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Oracle Assigned Patent

Multiple path load distribution for host communication with tape device

Oracle International Corporation, Redwood City, CA, has been assigned a patent (8,914,553) by Baker Charles, Conifer, CO, Zhang Miaohui and Li Xiao, Beijing, China, for a “multiple path load distribution for host communication with a tape storage device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A multiple port host communicates with multiple tape drives by requesting information associated with a particular tape. Information of availability status of a plurality of host ports is provided. Traversing all host initiator ports finds a host port with no or the least traffic load for a tape reservation request. A host port’s traffic load calculation uses instant and the updated historical traffic as primary and secondary factors. Every host port’s traffic load is updated for every read/write command, and is used for path selection of reservation requests. The instant load is relatively sensitive but will be zero under light load. The historical load is aware of the light load though it is not sensitive enough when a burst I/O occurs. With the traffic load calculated from instant and historical loads, the distribution of tape tasks is spread evenly among host initiator ports under light load and burst I/O scenarios.“

The patent application was filed on May 20, 2014 (14/282,091).

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