• This topic has 3 replies, 4 voices, and was last updated January 28, 2021 by Kalsang D.

VMXNET3 DirectPath I/O Enabled

  • We have ESXi 6.5 in our environment.  We’re looking at turning off DirectPath I/O for any VMXNET3 adapters.  The VRA’s have it enabled.  Is that by design?  It is a ‘bug’ and turns on by default so we manually turn it off on our VM’s that we create.

    Hello,

    Contara from Zerto Support.

    The VRA is deployed with a VMXNET3 adapter, which is a 10 Gbps vNIC. A VRA cannot utilize multiple vNICs to improve throughput. This means that a single VRA is bound to 10 Gbps, or 1,250 MBps as a theoretical maximum.

    Thank you.

    Hi Contara,

    Being that the VRA is limited to one vNIC, it seems DirectPath I/O is turned on by design to provide better performance? Looking for clarification. Thanks!

    Hi,

    This is Kalsang from Zerto support.

    Yes, DirectPath I/O is turned on by design to provide better performance.

    Best regards,

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