International Business Machines Corporation

John Dorfner

Aruna V Ramanan

Bret G Bidwell

Nathan A Besaw

Alison B White

Casandra H Qiu

Embodiments relate to setting up direct mapped routers located across independently managed compute and storage networks for enabling multiple modes of communication over the cross-coupled links between the networks. An aspect includes identifying a characteristic of a local entity based on a unique location identifier assigned to the local entity and learning a characteristic of a remote entity based on a location identifier received over a cross-coupled link between the local entity and the remote entity. A port on a local entity router is then correlated with the received location identifier of the remote entity. A route is then built in the direct mapped router table at a location pointed to by the location identifier of the remote entity. An optimistic failover route is established from a storage entity to a compute entity when a cross-coupled link between the storage entity and the compute entity is broken.

Set up of direct mapped routers located across independently managed compute and storage networks

Embodiments relate to providing communication over cross-coupled links between independently managed compute and storage networks. An aspect includes coupling an independently managed local subsystem with an independently managed remote subsystem over cross-coupled links, whereby each subsystem includes compute entities and storage entities. Unique identifiers are assigned to all the compute entities and the storage entities in the local network and the remote network. A determination is then made as to whether each entity is in the local subsystem or the remote subsystem. Accordingly, a global broadcast tree is built to bridge the compute entities in the local subsystem to the storage entities in both the local and remote subsystem. Responsive to an error in a layer of the local subsystem external to a cross-coupled link, the cross-coupled link in the local subsystem is disabled. Accordingly, the remote subsystem may detect that the link has failed.

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Rhinebeck, NY, United States of America

John Dorfner