disks, which is coupled to a host system via a storage subsystem controller. Recording tracks are accessed utilizing multiple switchable transducer heads. A signal transmitted from the host system is utilized to define a transducer head switching table within the storage subsystem controller listing each track to be accessed and an associated control parameter for selecting a particular transducer head to be utilized to access a subsequent track. Each time the end of an accessed track is encountered, this table is accessed and the control parameter associated with that track is accessed and coupled to the DASD in order to select a subsequent track for access. A pointer is established into this table at the listing of an initially accessed track and access may be terminated when that pointer is encountered.
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公开(公告)号：DE69123014D1
公开(公告)日：1996-12-12
申请号：DE69123014
申请日：1991-08-09
Applicant: IBM
Inventor： BEARDSLEY BRENT CAMERON , BELLO KEITH ANTHONY , BENHASE MICHAEL THOMAS , CLARK FLORENCE JOANN , HUNTER PAUL WAYNE , NORDAHL DONALD MARVIN
Abstract: A control unit (12) for DASD operation to transfer data between the device (13) and a buffer (16) and between a channel (11) and a buffer (16). In that manner the channel and device are enabled to transfer data independently of each other. Mechanisms are provided for communication between the channel interface process in the control unit and the device interface process in the control unit. Some of these mechanisms are stored with the record in the buffer and others are stored in control storage. Principle communicating mechanisms include a device record pointer, a channel record pointer, a next operation field, a device state indicator, record control flags, and two buffer pointers.
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公开(公告)号：DE69328853D1
公开(公告)日：2000-07-20
申请号：DE69328853
申请日：1993-09-13
Applicant: IBM
Inventor： CANDELARIA SUSAN KAY , HANSON DEAN LEE , KWOK ROBERT LAM , LANE KENNETH WAYNE , NORDAHL DONALD MARVIN , REID MARK ALBERT , SHERMAN II WILLIAM GRISWOLD
Abstract: A method and system for enhancing efficiency of data accessing within a storage subsystem, preferably including a DASD with multiple disks, which is coupled to a host system via a storage subsystem controller. Recording tracks are accessed utilizing multiple switchable transducer heads. A signal transmitted from the host system is utilized to define a transducer head switching table within the storage subsystem controller listing each track to be accessed and an associated control parameter for selecting a particular transducer head to be utilized to access a subsequent track. Each time the end of an accessed track is encountered, this table is accessed and the control parameter associated with that track is accessed and coupled to the DASD in order to select a subsequent track for access. A pointer is established into this table at the listing of an initially accessed track and access may be terminated when that pointer is encountered.
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公开(公告)号：CA2046720C
公开(公告)日：1995-10-24
申请号：CA2046720
申请日：1991-07-10
Applicant: IBM
Inventor： BEARDSLEY BRENT CAMERON , BELLO KEITH ANTHONY , BENHASE MICHAEL THOMAS , CLARK FLORENCE JOANN , HUNTER PAUL WAYNE , NORDAHL DONALD MARVIN
Abstract: A control unit for DASD operation to transfer data between the device and a buffer and between a channel and a buffer. In that manner the channel and device are enabled to transfer data independently of each other. Mechanisms are provided for communication between the channel interface process in the control unit and the device interface process in the control unit. Some of these mechanisms are stored with the record in the buffer and others are stored in control storage. Principle communicating mechanisms include a device record pointer, a channel record pointer, a next operation field, a device state indicator, record control flags, and two buffer pointers.
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