公开(公告)号：CA1176379A

公开(公告)日：1984-10-16

申请号：CA403594

申请日：1982-05-21

Applicant: IBM

Inventor： CORMIER ROGER L ,  DUGAN ROBERT J ,  GUYETTE RICHARD R ,  WANISH PAUL J ,  ZEITLER CARL JR

IPC: G06F13/12 ,  G06F13/14 ,  G06F13/40 ,  G06F15/177 ,  H04L69/14 ,  G06F3/04

Abstract: PO9-79-010 METHOD FOR ESTABLISHING VARIABLE PATH GROUP ASSOCIATIONS AND AFFILIATIONS BETWEEN "NON-STATIC" MP SYSTEMS AND SHARED DEVICES Multiprocessing systems having changeable CPU configurations generate unique changeable identifications (ID's). These are presented by I/O channels over various I/O connection paths, in association with special path defining commands and function data. Related path state indications are stored peripherally in path map tables and define path group associations for sustaining path-independent I/O operations. When a device is reserved via one path in a path group the reserve affiliation is extended automatically (in the path tables) to each path in the group, thereby rendering each path accessible in a reserved mode. The path defining commands are used for adding paths to, resigning paths from and disbanding groups. Special sensing commands axe used for sensing path reservation and grouping states. When a command for adding or resigning a path is presented to a reserved device via one path in a group the reserve is automatically realigned to the enlarged or reduced group. When a command for disbanding a group is presented to a reserved device the reserve is realigned to apply only to the path on which the command is presented. The foregoing special commands are required to be obeyed by the device even if it currently has a conflicting allegiance to the same system or another system. Consequently, paths can be added to an established path group without requiring potentially premature release of any allegiance.

公开(公告)号：CA1175573A

公开(公告)日：1984-10-02

申请号：CA413263

申请日：1982-10-12

Applicant: IBM

Inventor： CORMIER ROGER L ,  DUGAN ROBERT J ,  GUYETTE RICHARD R ,  HANKISON RONALD L ,  HAO MING C ,  LEVIN ARTHUR L ,  MCCLAIN GEORGE A ,  WANISH PAUL J ,  ZEITLER CARL JR

IPC: G06F3/00 ,  G06F11/34 ,  G06F9/00 ,  G06F15/00

Abstract: P09-78-018 METHOD AND APPARATUS FOR MEASUREMENTS OF CHANNEL OPERATION A channel for a data processing system is provided with a time of day clock that is synchronized with the time of day clock of the associated central processor. Both the central processor and the channel processor record times of particular events, and the channel uses these times to calculate two times called Function Pending and Function Active. Both times begin when the central processor executes an instruction to begin an I/O operation. Function Pending ends when the channel has made successful initial selection. This time shows delays by the channel processor in scheduling the channel resources for I/O operations. Function Active ends at Channel End. A new instruction, Set Channel Monitor, enables or disables these measurements. An information block for each subchannel defines one of several measurement modes for a subchannel or disables the subchannel from measurement.