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Hyper-v

Cannot boot a converted Gen 2 VM

I converted a VMWare Workstation 14 VM to Hyper-V (vhdx). Although I can boot and use it in a Gen 1 Hyper-V VM, I cannot get it to work in a Gen 2 VM.

My understanding is booting to a SCSI disk is not possible via Hyper-V, when although this worked in VMWare. I am then limited to booting a Gen 1 VM using IDE controllers. In a nutshell…is there going to be a performance hit here? Would I recognize any performance
lagging compared to using this same vdisk in a VMWare-based VM?

In research, someone created a Gen 1/Gen 2 conversion script 5-6 years ago…a) will it still work with today’s tech/software, b) is it necessary to do a conversion?

Basic VM characteristics…

2 processors
4GB RAM
45GB disk

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HyperV: How to enable/disable RCT (changeTracking) using WMI ?

Hi Experts,

With WMI, there is a way to query and get the changedblocks using WMI but Is there a way to enable/disable RCT using WMI ? 

With Win32 API, there are API functions to perform these operations but i am looking for WMI methods that can enable/disable/getRctState.

- Balu

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WIndows VM Backup happening with network disconnection

Virtual Machine : Windows Server 2012 R2

Backup Tool : Commvault

Cluster in which the VM is running - Microsoft Failover Cluster 2012

Issue Description : The Windows VM is with simple configuration with 1 OS disk and other a secondary disk. Both disks are presented to the VM from CSV. In addition to these disks, 3 command device disks are mapped using virtual fibre channel enabled in the
HyperV host. So, using this virtual machine configuration, the VM cannot be live migrated to other nodes.

During the time of backup, this VM is moving to save state and then it is getting restored automatically. Backup is getting successful. Since the machine is going to save state and getting restored, there is a brief disconnection of the VM network. We are
getting about 10-15 Request timed out during this backup process.

Is this happening by design, as we have the command disks, attached to the VM using the virtual fibre channel? or is there a work around for a VM with such configuration to initiate backup without downtime. Please help

 

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VmHostAssignableDevice of a PCI device to a 32-bit Guest OS

Hi,

Whenever I try to set over PCI-passhtru a PCI device to a 32 bits Guest VM (Linux Guest, Windows 7 Guest), if the VM is a 32 bit instance, the device is not enumerated and it does not show up into the guest.

For the same hyper-v configuration, but running a 64 bits Guest VM (Linu, Windows 10), then the device is enumerated and the drivers of the VMs can probe it.

Please, why does Hyper-v cares if the VM is 32 bits or 64s for PCI Passthru ? Are they are tuning with Hyper-v PCI enumartion when one needs to leverage PCI-passhtru ?

thank you,

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Windows Server 2016 HyperV – SuSe SLES12 SP2 Guest machine’s network adapter settings not aligned with windows host

Hi,

My Windows server 2016 HyperV SuSe Guest SLES12 SP2 machine’s network adapter settings are not aligned with the physical network adapter settings in windows server 2016 host, i.e.  in hyperv SuSe SLES12  guest machine is showing "Unknown"
Duplex 
and Auto-negotiation=off, but in windows server 2016 host, the physical adapter is showing Full duplex mode and auto negotiation is ON.   Is there a way to make these two network settings parameters in
SuSe HyperV guest machine align with windows Host  network adapter settings ?

[HyperV SuSe SLES12 SP2 Guest machine network adapter settings]

> sudo /sbin/ethtool eth0

Settings for eth0:

        Supported ports: [ ]

        Supported link modes:   Not reported

        Supported pause frame use: No

        Supports auto-negotiation: No

        Advertised link modes:  Not reported

        Advertised pause frame use: No

        Advertised auto-negotiation: No

        Speed: 100Mb/s

        Duplex: Unknown! (255)

        Port: Other

        PHYAD: 0

        Transceiver: internal

        Auto-negotiation: off

        Link detected: yes

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Hyper-V Networking Issue : DHCP grabs a correct IP address / Gateway / DNS but no traffic, cannot ping gateway

Good morning,

I am having an issue with my main hyper-v host.  Last week my virtual servers on this host all started getting the yellow ! and we could not ping / communicate with the server.  I rebuilt the Virtual Switch, verified it was attached to all my virtual
servers/clients, all fired away with no issues.  

This morning, after the weekend, same thing.  My main SCCM server has the yellow ! and I cannot ping it or talk to it anywhere on my network. 

The odd thing is, I took the static IP out of the network adapter and set it for DHCP and it grabbed a valid IP/gateway/DNS/etc…but it cannot talk to anything.  I made sure the "Allow management operating system to share this network adapter"
was checked…it still is.  

Any ideas/pointers for me to try?

Thanks in advance!

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Hyper-V Networking Issue : DHCP grabs a correct IP address / Gateway / DNS but no traffic, cannot ping gateway

Good morning,

I am having an issue with my main hyper-v host.  Last week my virtual servers on this host all started getting the yellow ! and we could not ping / communicate with the server.  I rebuilt the Virtual Switch, verified it was attached to all my virtual
servers/clients, all fired away with no issues.  

This morning, after the weekend, same thing.  My main SCCM server has the yellow ! and I cannot ping it or talk to it anywhere on my network. 

The odd thing is, I took the static IP out of the network adapter and set it for DHCP and it grabbed a valid IP/gateway/DNS/etc…but it cannot talk to anything.  I made sure the "Allow management operating system to share this network adapter"
was checked…it still is.  

Any ideas/pointers for me to try?

Thanks in advance!

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i am installing Windows server essentials 2019

I have would like to know the following

1 if i install the host do i allocate the whole 4 TB drive that i set up using raid 1 or do i create 2 partitions?

2 Once i have installed the essentials on the host, how many virtual guests can i install ?

can i install a domain on one vm

file shares on another

and dhcp on another

or do i just install the domain controller on the one virtual machine with all the services?

Essentials has limitations, but i only have 10 users on it.  they need to share specific files, but not all users 

are allowed access to all the files.

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Cannot Create External Network on VLAN Based NIC

The NIC is an Intel I211 which has 2 VLANs on it.  If I try to bind one of the VLAN interfaces to an external network I get an error.  If I remove the 2 VLAN interfaces and try to create a virtual switch it is created.

[Main Instruction]
Error applying Virtual Switch Properties changes

[Content] Failed while adding virtual Ethernet switch connections.

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Hyperv OS 2019 vs Veeam vs checkpoints

Hey.

dunno if this is Veeam related problem or hyperv, here’s the story.

Hyperv server - 2012 R2 with three VMS (2 linux machines and one OS 2016 VM).

Created a new server OS 2019 with hyperv role installed.

Turned off virtual machines on 2012R2 and live migrated to hyperv 2019.

Installed veeam backup and replication on OS 2019 and configured daily backups of virtual machines.

It works for 2-3 days then it stops working with an error about checkpoints.
I think it’s hyperv issue and not veeam issue.
For example if I want to edit disk on a virtual machine it’s greyed out stating that checkpoints exists (but there are no checkpoints?!?). Creating checkpoints manually not working, throwing an error.

But if we reboot Hyperv OS 2019 server then everything is OK. On VM settings we can edit the disk (it isn’t grayed out more). And backups are running with no problem.

Any clues?


BCR

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