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IgorZablotchi-1793 avatar image
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IgorZablotchi-1793 asked ·

H-series VM provide direct ibverbs access?

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://docs.microsoft.com/en-us/azure/virtual-machines/sizes-hpc) but it does not seem to answer my question.

Thank you!

azure-virtual-machines
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@IgorZablotchi-1793 Any update on this?

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prmanhas-MSFT avatar image
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prmanhas-MSFT answered ·

@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://docs.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/


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