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Recover VHDX - Cannot mount

January 13, 2019, 8:18 pm
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Hello,<o:p></o:p>

We had experienced a virtual machine crash, and the virtual machine could no longer boot.<o:p></o:p>

Host:  Windows Server 2012 (Hyper-V host)<o:p></o:p>

Guest VM:  Windows Server 2012<o:p></o:p>

I then made a copy of the virtual machine and configuration to attempt recovery from a Windows Server 2016 for recovery.<o:p></o:p>

I tried to use the Inspect Disk function on the .AVHDX file, which then it asks to Inspect Parent disk.  Once I try to inspect the parent disk, the same error occurs where it says the parent .VHDX is corrupt.<o:p></o:p>

“An error occurred when attempting to retrieve the virtual hard disk<o:p></o:p>

…\VM_Disk_0_HD_E6701573-EB9F-413… on server UNIREC.<o:p></o:p>

Failed to get the disk information.<o:p></o:p>

An unexpected error occurred: The file or directory is corrupted and unreadable. (0x80070570).<o:p></o:p>

Failed to get the disk information.<o:p></o:p>

The Hyper-V Virtual Machine Management service encountered an unexpected error: The file or directory is corrupted and unreadable. (0x80070570).”<o:p></o:p>

<o:p> </o:p>

EventID 27000 is logged in the Hyper-V VMMS storage log with the following error:<o:p></o:p>

Failed to open attachment 'E:\Hyper-V\virtualboot\VM_Disk_0_HD_E6701573-EB9F-4131-AC77-89C05EC878AC.vhdx'. Error: 'The file or directory is corrupted and unreadable.'.<o:p></o:p>

Any help would be appreciated!

Thanks!

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Server 2019 VMs on Server 2016 Hyper-V hosts?

October 4, 2018, 3:09 pm
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Will Server 2019 vms run on Server 2016 Hyper-V hosts?

Orange County District Attorney

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Hyper-V / Server 2016 host is crashing when VMs start for first time

January 9, 2019, 11:01 am
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Like the title says, We are having an issue with our hyper-v host servers crashing on the initial startup of guest vm's. 

Everything works fine during the creation of the guest vm, then when we go to power up the guest vm about 10-20 seconds later the host crashes. Doesn't happen on every vm setup, but quite a few (say 1/3). 

I have found examples of others having the same issue or similar. See https://www.youtube.com/watch?v=ytP-RfhdBWY  (not my video, but same sort of issue).

I haven't seen anything in event viewer that would indicate a problem with the host. no crash logs are saved when it does crash, just a hard black screen (no BSOD). 

Any thing you guys can point me to look for here? I am at a total loss on this. 

Thanks,

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Can Server 2019 Hyper-V Core be used?

January 9, 2019, 2:09 am
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we want to build our new cluster with Server 2019. Is it possible to use the following ISO or has not the Hyper-V core version been officially released yet?
17763.1.180914-1434.rs5_release_SERVERHYPERCORE_OEM_x64FRE_en-us.iso
In our VLSC I could only find Datacenter, Standard and Essential.

I know of an RDP problem with the Hyper-V Core. We could live without RDP because we mainly work through Remote Powershell

What I have seen when testing is that no Monthly updates are displayed in the update search on sconfig. I had to install this manual. Is this normal?

Best Regards,
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Remote Management of UPD's in Server 2016 Hyper-v Environment

December 27, 2018, 3:44 am
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Good morning all

  We are running a Hyper-V RDSH environment with 13 hosts and approx 600 Users  (400max at any one time) and on occasion we have a user that will disconnect from a session and although they logoff after 60 mins idle time, the User Profile Disk will stay connected to the host and therefore the users will not be able to log back in.

At the moment we use "Sidder" to retrieve the SID for the affected user and then have to login to each node and use diskpart to list Vdisk and find the user. Launch Disk Management and manually disconnect the Disk. 

I cannot help thinking there is a more efficient way to do this but i am lacking the powershell skills to do this. (The first attempt via Powershell disconnected 30 user profile disks and caused a little chaos)

I have read that Vdisks cannot be listed remotely, but they can be disconnected via Computer Management?

We have no crippling restrictions for remote management of the Sessions/Hosts.

Is there a way to do this in a more efficient way?

Thank you and Happy New Year to you all.

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Windows 10 VMs not showing interactive session from console but Windows 7 VMs do? Also VM locks when workstation locks?

December 6, 2018, 11:52 am
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Hello

1. When using Hyper-V manager to connect to our server we can see the Win7 VMs when someone is logged into them. We only see the lock screen on Win10 VM when someone is logged in.

2. If the workstation running Hyper-v manager locks and someone else has a remote connection running inside the Hyper-V Win10 VM, that connection is affected. This does not occur in the Win7 VMs.

I compared VM level settings and am not seeing anything different short of storage location. I assume it is an OS related setting.

Any help is greatly appreciated. Thanks in advance.

~Nick

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Slowness on hyper-v host

January 12, 2019, 5:56 am
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HI All.

On some Hyper-V nodes, we have observed significant performance slowness compared to other nodes running in the same cluster. The performance is most noticeable . we mo moved the VMs the reside on this host to another host it works fine and fast

any help plz 

IT Helpdesk

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Unable to expand VHD on Win 2012 R2 HyperV due to checkpoint

January 15, 2019, 8:24 am
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Hi Team,

I have a critical file server running on Windows server 2012 R2 two node Hyper V cluster, one of the data volume is running out of space, when i tried to expand the VHD the edit option is grayed out like shown in the below screenshot.

I read some articles which says if there is a checkpoint available on the VM,i will not be able to edit the VHD, as you can see there is a checkpoint taken on 12/01/2018 


I am worried if i delete the checkpoint , will i loose data , my question are as below.

1) Will deleting the checkpoint allow me to edit and expand the VHD is the checkpoint preventing me from expanding the VHD?

2) What is correct way to delete the VHD?

3) Will there be a data loss if i delete the VHD?

Regards


TechGUy,System Administrator.


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I have a hyper-V CentOS(7.7.1810) guest, but not able to see that in full screen

January 5, 2019, 1:06 pm
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Hi,

I have a hyper-V CentOS(7.7.1810) guest, but not able to see that in full screen. What am i missing ? 

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Hyper-V host and VM sometime stop responding and not coming back until turn it off and back on

January 15, 2019, 3:43 pm
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Hello,

We have been having this issue for years and have no clue how to solve. 

We have several Hyper-V hosts (Physical HP servers running Windows server 2012 R2 ) on premises and have around 2-4VMs sitting on each host server. These host servers and VMs sitting on them sometimes stop working.

the issue is the following:

When the issue happens to host, the host suddenly stops responding (unable to access shared folder, RDP and other services) but still pigable. VMs sitting on the problematic host is still functioning like normal. 

When the issue happens to VMs, the VM suddenly stops responding (unable to access shared folder, RDP and other services) but still pingable.

When the issue happens to VMs, I still can see "Press Ctrl+Alt+Delete to sign in" screen from the Hyper-V console but unable to log in,

When this happens, I cannot do anything so I turn the VM off from Hyper-V console (if we shut it down  from Hyper-V console, it will stuck for 10-20 mins and give us an error). when this happens to a host server, I just do a hard shutdown.

any help or information would be really appreciated. Thank you in advance.

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Create a Linux VM

January 12, 2019, 5:50 am
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Hi,

Is it possible to create or import a Linux VM into windows 2008 r2 Hyper-V server?

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Connect... does not work. Windows 10 Pro Hyper-V new install.

January 10, 2019, 8:16 am
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I'm just trying Hyper-V. I have a system that is perfectly capable of running VM's. I was able to create a VM and it was running. After I shutdown and disconnected I can no longer connect after starting the system. Clicking connect does nothing. It just starts a process that sits.

Anyone else with this issue?

David Jenkins

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Hyper-V Disk Issue

January 16, 2019, 12:25 am
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Today in morning we faced issues regarding cluster disk failures.

Below is the error we faced.

The validation report is run and found some warning can some expert help me to understand.

https://crescentpk-my.sharepoint.com/:u:/g/personal/osama_mansoor_crescent_com_pk/EUN8kP29fxBCs722GXxuLyYBlSX1LoufmDkIxOqBKN9c4Q?e=szzB9w

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How to customize the Hard Disk size while creating an Ubuntu VM using Quick Create

January 9, 2019, 6:46 pm
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Team,

I am trying to create an ubuntu VM using the quick create option and I would like to have the Hard Disk to be 80 Gig instead of the default. Also I would like to customize that at create time. How could I do that?

Thanks and Cheers,

Sreeram

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Drive performance with hyper-v cluster

January 9, 2019, 5:53 am
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I have a Dell VRTX which contains 4 server blades each running Server 2016 and internal shared storage which is made available via cluster shared volumes.

The server has a mix of drives as its been upgraded over time:-

4 x 600GB 10k SAS in RAID 10

5 x 600GB 10k SAS in RAID 5

9 x 900GB 10k SAS in RAID 5

4 x 1TB 7.2k SAS in RAID 5

I have run some disk performance tests using ATTO Disk Benchmark from within various VM's (Some Server 2012 R2 and some 2016). Some VM's are on different drive arrays (CSV's)

I am getting pretty consistent results from different VM's on the same arrays, so I'm comfortable the results are correct.

I still have some older Server 2012 R2 VM's which give averages of 900MB/s write and 1.7GB/s read on the RAID 10 array. These would have been Gen 1 original VM's.

I have one Server 2016 VM which was in-place upgraded from 2012 R2, still original IDE controller as first boot drive. This shows speeds of 1.1GB/s write and 2.46GB/s read.

I then created a brand new Server 2016 VM in the cluster, storing it's VHDX also on the RAID 10 array. This had SCSI as the boot drive type and gave averages of 3.2GB/s write and 3.33GB/s read.

I found these results interesting as it implied that server 2016 was faster on the same hardware, but also that the upgraded server was not as quick as a new one. Could this be as a result of fragmentation, deduplication, or the upgrade process?

So I then created some new small (only 20-30GB in size) VHDX files for both these VM's, creating one on each of the drive arrays to test with.

With the upgraded 2016 server I was now seeing speeds of 5.75GB/s write and the same for read. Similar speeds were encountered with the brand new Server 2016 VHDX's.

I also tried a new VM running Server 2019 and saw similar speeds (So some consistency here)

So it appears that my old Server 2012 R2 VM's and the upgraded 2016 VM are experiencing much slower disk throughput than either a new Server 2016 VM or a new VHDX assigned to them.

Any thoughts as to the reasons? Disk fragmentation over time, dedplication or something else?

My plan is to run the in place upgrade on the remaining Server 2012 R2 servers to make them 2016, however I would like to fix this performance problem as part of this, to ensure they are all running as fast as they can be.

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Networking issue / question

January 9, 2019, 4:56 am
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Have been fighting this for awhile and it was working for awhile, but something seems to have changed so back to the drawing board.

Running Hyper-V on my Laptop, to run labs and test environments, and run into a lot of network issues where I do not get good connection on the VM or lose network connection on my laptop when the VMs are turned on.

Goal I am setting up is multiple VMs using internal switches, and a router vm running PFSense that handles the routing.  For the router VM I figure the best option would be to use the Default Switch for the WAN adapter.

From reading I have heard of issues and needs to disable the "Intel Access Filter driver" check box on the virtual adapters that created on the laptop, but not sure if this has truly helped or not, it seemed to, but being I am again seeing network drops I figure I need to configure something differently.

The reason for the PFSense router, is I am setting up a full environment of VMs (AD, SCCM, client machines), and it handles DHCP for me for the VMs and handles the routing for network boot and all that.

Anybody seen this issue where network constantly drops or gets very slow when setting up VMs, and are there any tips for best way to setup the network connections to avoid this problem when using Hyper V on mostly Wifi.

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HyperV Virtual corrupted

January 6, 2019, 4:12 am
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Dears all,

I have a win server 2012 R2 hosting backup domain controller on a virtual machine, suddenly we came last week and we found the virtual machine unable to boot the win server, we have tried to do all possible suggestion from the internet without luck.

kindly note that we don't have any snapshots or backup for the virtual machine,

is there any tool to fix this issue? or in such cases what we must to do?

Thank you,

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Hyper-V

January 3, 2019, 6:32 am
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Hi all, I have the following scenario:
3 node cluster Hyper-V with Windows 2016 DTC edition with CSV configured, the three node access to storage by iSCSI. On the cluster I have installed a traditional SQL Cluster with shared disks and other standalone VMs. If a fail occure on the network interface the VMs continue to run normally but the two node of SQL cluster crash and the only solution to restore the situation is to remove the shared disks, add they again and restart the two node.

Do you have some idea?
Thank you very much
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Hyper-V | Mouse not captured in Remote Desktop session. | 16/01/19

January 16, 2019, 3:01 am
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Hyper-V
Mouse not captured in Remote Desktop session.

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Dear person reading this,

I have tried many solutions found on different forums.
All the solutions i tried didn't seem to work.

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The solutions i tried was:

  • CNTRL + ALT + LEFT ARROW
  • Installing the Guest opperation system
  • Installing Intergration Services (Option wasn't available in dropdown menu)
  • Deleting the "VM Guest Additions or something similair to that. (Wasn't there)

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scenario:

  • We have Hyper-V server 2016.
  • Connecting with the Hyper-V Server through "Remote Desktop Session". (Probebly the cause of this problem)
  • Other VM's work fine, this newly created VM is the only VM with this problem.
  • Mouse pointer is a "tiny black box".
  • when clicking gives the error message "Mouse not captured in Remote Desktop Session."
  • VM was created from a .vhdx from custommers HDD (shouldn't be the problem, worked before in other cases)
  • Am able to use the keyboard and nevigate through the OS.

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If anyone has a solution pleas contact me.

Kind regards,

B-Mol

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Hyper-V 2019 - Guest VM's shutdown unexpectedly

December 12, 2018, 12:26 am
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Hi,

Since upgrading my Hyper-V servers to Windows Server 2019, including KB4471332 from last night, my guest VM's do not power down on restart of the 2019 host.

I can confirm integration components are as up to date as possible, and each guest is configured to shutdown when the host restarts.

Each guest gets the "Why did I shutdown unexpectedly message".

The even viewer yields the following all within 30 seconds of restarting the host:

Shut down physical computer. Stopping/saving all virtual machines...

'ADFS' failed to perform the 'Shutting Down' operation. The virtual machine is currently performing the following operation: 'Shutting Down'. (Virtual machine ID 0CFDF648-EE9D-4141-9EBD-9A6D911C3442)
'ADFS' failed to shut down. (Virtual machine ID 0CFDF648-EE9D-4141-9EBD-9A6D911C3442)

The Update Orchestrator Service service terminated with the following error:
This operation returned because the timeout period expired.

Failed to restore configuration for port 59229EE2-C880-4BF2-9849-89A21EC17772 (Friendly Name: ) on switch 300C0E17-E123-4182-BE62-AAD1860BE841 (Friendly Name: ), status = Object Name not found..

Everything is configured as it was on the 2016 Hyper-V host.

The message ADFS failed to shut down because it is shutting down seems terribly odd to me.  Of course its shutting down, just need the host to wait. (Yes the registry is set to 120 as the default time for the host....)

Fairly simple to recreate....just spin up a 2019 server, install Hyper-V role, throw in a VM and test.

Any help would be appreciated, but my money is on it being another bug.

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