H-series VM provide direct ibverbs access?

Igor Zablotchi 1 Reputation point
2020-05-17T18:55:29.803+00:00

I have a question about H-series VMs. I am considering renting a few instances for an experiment that requires RDMA.

For my experiment, I would need to be able to access RDMA directly through ibverbs, e.g., by posting a WR using ib_post_send and by polling a CQ using ib_poll_cq.

Is this possible with the H-series VMs? Or do they only provide RDMA indirectly, through MPI?

I read the documentation ( https://learn.microsoft.com/en-us/azure/virtual-machines/sizes-hpc) but it does not seem to answer my question.

Thank you!

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  1. prmanhas-MSFT 17,901 Reputation points Microsoft Employee
    2020-06-09T14:32:04.463+00:00

    @IgorZablotchi-1793 Apologies for the delayed response.

    H series support RDMA configuration. H-series features 56 Gb/sec Mellanox FDR InfiniBand in a non-blocking fat tree configuration for consistent RDMA performance. H-series VMs support Intel MPI 5.x and MS-MPI.

    You can refer to below article for more information:

    https://learn.microsoft.com/en-us/azure/virtual-machines/h-series

    The role of the libibverbs library has been taken over by a new package called rdma-core and hosted on github. A multitude of different RDMA packages were pulled together to make the rdma-core package, and all of the components that went into it are not obsolete. Users should transition to the new rdma-core package to get ongoing development and support.

    https://azure.microsoft.com/en-in/blog/azure-linux-rdma-hpc-available/

    Please 'Accept as answer' if the provided information is helpful, so that it can help others in the community looking for help on similar topics.

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