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    DEVICE INITIATED PARTIAL SYSTEM QUIESCING
    1.
    发明专利
    DEVICE INITIATED PARTIAL SYSTEM QUIESCING 未知

    公开(公告)号：CA1299757C

    公开(公告)日：1992-04-28

    申请号：CA570926

    申请日：1988-06-30

    Applicant: IBM

    Inventor： BEARDSLEY BRENT C ,  HEFFERON EUGENE P ,  LYNCH KENNETH R ,  SHIPMAN LLOYD R

    IPC: G06F11/14 ,  G06F11/20 ,  G06F13/00 ,  G06F13/14 ,  G06F15/16 ,  G06F15/177 ,  G06F11/00

    Abstract: A data processing system includes a plurality of host systems and peripheral subsystems, particularly data storage subsystems. Each of the data storage subsystems includes a plurality of control units attaching a plurality of data storage devices such as direct access storage devices (DASD) for storing data on behalf of the various host systems. Each of the control units have a separate storage path for accessing the peripheral data storage devices using dynamic pathing. The storage paths can be clustered into power clusters. Maintenance personnel acting through maintenance panels on either the control units or the peripheral data storage devices activate the subsystem to request reconfiguration of the subsystem from all of the host systems connected to the subsystem. The host systems can honor the request or reject it based upon diverse criteria. Upon each of the host systems approving the reconfiguration, the subsystem is reconfigured for maintenance purposes. Upon completion of the maintenance procedures, a second reconfiguration request is sent to the host systems for causing quiesce devices to resume normal operations. TU986011

    SWITCH AND ITS PROTOCOL FOR MAKING DYNAMIC CONNECTIONS
    2.
    发明专利
    SWITCH AND ITS PROTOCOL FOR MAKING DYNAMIC CONNECTIONS 未知

    公开(公告)号：CA2023616C

    公开(公告)日：1995-05-16

    申请号：CA2023616

    申请日：1990-08-20

    Applicant: IBM

    Inventor： BROWN PAUL J ,  ELLIOTT JOSEPH C ,  FRANASZEK PETER A ,  HOPPE KARL H ,  LYNCH KENNETH R ,  SACHS MARTIN W ,  SKARSHINSKI LEON

    IPC: H04L12/56 ,  H04Q3/42

    Abstract: A dynamic switch and its protocol for establishing dynamic connections in a link by the use of frames, each frame having an identification of the source of the frame, an identification of the destination of the frame for the requested connection, and link controls to maintain, initiate or terminate a connection between the source and the destination. The frames are bounded by a start of frame delimiter and an end of frame delimiter which may also act as a connect link control and a disconnect link control, respectively, and the onnections are made through the dynamic switch having dynamic-switch ports. The state of a dynamic-switch port is changed dependent on its present state, the dynamic connection requested, and the direction and type of frames passing through the dynamic-switch port.

    BLOCK TRANSFERS OF INFORMATION IN DATA PROCESSING NETWORKS
    6.
    发明专利
    BLOCK TRANSFERS OF INFORMATION IN DATA PROCESSING NETWORKS 未知

    公开(公告)号：CA1156767A

    公开(公告)日：1983-11-08

    申请号：CA364528

    申请日：1980-11-12

    Applicant: IBM

    Inventor： BURK JOHN L ,  CORMIER ROGER L ,  HARTUNG MICHAEL H ,  LARNER RAY A ,  LUCAS DONALD J ,  LYNCH KENNETH R ,  MOORE BRIAN B ,  PAGE HOWARD L ,  WANSOR DAVID H ,  ZEITLER CARL JR

    IPC: G06F13/00 ,  G06F13/12 ,  G06F15/167 ,  G06F9/00 ,  G06F15/00

    Abstract: Secondary storage subsystems exchange messages and data with host data processing systems and also forward messages between host systems. Host systems thereby communicate with each other in addition to having access to data in subsystem storage. Access to subsystem storage is initiated by a "request" sent from a host to the subsystem. Each request is a message containing an array of one or more commands, each command specifying a transfer of data or a control function to be performed by the subsystem. A subsystem may process more than one request at a time. It also may process the commands in a request in an arbitrary sequence suited to the availability of subsystem resources and data links to host systems. After all commands in a request have been processed the subsystem transmits an associated "completion" message to the host system which originated the request. The completion message indicates the status of completion or abnormal termination of each command in the associated request. An "adapter" processor associated with each host and subsystem operates on an asynchronous basis to transfer messages and data relative to the associated host or subsystem. One or more processing "engines" in each adapter communicates with one or more CPU's in the associated host or subsystem through an associated "adapter store". A portion of each adapter store is used as a buffer pool for constructing "subchannel control spaces" to control transfers of messages and data. Elements of each subchannel control space are returned to free status as soon as they are not needed for sustaining associated transfers. PO9-78-012

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