Method and apparatus for performing control unit level recovery

Details Method and apparatus for performing control unit level recovery Method and apparatus for performing control unit level recovery

1991-09-05

1995-06-06

Beausoliel, Jr., Robert W.

Excavating

371 12, G06F 1100

Patent

active

054230268

ABSTRACT:
Control unit level reset operations in systems having switched point-to-point I/O interface topologies is accomplished by determining and storing channel path identification numbers (CHPID's) and control unit link addresses (CULA's) for each device in the system, scanning this stored data to find devices whose CHPID's and CULA's match the CHPID and CULA for a device or a control unit having a reported error, quiescing devices with such matching CHPID's and CULA's, issuing a control unit level reset command and reactivating the quiesced devices. For systems having both multidropped and switched point-to-point topologies, provision is made for preliminarily determining whether a given control unit reset can be performed on the control unit level.

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