System for switching between first and second control unit and b

Details System for switching between first and second control unit and b System for switching between first and second control unit and b

1990-11-19

1995-03-14

Lee, Thomas C.

Excavating

371 91, 3642283, 3642381, 3642382, 364DIG1, 395275, G06F 1120

Patent

active

053983297

ABSTRACT:
In a communication system having a plurality of host computers and two communication control processors (CCPs) connected to the respective host computers, one CCP is used as a regular CCP and the other CCP as a backup CCP. Each host computer establishes links with the two CCPs. Each of the host computers has a link flag for each link connected to each of the CCPs. The flag is set when the link is connected to the regular CCP. When the master host computer detects failure of the regular CCP, the master host computer sends an activate node request to the backup CCP to indicate that the backup CCP should be activated. Upon reception of the activate node request, the backup CCP sends a change output link request to all of the host computers. Upon reception of the change output link request, each of the host computers sets the link flag corresponding to the backup CCP to deal with the backup CCP as a regular CCP.

REFERENCES:
patent: 4396984 (1983-08-01), Videki, II
patent: 4747130 (1988-05-01), Ho
patent: 4775976 (1988-10-01), Yokoyama
patent: 4837680 (1989-06-01), Crockett et al.
patent: 5119488 (1992-06-01), Takamatsu et al.
HITAC Manual, "Program Product VOS3 Communication Management SNF, Introduction and Practical Use", 8090-3-172, 63-7, 1988 (English translation unavailable).

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