International Business Machines Corporation

Jeffrey Michael Barnes

Matthew J Kalos

Michael T Benhase

Kevin J Ash

Gail Andrea Spear

Carol Santich Mellgren

Shachar Fienblit

Steven Edward Klein

Jared Michael Minch

Stephen M Tee

Nicholas S Ham

Gary Steven Domrow

Techniques for switching between mirrored volumes are described. A system may comprise a multi-path device driver and a processor device, in communication with the multi-path device driver, operable in the computing storage environment. The processor device creates a copy relation identification (ID) between mirrored volumes for using the copy relation ID in conjunction with a multi-path device driver for switching input/output (I/O) for applications between a first path to a second path between the mirrored volumes.

Switching between mirrored volumes

A method to maintain write operation atomicity where a write operation crosses a data storage medium track boundary. The method supplies a storage controller comprising a host adapter, a processor, and a NVS. The host adapter receives from a host computer a write request and data. The method determines if the write request will cross a data storage medium track boundary. If the write request will cross a data storage medium track boundary, the method indicates to the host adapter that the write request comprises a two-track transfer, and writes the data to the NVS as the data is received. If the host computer fails prior to providing all the data to the storage controller, the method discards the data written to the NVS to ensure write operation atomicity.

Apparatus and method to maintain write operation atomicity where a data transfer operation crosses a data storage medium track boundary

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Tucson, AZ, United States of America

Jeffrey Michael Barnes