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Wim Matthyssen

My journey with the Microsoft Hybrid Cloud

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Azure Backup Hyper-V VMware


HOW TO FIX HYPER-V EVENT ID ERRORS 41, 15340 AND 15350 WHEN RUNNING THE HYPER-V
ROLE ON A VMWARE VM

by wmatthyssen
August 18, 2021






These days you can install Microsoft Azure Backup Server (MABS) v3 on a server
running Windows Server 2019 Datacenter (or Windows Server 2016 Datacenter) ,
which can be a Hyper-V virtual machine (VM), a VMware VM, a physical host, or
even an Azure VM, to backup your on-premises or Azure workloads. To be able to
perform item-level recovery of VMs (recover files, folders and volumes), one of
the requirements is that you install the Hyper-V role and the Hyper-V PowerShell
feature as a prerequisite.



When running Hyper-V inside a Hyper-V or VMware VM you will be using nested
virtualization. If you want to read more about this feature you can do so over
here






ISSUE



During the installation of a new MABS v3 on a VMware VM (ESXi 7.0.2), and after
the Hyper-V role was added, the following errors showed up in the Hyper-V event
log: Event ID 41, Event ID 15350 and Event ID 15340.

For example, event with ID 41 showed the following error message:

Hypervisor launch failed, Either VMX not present or not enabled in BIOS.






While running the Get-WindowsFeature command on the VM showed that Hyper-V was
installed correctly, in the end this was not completely the case like all
previous errors showed.








SOLUTION



To fix these errors and to get Hyper-V running like it should, I followed the
below steps:

First of all, shut down the VM (in my case I used the vCenter Server) and open
the Virtual Machine Settings. Then go the Virtual Hardware tab and expand the
CPU options.












There you need to check the box Expose hardware assisted virtualization to the
guest OS. Click OK to save.







When you still use an older ESXi version, like 6.5, you should also set CPU/MMU
Virtualization to Hardware CPU and MMU.






When you now start the VM, those specific Hyper-V related errors should be gone
(check with the current boot timestamp) and all necessary Hyper-V services
should be running as expected.








CONCLUSION



To be able to perform item-level recovery for virtual machines (recover files,
folders, volumes) with your MABS server, one of the prerequisites is that the
Hyper-V role is enabled. When you run your MABS on a VMware VM you should set
Expose hardware assisted virtualization to the guest OS on the virtual CPU to
make this possible.


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TagsAzure Backup • Hyper-V • MABS • Microsoft Azure Backup Server • VMware •
Windows Server • Windows Server 2019


ABOUT WMATTHYSSEN

Wim is an Azure Technical Advisor and Trainer with over fifteen years of
Microsoft technology experience. As a Microsoft Certified Trainer (MCT), his
strength is assisting companies in the transformation of their businesses to the
Cloud by implementing the latest features, services, and solutions. Currently,
his main focus is on the Microsoft Hybrid Cloud Platform, and especially on
Microsoft Azure and the Azure hybrid services.   Wim is also a Microsoft MVP in
the Azure category and a founding board member of the MC2MC user group. As a
passionate community member, he regularly writes blogs and speaks about his
daily experiences with Azure and other Microsoft technologies.

wmatthyssen.wordpress.com


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