公开(公告)号：DE69327892D1

公开(公告)日：2000-03-30

申请号：DE69327892

申请日：1993-08-25

Applicant: IBM

Inventor： BEARDSLEY BRENT CAMERON ,  BENHASE MICHAEL THOMAS ,  BLOUNT LAWRENCE CARTER ,  CANDELARIA SUSAN KAY ,  HYDE JOSEPH SMITH

IPC: G06F3/06 ,  G06F13/12

Abstract: A storage system controller, coupled to one or more host computers via multiple communication channels, is utilized to control access to one or more direct access storage devices. A host computer authorizes the storage system controller to search within a range of data locations within the storage system, sets an initial location from which the data search will begin, and specifies a key field argument to search for. The host computer then permits the storage system controller to independently search the authorized range of data locations within the storage system or within cache memory within the storage system controller. The storage system controller examines multiple records within the authorized range of data locations to locate a desired record associated with the key field argument and presents a status report to the host computer only after the desired record is located or the entire range of data is searched and the desired record was not located.

公开(公告)号：DE69122337D1

公开(公告)日：1996-10-31

申请号：DE69122337

申请日：1991-07-08

Applicant: IBM

Inventor： BEARDSLEY BRENT CAMERON ,  BENHASE MICHAEL THOMAS

IPC: G06F3/06 ,  G06F13/12

Abstract: Apparatus is disclosed for controlling a disk drive or DASD in a manner that is not synchronous with channel operation, that is, transfer of commands and data are not limited to inter-record gaps periods. A device interface processor controls which recording track is accessed by the DASD with data being transferred to and from a buffer. A device track indicator designates which recording tracks the device will move to in sequence. A channel interface processor controls the movement of data from and to the buffer and channel. A channel track indicator designates the recording track sequence in which the channel interface processor will access the data to be transferred. A method of operation is also disclosed for utilizing the two indicators to enable the device and channel processors to communicate with each other in case the device reads incorrect records in a multi-track read operation.

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

IPC: G06F13/12 ,  G06F3/06 ,  G06F12/00 ,  G06F13/00

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.