vSphere Hypervisor

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  • 1.  Does vmnic support 25G of bandwidth in ESXi?

    Posted Nov 10, 2020 01:07 PM

    The physical server is connected with 25G of network adapter and twinax cable. The question is would vmnic of ESXi support 25G of the bandwidth? I checked in the VMware documentation but didn't find much detail on it.



  • 2.  RE: Does vmnic support 25G of bandwidth in ESXi?
    Best Answer

    Broadcom Employee
    Posted Nov 10, 2020 01:31 PM

    Checked that the adapter is supported?

    https://www.vmware.com/resources/compatibility/search.php?deviceCategory=io

    If it is, ESXi should take advantage of whatever capabilities it has.



  • 3.  RE: Does vmnic support 25G of bandwidth in ESXi?

    Posted Nov 18, 2020 08:57 AM

    Just as a side note when you have this running - If you're using 25Gbit adapters for vSAN you may find that you do not get a full 25Gbit reading when you do the performance test in vCenter.

    From what I've read this is down to a single thread limitation in iometer which is what vCenter uses to do the test (you'll probably see around 9000Mbit). The actual bandwidth available to vSAN should be unaffected in practice and run at the 25Gbit speed.