Hewlett-Packard Development Company, L.p.

Ramesh VelurEunni

Michael R Krause

Viswanath Subramanian

An apparatus in an example comprises an RDMA (Remote Direct Memory Access) network adapter located at an interface of a requester node coherency domain that sends an RDMA read request to a responder node coherency domain to flush into the responder node coherency domain data previously sent by the RDMA network adapter.

Remote direct memory access (RDMA) completion

A local RDMA (Remote Direct Memory Access) network adapter that comprises a simplex switchless connection with a counterpart QP on a remote RDMA network adapter in an example is selected for a Queue Pair (QP). An apparatus in an example comprises a requester RDMA (Remote Direct Memory Access) session fail-over coordinator on a coherency domain that adds a session fail-over header to a front of a data payload sent by an RDMA computer program from the coherency domain. Upon termination, of an RDMA adapter not coherent with the coherency domain and in a communication path of the data payload, before delivery to the RDMA computer program of a receive completion notification for the data payload, the session fail-over header is employable by a responder RDMA session fail-over coordinator to reconstruct the receive completion notification.

RDMA QP simplex switchless connection

In an embodiment of the invention, an apparatus and method for Remote Direct Access Memory (RDMA) copy-on-write perform the steps including: marking a page of a first application as copy-on-write when the first application and a second application share the page, and exposing the page via RDMA protocol to a remote application; in response to a write access message to the page from the remote application, dropping the write access message; and stalling the first application while a copy-on-write processing is pending, in response to the write access message to the page from the remote application.

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Santa Clara, CA, United States of America

Ramesh VelurEunni