Method and apparatus for performing control unit level recovery operations
US5423026A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 1991 |
| Grant date | Jun 6, 1995 |
| Priority date | — |
| Expiry date | Sep 5, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/142
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.