Emc IP Holding Company LLC

Richard Goodwill

Douglas Eric LeCrone

Larry W McCloskey

Bhaskar Bora

Martin Feeney

Toufic Tannous

Writing new data to a tape volume of a tape emulation unit includes determining if the new data is an update to data that was previously written, writing the new data to a new section of the tape emulation unit in response to the new data not updating data that was previously written, deleting the data that was previously written and writing the new data to a new section in response to the new data updating data that was previously written, the new data being larger than the data that was previously written, and the underlying file system not supporting variable size records/blocks, and overwriting the data that was previously written in response to the new data updating data that was previously written and either the new data not being larger than the data that was previously written or the underlying file system supporting variable size records/blocks.

Concurrent tape modification

Replicating data written to a local storage device from a host includes receiving the incoming data using a first director that mirrors the incoming data from the first director to a second director independently of any links that transmit data to or from the directors and other components of the local storage device and transmitting the mirrored data from the local storage device to a remote storage device. The first director may be a target device (e.g., FICON target) that accepts data and connection requests from the host. The second director may be an initiator device (e.g., FICON initiator) that provides data and connection requests to the remote storage device. The second director may emulate a FICON initiator. The local storage device may wait for an acknowledgement of receipt of the data from the remote storage device before acknowledging receipt to the host.

Parallel input/output (I/O) replicating incoming data emulating fiber connection (FICON) in shared memory

Architectures and techniques are described that can address challenges associated with engaging a procedure that has the potential to produce beneficial effects in some case and detrimental effects in other cases. One example can be engaging an early IO (EIO) protocol in a synchronous remote data facility (SRDF), but only when doing so will have a positive impact on performance and/or response times.

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Richard Goodwill