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  • 1.  Edit VMkernal adapter causes connectivity issues?

    Posted Mar 17, 2023 03:28 PM

    Not sure where to post this, so Mods feel free to move it to the appropriate place.

    Question: If I add "vmotion" to a vmkernal adapter that's being used for an iscsi connection to a nas, will it cause an outage between the VMs that are currently running and the nas? If so, for how long?

    Background: I just tried this, and at the last step I get a dialog that pops up and says:


    (In case the screenshot doesn't appear above, it says: "Edit VMkernel Adapter: This vmkernel adapter is bound to an iSCSI initiator. Changing its settings might cause connectivity issues with the associated iSCSI host bus adapter.")

    That's a little vague, so I'm looking for clarification. 

  • 2.  RE: Edit VMkernal adapter causes connectivity issues?

    Posted Mar 18, 2023 05:09 PM

    Best practice is to have a dedicated LAN for iSCSI traffic and not share the network with other network traffic. It is also best practice not to oversubscribe the dedicated LAN

    Please go through this docs


  • 3.  RE: Edit VMkernal adapter causes connectivity issues?
    Best Answer

    Posted Mar 18, 2023 06:57 PM

    kindly use a separate network stack for iscsi traffic.

    • It's recommended to have all the vmk stacks on differenVLANan.
    • Using the same stack for multiple purposes will cause latency and threshold.
    • Also for storage-specific, its even recommended to dedicate the vmnic for that traffic to avoid latency 

    Further Info:



  • 4.  RE: Edit VMkernal adapter causes connectivity issues?

    Posted Mar 22, 2023 05:47 PM

    Thanks to both of you for replying! In my position, our vmware infrastructure is almost 100% "set it and forget it", so it's been a while since I've been in this scenario.

    Adding a new vmkernal to another virtual switch was the answer. I got that setup and tested a live vm migration with a test vm that I built, and dropped zero packets. Now I can confidently schedule a time to get the rest of the production VMs migrated.