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Unable to ping or UNC path from a 2012r2 physical hyper-v server to a 2012r2 physical Hyper-v server on a different sub net

October 31, 2018, 2:25 pm
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Hi Guys,

We have three hyper-v Windows 2012r2 DC servers. Two are on the same network which 172.16.64.0, the third is on network 172.16.128.0. The two hyper-v servers on Network 64.0 we'll call Hyper-v4 & hyper-v5 and the one on network 128.0 we'll call hyper-v10. All three servers NIC's are setup exactly the same way. 

From any server on Network 128.0 we can ping any server on Network 64.0 and use UNC paths to connect to any system. From any server EXCEPT hyper-v4 & hyper-v5 on network 64.0 we can ping any server on network 128.0 and connect using UNC paths. We also have a third network 192.168.220.0 that we can ping any server on Networks 64.0 & 128.0 as well as connect to using a UNC path. 

This is the problem we're having.

We can not figure out why the two Hyper-v servers on network 64.0 can't ping or do a UNC path to the Hyper-v10 server on network 128.0.

Any help would be greatly appreciated. 

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Hyper-V server CPU resource loading

October 11, 2018, 8:03 pm
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We have installed Windows server 2016 server with Hyper-V on Dell R430 server, 2x16 Core 32Threats CPU.  We have build 2 guest Windows 2012 servers for each have 16 vCPU only. 

We found that even the guest servers CPU running over 70%, the host server only have 1 core full loading and other CPU only have few% loading running.

Is that anything we set wrong? Or anyway we can make the balance CPU load on the physical host?

Thanks a lot

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Hyper-V Broken Parent Chain

October 31, 2018, 11:57 pm
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I have Windows Server 2016 Server running Hyper-V. I have one of the Hyper-V machines having snapshots has an issue. The snapshots are present and for some reason the parent file become unreadable while there was a server crash with blue screen. How can I restore the VM from the snapshots avhdx files?
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Hyper-V Server 2016 Replication Issues, stuck on Creating a reference point

November 1, 2016, 2:16 pm
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Hi all,

Config: 2 Node Cluster, with Windows SMB 3 Storage for VM's

I took the plunge, and migrated from Hyper-V Server 2012 R2 to 2016, and have had some fun and games on the way...  I've now got one major issue, and was hoping someone would shed some light on the issue:

Enable replication for a VM, whilst it is powered off.  Replication completes successfully.  When I power up the VM, changes are detected and replication kicks off to copy the changes to the replica.  At the same time there is a new "Creating a reference point" part which starts off, and this is where the issue is.... it is getting stuck there at around 50%.  I can't shut the VM down, power off doesn't work, can't kill the process, or shut the Host down, apart from a Physical power off.

Host Event Log Entry that ties in with the issue is:
'VMTEST01' timed out while waiting to perform the 'Cleaning up stale reference point(s)' operation. The virtual machine is currently performing the following operation: 'Creating a reference point'

I have tried a few different VM's, cleanly built, and they have the same issue.

The exact same setup on 2012 R2 worked perfectly.

Any ideas?


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Hyper-V Manager in Windows 2019 and Windows 10 1809 - 'turn off VM' no confirmation?

October 26, 2018, 12:52 am
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I know Server 2019 has been pulled, but I downloaded the ISO from VLK before it was pulled so we are still testing it. It was pulled because of the Windows 10 document issues, which has not anything to do with this issue.

In Hyper-V Manager, when I 'turn off' a VM, in both Windows 10 1809 and Server 2019 (with GUI) Hyper-V manager, there is no confirmation question anymore, which is potentially dangerous. The setting whether or not a confirmation should be asked used to be stored in "%appdata%\Microsoft\Windows\Hyper-V\Client\1.0\user.config";

        <setting name="NeedToConfirmFlag" type="System.Int32">
            <value>-1</value>
        </setting>

However that setting doesn't make any change anymore. Can anyone else confirm this before I create a ticket about that? Or might anyone know if there's a simple fix?

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Cannot change generation 2 vm's boot order

July 5, 2016, 12:29 am
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Hi,

I have following issue: I'm not able to change generation 2 vm's boot order. Neither Hyper-V Manager nor Powershell can do it:


On good host (all settings are correct):

Host where I'm not able to change settings:

Both servers are Windows 2012 R2 with all updates installed. I have found this thread: https://social.technet.microsoft.com/Forums/office/en-US/d1a5238e-b20f-4773-9ad6-253cae118f10/uefi-boot-order-options-missing-from-hyperv-host?forum=winserverhyperv but I cannot reinstall Hyper-V role (server is a part of production environment). Do you know how to fix this issue?

My LinkedIn profile

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Hyper-V Fails to enable replication between servers with error 0x00002EE2

November 1, 2018, 4:27 am
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I am running into an issue trying to enable hyper-v replication on Windows Server 2016.  I have tried via HTTP and HTTPS (AD signed certificates) and neither works.  The interesting thing is, I already have another VM replicating between the two servers so I know its possible.

The current error is: 

    [Main Instruction]
    Enabling replication failed.

    [Expanded Information]
    Hyper-V failed to enable replication for virtual machine 'VM2': The operation timed out (0x00002EE2). (Virtual machine ID 134E9F3F-XXXX-XXXX-XXXX-1AC608804212)

However this doesn't make sense as I can ping the server (ping works from both sides) and I can connect to port 80 and 443 from each side (VS1 and VS2) - note they are on different subnets however that shouldn't matter. Also both servers are part of the domain so authentication shouldn't be an issue (I am logged in as a domain admin and have a valid kerberos ticket) and there is nothing in any of the event logs that gives me any sort of clue as to what is wrong.

Anyone have any ideas of what might be wrong?

Shawn

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Help to on windows Server Install and link up with client

November 1, 2018, 11:06 am
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Hi Expert,

I wanted to do self-learning on Windows Server 2012/16 on Hyper V(VM) on my Windows 10 pro. I have created server and client but have many small issues on this and that, which I guess I did wrong, having done some google and video but become confusing for me. 

Like to check if any expert here has a guide or clear video for installing server and able to link up windows 7/10(VM) to the domain in Hyper V, thing like configure DHCP, DNS, AD and treat it like in a real-life company server in the Virtual server. I would like to practice on GPO, WUSU, AD and share drive. 

Much appreciate if any expert can assist me on.

Many Thanks!
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Live Migration Fails at 3% - SOLVED

July 20, 2017, 12:11 pm
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We recently setup a Hyper-V Fail-over cluster using (2) Dell R610 servers and a direct attached (SAS) Dell MD3200 storage array. The servers are identical: Xeon E5630 Processors, 64 Gbs of RAM.  The hosts are running Windows Hyper-V 2016. (so we are heavily Powershell dependent)  There are two networks cards, one integrated and one add-on. (4) of NICs (2 from each card) are NIC teamed for production network traffic, and (1) NIC on each server's integrate card is dedicated to Live Migration traffic. The Live migration subnet is on its own physically separate 1Gb network hardware (we are not 10gb capable). We are running 4 production VM's: DC, Appserver, Backup Server, File Server. We also have some test VMs.

When we first set the system up, Live Migration ran perfectly. We started having issues once we put load on the VMs. The exact issue is that when we attempt Live Migration of the production servers they fail at 3%. We receive a time out error message (see below). Every now and then the DC, Appserver, and Backup server will Live Migrate, but never the File Server (with 3Tb VHD). The inconsistency is killing us. The Test servers, with no real load, migrate fine.

We have plenty of available hardware resources, and have even dropped the specs of the VM's to the lowest possible (1gig RAM and 1 Proc) but they still time out. We use Fail-over Cluster Manager and Hyper-V Manager to administer the cluster; we are not usingSCVMM.

Error Message:

Live migration of 'Virtual Machine PRGFILESHARE' failed.

 

Virtual machine migration operation for 'PRGFILESHARE' failed at migration source 'PRGHYPERV1'. (Virtual machine ID F6F0B8CA-D100-4A7C-8115-AC09FC47125A)

 

Planned virtual machine creation failed for virtual machine 'PRGFILESHARE': This operation returned because the timeout period expired. (0x800705B4). (Virtual Machine ID F6F0B8CA-D100-4A7C-8115-AC09FC47125A).

 

Failed to receive data for a Virtual Machine migration: This operation returned because the timeout period expired. (0x800705B4).

RESOLUTION - Delete Checkpoints

It appears that the checkpoints we were taking daily on this server (and others) were causing the live migration issues. We had a script to take checkpoints (formerly called a Snapshot) every morning between 7am-8am and keep them for 5 days. During our troubleshooting we deleted all of the existing checkpoints, took a fresh one, and ran the live migration on the server that wasn't working. It worked perfectly. For servers that were successfully live migrating, but at a slow rate, this trick increased their live migration speed dramatically. While we're happy that everything works we don't understand why these checkpoints were causing the issue. We never tried to migrate while a checkpoint was being created and the checkpoint files were stored on the cluster shared volume not the host servers. If our understanding of live migration is correct, only the CPU and RAM information are being copied over. I have read that a shallow copy of the VM is copied over but I don't see how a static snapshot file would factor in.

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Hyper-V VMQ/RSS setting recommendation help

November 1, 2018, 10:29 pm
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I have a 2x8 core server with hyperthreading = 32 logical processors.

I have 8 10Gbe NICs.  All eight NICs will be in a SET Hyper-V switch on Server 2016.

I am trying to determine how to configure the processor affinities for RSS/VMQ.  The 'rules' seem to be:

  1. Don't use processor zero
  2. Don't overlap
  3. Don't span NUMA nodes

In the examples I've found online, they only use 2 NICs.  That's easy.  But I have 8 NICs and 16 cores (only 14 if you avoid core zeros).

Therefore, following the rules, I have two sets of {group of 7 processors to which to assign 4 NICs}

So what do I do?

  • Do I give 6 NICs 2 cores, and 2 NICs only 1 core?
  • Do I use processor zero and give all NICs 2 cores each?
  • Do I overlap the processors?  If so, how many cores/queue?
  • Something else?

If I only give each NIC 1 or 2 processors, then won't the underlying VM be constrained to the throughput of just 1 or 2 processors?

But, If I give each NIC all 7 processors, won't the first processor get overloaded?

I'm stuck, and I appreciate your advice.

-Tony

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Powershell Exports and Copys for Hyper-V

October 17, 2018, 6:44 am
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As far as I can tell if you do an export from Hyper-V using powershell it is not considered a dirty copy.  Can anybody find or have documentation that can verify this?

Thanks!

Trevor

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Checkpoint disk size

October 19, 2018, 10:33 am
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Dear Team,

Thanks in advance!

Me first time in Hyper-V area, while create a checkpoint of VM its size auto increase daily base. We couldn't find out what is the actual reason.

Kindly advise.

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Server2008R2 install VMGUEST error

October 21, 2018, 1:58 am
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Hi

I want to run a win 2000 VM in Server2008R2 Hyper-V ,but i can not install the VMGUEST,so i can not use mouse normaly.

If you had  same problem with me and how did you solve it？

Thanks


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Hyper-V Server 2016 VM UUID All Zeros - Need to Change UUID

October 23, 2018, 6:30 am
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We have an application that is dependent on a valid UUID for licensing purposes.

 

Newly created VMs all have the UUID set to all zeros:

  • wmic path win32_computersystemproduct get uuid
  • UUID
  • 00000000-0000-0000-0000-000000000000 

How can we change the VM UUID?

We are able to change the VM BIOS GUID, however the UUID is still all zeros.

Hyper-V host: Dell PowerEdge R720 | Windows Server 2016 Core (fully patched) with Hyper-V Role.

The host does have a valid UUID:

  • wmic path win32_computersystemproduct get uuid
  • UUID
  • 4C4C4544-0058-3610-8037-CAC04F4D4E32

 


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adding a software raid disk C, to a hyper-converged infrastructure

October 30, 2018, 3:33 am
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Hey Guys,

I have a 2 *LIVE* node S2D infrastructure, with storage pool configure and running,

one of the servers has only 1 SAS DISK used for OS, and we want to add a software raid for it,

my problem is:

once i add the physical disk to the server, it automatically joins it to the S2D storage pool, 

i used remove-disk from the storage pool, but i still cant see the disk from disk-part or disk management to configure software RAID mirror,

what am i missing,

Thank you,

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How safe is Hyper-V auto stop action "save state" when the host reboot?

November 2, 2018, 1:10 am
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Hi, I find that we have two Hyper-V host was set to auto-update Windows Update and reboot. We have a few VMs with legacy OS.  And how well will "Windows Server 2003" and "Windows Server 2008 R2" manage save state if the host reboot?

Hyper-V host OS Server 2012 R2 and Guest OS "Windows Server 2003" and "Windows Server 2008 R2"

/SaiTech

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Hyper-V Replica Capacity Planner stuck getting VM information

December 17, 2014, 6:29 am
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I'm trying to use the Capacity Planner for Hyper-V replica tool to estimate requirements for a replica site.

It keeps getting stuck "Getting the VM and VHD from primary site, this can take upto several minutes...". I've waited over an hour, and it still sits there.

The primary site is a 3 node Hyper-V 2012R2 cluster. I have installed and configured the Hyper-V Replication Broker role on the cluster. For now, it's set to use HTTP without any certificates.

I don't have a replica site yet, so I've selected "Skip tests involving Replica site". For the primary site, I've tried pointing it at both the replication broker, and at one of the individual nodes. It gets stuck in the same place.

Other things I've tried:

  • Disabled windows firewall on all 3 nodes
  • Running the tool from one of the nodes, logged in as a domain admin account
  • Moving all the VMs off of one node, and pointing the tool at that now empty node
  • Let it run for longer - left it alone overnight.
  • Downloaded the tool again in case it was corrupt
  • Rebooted my computer

In all cases, it gets stuck at the exact same spot.

Any idea how to figure out why it is freezing? Have I missed configuring something important for the tool to run?

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Unable to add disk to a 2 node Hyper-v cluster

November 2, 2018, 6:12 am
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Hi,

I am having issue with adding a Shared LUN to the cluster , the cluster fails to detect the disk

Below is my setup

2 Servers ( 2016 Datacenter ) - 2 node cluster

Shared disk 4TB ( LUN from EMC VMAX ) presented to both hosts and visible in disk management and file explorer

Can someone help with what I am missing ?

Thanks In advance

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Hyper-V build 1703 generation 2 PXE has faulty ARP implementation

June 23, 2017, 12:24 pm
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Since build 1703 came out for Windows 10 Enterprise x64, with Hyper-v enabled, the ARP protocol does not work correctly in a Gen2 vm during a PXE boot. The result is that the DHCP protocol does not work in a gen2 vm, and thus, pxe booting is broken in a gen2 vm on the 1703 build.

Host and guest are on subnet: 10.1.29.x /24
DHCP server IP: 10.1.1.3
PXE server IP: 10.1.1.3

Here is correct ARP behavior, on a gen1 vm, notice arp for default gateway mac address, and subsequent successful DHCP, then successful download from the WDS server at 10.1.1.3.

gen1-vmguest-1703host-ARP-correct

Here is the faulty arp behavior as found in a Gen2 vm on the same host as above.Notice the ARP protocol trying to get the mac address of a remote subnet IP. Anyone that understands the ARP protocol recognizes immediately that this can never work.

gen2-vmguest-1703host-ARP-failure

Somewhere during the 1703 dev cycle this ARP regression was introduced. This needs to be investigated by the developers as there is no way to "configure" how hyper-v's gen2 embedded PXE code implements the ARP protocol.

Please don't comment regarding "how to pxe boot in hyper-v" this PXE infrastructure is perfect. UEFI and BIOS based physical PCs on the 10.1.29.x subnet can PXE boot just fine from 10.1.1.3. Additionally, reverting the host hyper-v OS back to 1607 build, gen2 vms can successfully PXE boot. The ARP traffic change is the smoking gun for this regression.

This ARP bug is only present in build 1703, with a generation 2 vm.

Hope this is useful to help get this critical regression bug fixed.

-Ben

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How do I delete old VHD files off a hyper V host machine

August 8, 2013, 12:00 pm
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I have created several test VMs and moved a production VM away from a particular host machine.  the only remaining VM cannot start do to a lack of disk space.  there should be plenty, the problem is all of the old unused vhd files. But I cannot figure out how to delete them.  the Hyper-V Manager only allows me to select them.

I certainly have to be missing something simple.

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