Recovery method and system for continued I/O processing upon a controller failure
US6052795A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1996 |
| Grant date | Apr 18, 2000 |
| Priority date | — |
| Expiry date | Oct 29, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2007
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In an external storage, an I/O process continues without any intervention of a user of a host system upon failure of a controller. When a failure occurs in a controller, a host system recognizes the failure of the controller. Before the failure is notified to the user and application program to stop the job, the substitute controller reads the SCSI-ID possessed by an SCSI port of the failed controller from a shared memory, registers the SCSI-ID of the SCSI port to the SCSI port associated with the substitute controller, and erases by a port address resetting facility of the substitute controller the SCSI-ID possessed by an SCSI port of the failed controller. Due to such provision, since the SCSI-ID specified at issuance of an I/O request is transferred between the controllers, the user or the host system need not alter the I/O request issuing route.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.