Recovery method and system for continued I/O processing upon a controller failure
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United States of America Patent
Stats
-
Apr 18, 2000
Grant Date -
N/A
app pub date -
Oct 29, 1996
filing date -
Oct 30, 1995
priority date (Note) -
In Force
status (Latency Note)
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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.
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