Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2011-01-04
2011-01-04
Lohn, Joshua A (Department: 2114)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
C714S006130, C714S006130
Reexamination Certificate
active
07865766
ABSTRACT:
A mechanism is provided for increased availability of input/output (I/O) drawers during concurrent I/O hub repair. The illustrative embodiments provide an alternative cabling scheme between an I/O planar and a plurality of I/O hubs that facilitates the I/O drawers being available even when an I/O hub fails. With this cabling scheme, a hypervisor or other virtualization mechanism configures routing tables in the firmware of the host system to cause data to be sent/received through the I/O hubs. In the event of a failure of an I/O hub, the routing tables may be updated by the hypervisor to utilize a different I/O hub coupled to the I/O drawer. By virtue of the modified cabling scheme of the illustrative embodiments, such updating of the routing tables allows I/O operations to continue at a single loop, or single barrel, throughput via the other I/O hub.
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Duron Mike C.
McLaughlin Mark D.
International Business Machines - Corporation
Lammes Francis
Lohn Joshua A
Toub Libby Z.
Walder, Jr. Stephen J.
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