Providing increased availability of I/O drawers during concurrent I/O hub repair

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.