hyper-v network managementOS checked or not ?

matteu31 826 Reputation points


I would like to understand better how hyper-v network works.

I have 8 NICs on my hyper-v server
4 * 10 Gbs and 4 * 1 Gbs

2*10 Gbs are reserved for datacore
2*10Gbs are reserved for cluster (csv / live migration / heartbit)
4*1Gbs are reserved for management OS + VM network

so I have :
1*10 ISCSI1 (datacore)
1*10 ISCSI2 (datacore)
Team 2*10Gb cluster with 3 virtual network (csv / live migration / heartbit)
Team 4*1Gbs with 1 virtual network LAN

I use the script provided here : scripts-hci-hyperv

on the file vSwitch Setup.ps1

He creates all virtual adapter with option managementOS.

I don't understand why is necessary for other network than LAN.

I would allow it only on the LAN because my management network is only on this vnic.

Thanks for your answer

A Windows technology providing a hypervisor-based virtualization solution enabling customers to consolidate workloads onto a single server.
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  1. Xiaowei He 9,751 Reputation points


    If the Hyper V host wants to continue using the physical NIC after the physical NIC bind to an external virtual switch, we should select the option "Allow management operating system to share this network adapter".

    According to your description, other networks seem to be designed for Hyper V host use, so if we use these NICs to create external virtual switch, we should select option "ManagementOS", if not, the Hyper V host can't use the NICs for ISCSI network or cluster network.

    Below is an article about the detailed explanation of "Allow management operating system to share this network adapter", for your reference:


    Thanks for your time!
    Best Regards,


    If the reply could be of help, please help to accept it as an answer, thanks for your cooperation!

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  1. Dave Patrick 339.9K Reputation points MVP

    It isn't necessary in all cases. Use the option only when you want to host OS to share the vSwitch (adapter).

    --please don't forget to Accept as answer if the reply is helpful--