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Hyper-v over smb: strange smb sessions.

Hello.
We have a Hyper-V cluster (2016) that works with the SOFS cluster (2016).
Usually, for each vhdx file there are connections on behalf of the Hyper-V host that uses it.
However, sometimes there are sessions on behalf of Hyper-V administrators.

Get-SmbOpenFile | ? Path -match "Server2_1day.vhdx" | select FileId,  SessionId, ShareRelativePath, ClientComputerName,  ClientUserName | ft

       FileId     SessionId ShareRelativePath                       ClientComputerName ClientUserName
       ------     --------- -----------------                       ------------------ --------------
9191767457793 9191364231205 NOTIERVMDATASERVER2SERVER2_1DAY.VHDX 10.0.10.11         %Domain%%host%$
9194988110257 9191297122641 notierVMDataServer2Server2_1day.vhdx 10.0.10.11         %Domain%%administrator%
9191766885145 9191364231205 NOTIERVMDATASERVER2SERVER2_1DAY.VHDX 10.0.10.11         %Domain%%host%$

If such a session is interrupted, the virtual machine receives a critical error and stops.
We have found that these sessions appear, for example, when the size of vhdx changes on the fly.
If the virtual machine is turned off and on, they disappear.
If the virtual machine is restarted, they remain.

Is it possible to avoid the appearance of such sessions?
Is it possible to avoid the appearance of such sessions when changing the size of the disk without turning on / off?

Read full post . . . .

Hyper-v over smb: strange smb sessions.

Hello.
We have a Hyper-V cluster (2016) that works with the SOFS cluster (2016).
Usually, for each vhdx file there are connections on behalf of the Hyper-V host that uses it.
However, sometimes there are sessions on behalf of Hyper-V administrators.

Get-SmbOpenFile | ? Path -match "Server2_1day.vhdx" | select FileId,  SessionId, ShareRelativePath, ClientComputerName,  ClientUserName | ft

       FileId     SessionId ShareRelativePath                       ClientComputerName ClientUserName
       ------     --------- -----------------                       ------------------ --------------
9191767457793 9191364231205 NOTIERVMDATASERVER2SERVER2_1DAY.VHDX 10.0.10.11         %Domain%%host%$
9194988110257 9191297122641 notierVMDataServer2Server2_1day.vhdx 10.0.10.11         %Domain%%administrator%
9191766885145 9191364231205 NOTIERVMDATASERVER2SERVER2_1DAY.VHDX 10.0.10.11         %Domain%%host%$

If such a session is interrupted, the virtual machine receives a critical error and stops.
We have found that these sessions appear, for example, when the size of vhdx changes on the fly.
If the virtual machine is turned off and on, they disappear.
If the virtual machine is restarted, they remain.

Is it possible to avoid the appearance of such sessions?
Is it possible to avoid the appearance of such sessions when changing the size of the disk without turning on / off?

Read full post . . . .

Host network performance worse than on VMs

Hi 🙂

I have a Windows 10 HyperV with an internal interface as main Nic (default GW), in same subnet of my VMs.

When transferring Windows files or Veem backup through a Wifi/LanRouter that goes through a Pfsense router in the HyperV the speed is less than half for the HyperV Host (starting at 50MB/s and stabilizing at around 25 after a while), but
normal to a VM in the same subnet (around and above 100MB/s == Gigabit).

Because my main storage is on the hvHost I would like to have full speed.

I have changed cable and Nic already.

Removed all traffic shaping on the Pfsense vm.

Tried to Enable and Disable the VMQ on concerned VMs (it seems not applicable on a Win10 host Bridge).

I think I have isolated the issue is with the HyperV host machine. I am pretty sure it was working at full Gigabit speed before and something happened at some point

It is worth mentioning the same HyperV host has 3 connections in the same Wifi-router subnet, a Wifi one with no def.Gateway, 1 going to a VM, 1 to another VM (both unshared in the management OS).

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Hyper-V shared nothing live migration

Hi guys, 

just want to ask something, since i am spending already too much time on troubleshooting it myself.

so i have 2 storage space clusters., both runninn smoothly. (all vms running on CSV) I now just want to migrate some vm’s from 1 cluster to the other with shared nothing live migration.  I knew there are some requirements, wich i think i all fulfilled…

tried it manually in hyper-V, and with VMM, both giving same error.

Migration did not succeed. Failed to copy file ‘C:ClusterStorageVolume3AMDV-AX365-036FinandOps8.0withPlatUpdate15.vhd’ to ‘AMD-HC02AMD-HC10.2149894307${53a6648f-c7c3-4ee0-825c-37411031c1c1}AMDV-AX365-036-1FinandOps8.0withPlatUpdate15.vhd’: ‘The
specified network name is no longer available.'(‘0x80070040’).
Unknown error (0x8000)

- I configured in AD the kerberos delegation. all nodes have access to eachother (i have no credential error, so all good here)

- In Hyper-V settings, incoming and outgoing live migration enabled, use all available live migration networks enabled

- enabled live migration with different cpus…

-disabled firewalls for testing..

When i start the migration, all steps are green, only the copy ….  I even see in the volume that the folders are being created..

When i powershell on target machine, get-smbshare, i see the smbshare is created , but its gone after few seconds…

I think i am close, but somewhere something is screwing me

any help would be appreciated

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Questions for Virtual Machine’s Graphic card

Hi, there

I want to use Windows 7 Virtual machine on Windows 10 Hyper-V.

In this case, can Win7VM  use Win10’s Graphic Card?

If yes, do I need to configure some settings in VM or host machine?

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Hyper-V manager – cannot connect to new created VMs

I’m new to hyper-v and virtualization platform on windows.

I just follow the instructions and created a local virtual machine on my laptop.

I started it and the tried to connect, but no luck. I just get the error: "Cannot connect to the virtual machine. Try to connect again. If the problem persists contact your system administrator" 

I can see hyper-v enabled in windows features and the services are running.

The hyper-v manager shows my VM is running but still cannot connect.

Looking on another forum https://social.technet.microsoft.com/Forums/en-US/2f6c2d14-7e5f-4764-8569-850d9a4739ad/windows-10-hyperv-cannot-connect-to-the-virtual-machine?forum=win10itprovirt , i can see several people complaining about this issue but
no answer in 3 years :(. Just a reference to a doc which doesn’t exist.

I’m using win10  enterprise ver 1709 (OS Build 16299.551)

My laptop is part of a domain and the domain user i’m using is part of the Hyper-V administrators group.

Any help?

Regards

Ves

Read full post . . . .

Hyper-V manager – cannot connect to new created VMs

I’m new to hyper-v and virtualization platform on windows.

I just follow the instructions and created a local virtual machine on my laptop.

I started it and the tried to connect, but no luck. I just get the error: "Cannot connect to the virtual machine. Try to connect again. If the problem persists contact your system administrator" 

I can see hyper-v enabled in windows features and the services are running.

The hyper-v manager shows my VM is running but still cannot connect.

Looking on another forum https://social.technet.microsoft.com/Forums/en-US/2f6c2d14-7e5f-4764-8569-850d9a4739ad/windows-10-hyperv-cannot-connect-to-the-virtual-machine?forum=win10itprovirt , i can see several people complaining about this issue but
no answer in 3 years :(. Just a reference to a doc which doesn’t exist.

I’m using win10  enterprise ver 1709 (OS Build 16299.551)

My laptop is part of a domain and the domain user i’m using is part of the Hyper-V administrators group.

Any help?

Regards

Ves

Read full post . . . .

Critical Exceptions Thrown in Event Log After Clean Install/Reset 1803

I recently installed Windows 10 clean install latest updates, and am getting the following critical errors in my event log after installing the Hyper-V feature:

- System
- Provider
[ Name] Microsoft-Windows-Host-Network-Service
[ Guid] {0C885E0D-6EB6-476C-A048-2457EED3A5C1}
EventID 1030
Version 0
Level 2
Task 0
Opcode 0
Keywords 0x8000000000000000
- TimeCreated
[ SystemTime] 2018-08-12T08:03:24.902659100Z
EventRecordID 38
Correlation
- Execution
[ ProcessID] 6024
[ ThreadID] 6204
Channel Microsoft-Windows-Host-Network-Service-Admin
Computer
- Security
[ UserID] S-1-5-18
- EventData
HResult 0x80070032
API 1

- System
- Provider
[ Name] Microsoft-Windows-Dhcp-Client
[ Guid] {15A7A4F8-0072-4EAB-ABAD-F98A4D666AED}
EventID 1001
Version 0
Level 2
Task 3
Opcode 75
Keywords 0x4000000000000001
- TimeCreated
[ SystemTime] 2018-08-12T08:00:57.403888400Z
EventRecordID 17
Correlation
- Execution
[ ProcessID] 2028
[ ThreadID] 7952
Channel Microsoft-Windows-Dhcp-Client/Admin
Computer
- Security
[ UserID] S-1-5-19
- EventData
HWLength 6
HWAddress 72150AF90F05
StatusCode 121

The interesting thing is that Default Switch appears to be forced installed now that generates an IP address and subnet that is completely different from the host network.

I am not sure if that is by design but it would be nice to have a clean Event Log that doesn’t involve me turning off these IDs. 😛

Thank you for any assistance you can provide!

Michael

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unable to connect to any VM after 1803 update

I am completely unable to access any VM hosted on my WIN2016 server after the update to windows 10 1803. Before it was working normally. I get no error message at all, just when I click connect, or double click, nothing happens. Tried also on a second
client of the same domain, same result

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vhdx – converting generation 2 to generation 1

We need to convert a generation 2  vhdx to a generation 1  vhdx.

How do we do this?  detailed steps?

Once we have a gen 1 vhdx we need to convert it to a gen 1 vhd.


dsk

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