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Use Hyper-V dynamic memory leads to full allocation of RAM in the Hyper-V guest since a few days, severe performance issues included

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I have reported an issue to my Hyper-V hosting provider where I see a uncommon behaviour on my Hyper-V guest even when freshly deployed.

The Hyper-V Host system is Windows 2012 (assumingly Datacenter, clustered), the guest machine is a Generation 1 Windows 2012 R2, fully patched. Dynamic RAM is configured according to the Hyper-V Server provider.

The problem I see:

In my business environment (Windows 2012 R2 Host, Windows 2012 (R2) guests, with dynamic memory configured, aswell as in my testlab (Windows 10 CTP b10240 Host, Windows 2012 R2 guest generation 2) this problem does not occour.

After I have reported this to the Server provider, it now also occours in my Testlab. So it seems that a Windows Update is responsible for the problem.

Summary:

- RAM allocation in the taskmanager in the guest machine does not reflect the usage of the guest machine

- system performance incl. Windows UI is degraded in the guest OS, like it really would suffer full RAM, start swapping etc.

- this was not an issue before some days in my testlab, but now behaves the same. (all updates applied on the host, no updates applied on the guest)

- it does not matter if the guest OS is fully patched or not, it will show the same issue at the moment.


Evidence:
Normal behaviour of RAM consumption / allocation with Hyper-V dynamic RAM enabled on the Host (testlab, fresh installed machine, no updates on guest OS). The same situation exists in our productive environment Windows 2012 R2 Host, clustered but the hosts are not fully patched, yet.

http://imageshack.com/a/img909/5853/7ABr0Z.png (dynamic RAM enabled)
http://imageshack.com/a/img540/1921/9QDhAB.png (dynamic RAM disabled)

current behaviour of RAM consumption / allocation with Hyper-V dynamic RAM enabled on the Host (testlab, fresh installed machine, no updates on guest OS).

http://imageshack.com/a/img673/7048/K4Pgc2.png

current behaviour of RAM consumption / allocation with Hyper-V dynamic RAM enabled on the Host (Hosting provider, fresh installed machine, fully patched, incl. optional updates)

http://imageshack.com/a/img661/2030/xlBvZO.png

Because it is evident that the behaviour changed in the last few days, I hope this will raise awareness at Microsoft and hopefully help to identify the issue, moreover as this affects Hyper-V guests across plaforms.

What do you think?

cheers,

Karl


MCP Windows Server, MCSA Windows 2008 / 2012, MCITP Hyper-V SCCM







Hyper-V drops connections for virtual machene due high load.

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I am using Windows Server 2012 R2 Hyper-V server and have Linux proxy server working on the virtual machine. When it gets high load Hyper-V start to drop connections while network adapter is up. The problem is similar to https://support.microsoft.com/en-us/kb/2263829 but we have 2012 R2. Moving the virtual machine to the KVM hypervisor solves the problem but we want to use Hyper-V server. Same Hypervisor is running several other VMs running Linux OS machines with lower network activity and they perform well.

Unable to enable LLDP on windows 2012 R2

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Hi,

  Anyone successful in using LLDP on a microsoft Windows 2012 R2 Datacenter edition ? When I enable it via

Ethernet card -> Properties -> Client for Microsoft Networks --> Install -> Protocol --> LLDP , I hit the error

"Could not add the requested feature. The error is : the system cannot find the file specified. ".

My system32 does not seem to have the MSLLDP.sys.

Tried to use the install iso and still not able to find it. Any place I can download it from ?

Encounter Error When backup Hyper V VM using Windows Backup

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Dear Hyper V Expert,

I am encountering error while trying to backup the Hyper V VM by using WIndows Server Backup 2012. My Hyper V server is running Windows Server 2012 Standard and I am creating a schedule to backup the VM to a shared storage. The VM is running Windows Server 2008 R2 Standard. I can see that there is file being backup, but at the end it is failed with the error message below. Please advise whether there is compatibility issues occurred here.

Thanks.

Regards,

H

Using Windows 10 Hyper-V Manager to Manage Hyper-V Server 2012R2 Hosts

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Hello, I just upgraded my machine to Windows 10 and now my Hyper-V Manager cannot connect to and manage our Server 2012R2 Hyper-V Hosts. I get the following error.


"An error occurred while attempting to connect to server xxxxx. Check that the Virtual Machine Management service is running and that you are authorized to connect to the server."


I've read in multiple places that Hyper-V Manager in Windows 10 and Server 10 will support managing Server 2012 and 2012R2 hosts. I'm not sure why it's not working though.


Any help would be appreciated.

Diferencia entre Hyper v server y rol de hyper v

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Hola, mi consulta es la siguiente, cual es la diferencia entre instalar hyper v server  y el rol de hyper v, hay mucha diferencia cuanto a prestaciones, estabilidad etc?.

Saludos. 

Grouping VMs in Hyper-V

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I am using the Hyper-V app in Windows 2012 Datacenter. 

Is it possible to create groups inside Hyper-V in order to better manage my VMs? 

Most of my VMs are used to test various applications from vendors, and I am starting to have quite a few of them and navigation is now not so simple.

the processor doesn't support SLAT

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I set up Server 2016 TP3 without gui.

Tried to install Hyper-V feature and got a message:

install-windowsfeature : A prerequisite check for the Hyper-V feature failed.
1. Hyper-V cannot be installed: The processor does not support second level address translation (SLAT).
At line:1 char:1
+ install-windowsfeature hyper-v -restart

I installed 2016 on my test box on which I wiped out Server 2012 R2 running Hyper-v.

The machine is Quad Core.

I believe that Hyper-V of 2012 required SLAT... because could not install Hyper-on on laptop running Windows 8.1 (and the message was about no SLAT).


--- When you hit a wrong note its the next note that makes it good or bad. --- Miles Davis


virtual lab server not connected to internet??

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Im trying to run Getting to Know windows server 2012 r2 virtual lab but of the 3 servers, one isn't connected to corpnet at all, and it has a 169.254 ip.   I dont know how to fix it.  When I look at internet connections available, all it shows is limited access.  I can't use Hyper-V Manager to connect to the server in order to do the lab.  Any ideas?

Extend VHD when the vhd has Snapshots,how to fix it ?

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Extend VHD when the vhd has Snapshots

the avhd can't link the vhd

How to fix it ?


My Blog:http://sun8134.cnblogs.com

Hyper-V Replica saved me but I'm stuck going back

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I never thought having a Hyper V replica server would ever come in handy as a life saver, when I was running a 3 Node cluster, however last night I can tell you that it saved my butt!  

I won't get into the specifics of how I lost a 3 node cluster, but you can say the SANs died.  So here is my predicament and I have read a lot of articles and posts over the last 2 hours and so far I can't find a solution to my problem.

Normally when the primary server is back you can do a reverse replication.  I have done it before in my disaster planning and testing, however after loosing the cluster, I lost my VM configuration. This means I can fail it back over to the parent cluster, because all of the roles are gone since I had to rebuild a SANs.  

I need to get the replica server's VMs back to my new cluster.  IT says specifically in the Microsoft "Manual" for HyperV replica "The Replica virtual machines must be replicated back to their original primary server. Do not attempt to configure replication from the Replica server to a third server."  per  Link here

Well the problem is that after rebuilding the cluster's SAN this is essentially a "3rd" server.  

So I tried "Moving" a VM to the first node and it works fine, however it still thinks it is in a fail over state it also have the snapshot.  I tried moving individual resources, however due to permission issues with the cluster I can't copy anything to a CSV from another server.  

Any suggestions would be GREATLY appreciated!

Jason

cannot install 2016 tp3 in server 2012 HV host

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host 2012 R2

cannot install 2016 TP3 from ISO.

The same ISO used for USB key from which installed 2016 on couple of laptops. Extracted couple of times.

On VM start can see Install screen and then "your computer run into the problem... page fault in non paged area"

I installed for test W7 and W10 from ISO. Run memory diagnostics on my TEST box. NO problem.W1

1. Can somebody confirm successful install from 2016TP3 ISO on 2012 host?

2. What to do?

Thx.


--- When you hit a wrong note its the next note that makes it good or bad. --- Miles Davis

Windows 10 Build 10240 Managing Hyper-V on 2012 R2 Datacenter Cannot Connect

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So, we have a total of six Hyper-V servers in our environment. All six were installed from the same Server 2012 R2 Datacenter ISO. I have been managing these from my Windows 8.1 machine with no issues. I got ahold of Windows 10 build 10240, and I am running into an issue connecting to the servers now.

The strange thing is that I CAN connect to one of them. I cannot figure out what is different on this one server from the other five. Windows updates maybe? I migrated all the VMs off one of the servers I cannot manage remotely, performed all Windows Updates, and I still cannot connect to it.

I am reading that Windows 10 should be backward-compatible with managing Hyper-V on 2012, but on connection, it appears a WMI namespace is missing that the Windows 10 tools are trying to connect to.

I am not trying to use alternate credentials (I read this will NOT work from 10 to 2012 R2). Any ideas why this is not working? Several Google searches have not told me anything so far. I realize Windows 10 has not officially been released yet, but a few of us are testing the waters for compatibility issues.

I would appreciate any help anybody can offer.

Eric

how do you manage the VM locations?

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Windows Server 2012 R2

the vendor who installed our hyper-v serves uses C:\ClusterStorage for the disks and VM location. when i had a look inside, i found confusing ways of storing the files, for example, there would be

"C:\ClusterStorage\MachineA\MachineA\Virtual Machines\" <-- where the VM is located

"C:\ClusterStorage\MachineA\MachineA\ <-- where the disk is located

OR

"C:\ClusterStorage\MachineB\MachineB\Virtual Disks\" <-- where the disks are located

"C:\ClusterStorage\MachineB\MachineB\Virtual Machines\" <-- where the VM is located

why is there duplicate of machine names and why sometimes there is a folder for virtual disks?

my assumption is the ISO files to use for installing windows should be somewhere accessible by hyper-v manager and then the actual C: drive created will be in those "Virtual Disks" folders. but in our case the disks are everywhere it seems.

difference between hyper V and VMware

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difference between hyper V and VMware I am looking simple differences I know about the product. second question installing Hyper V means need to install Operating system like standard, enterprise, datacenter and install Hyper V ? incase if operating crashes how hyper V will works

Errors in Hyper-V Machine Manager

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I have a newly installed 2012R2 server. I am running four (4) virtual machines under Hyper-V. Every time I go to do something with setting on one of the machines, or create a new machines I get errors saying that I was unable to complete the job - no reason give, just fails.

I have found that if I go into services and restart the Hyper-V Virtual Machine Management service, everything works for a period. I have noticed that the VSSWriter for Hyper-V goes off line with a failed (8) on the vssadmin list output. At this point my backups also start to fail and I get 'Catastrophic failure (0x8000FFFF)' errors in the event log for all four (4) VMs.

I have checked the versions of integration services using the powershell script from the virtual_pc_guy archives (sorry, the system would not let me embed the link here) and all show as up to date.

I have also checked and all VMs have at least 90GB of free disk space.

This is frustrating me no end and is delaying the upgrades to our other two (2) servers currently running Hyper-V under 2008R2.

Any suggestions greatly appreciated.


Hyper-V guests on AMD-based Dell servers - perceived peformance is poor but benchmarks are fine

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We have a Hyper-V cluster with Windows Server 2012 (it had been Server 2008 R2 before with the same issue). The hosts have 4 12-core Opteron CPUs and 320 GB RAM.

Now, the perceived performance on the virtual machines is quite poor. This is, certain actions in certain applications take way longer than on a physical machine (while other actions in other applications are working fine).

I ran several benchmarks in multiple virtual and physical machines, but could not find a notable difference. CPU, disk, cache performance are perfect. RAM performance is rather poor compared to Intel systems (ca. 1900 MB/s while my i5 desktop shows 7500 MB/s), but I found that it's similarly poor on physical AMD-based servers (around 2100 MB/s, so it seems to be related to the CPUs or chipsets). (These physical AMD-based servers perform well, so the issue does not seem to be related to that RAM performance.)

Does anyone have an idea what could cause this? Are there any other things I could test or performance counters I could watch?


Hyper-V Server 2012 with HP Smart Array B110i RAID Controller

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I'm setting up a new server for a client and attempting to install Hyper-V Server 2012.

When I turn on 'Embedded SATA RAID' within the BIOS settings on the ML330 G6, the Hyper-V installation cannot find any available disks for the installation to proceed. I searched for drivers for the 250GB SATA drives that are installed to no avail. I installed Windows and it can see the RAID1 array perfectly fine.

Upon turning off the 'Embedded SATA RAID' function in the BIOS, the Hyper-V installation can see both drives. Hurrah. But now I can't use HW RAID :(

I've turned 'Embedded SATA RAID' back on and tried the Hyper-V installation once more, again no drives available.

What's the go? Hyper-V doesn't support HP's Smart Array controllers, or this controller specifically? But Windows does??


Regards,

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Some Windows Guests not demanding more memory

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Scenario

I have a 3 Windows 2012 R2 Hyper-V hosts which is participating in a cluster, all of the virtual machines are hosted on CSV's. We also use Dynamic Memory for most of the servers

We do regular reboots every week for our virtual machines, but we've found that sometimes, a virtual guest will suddenly stop requesting additional memory.  At the time of writing, I have identified 10 machines - on different hosts, and even different clusters which are exhibiting this behaviour.  They're also running OS's ranging from Windows 7 to Windows 2008 R2 and Windows 2012.

I have selected one to demonstrate below.

Here, you can see the virtual machine is configured to use Dynamic Memory

Dynamic Memory Configured

and here, you can see that it's not actually demanding more than the start memory, despite the fact that I've overloaded the servers virtual memory by using MSPAINT.

Workaround

Rebooting the virtual machine does not resolve the issue, but live migrating the virtual machine from the host it is on to another host suddenly allows it to demand more memory.  One can then live-migrate it back to the original host and the problem is no longer there.

Troubleshooting

We have performed the following troubleshooting steps:

  • Verified that the Integration Services are up-to-date (currently running 6.3.9600.16384)
  • Verified that the virtual server has up-to-date Windows Updates
  • Checked the Hyper-V-Worker\Admin event log on the current host - no errors pertaining to this VM.
  • Verified that the Hyper-V host has sufficient RAM (currently only using 542 out of 768 GB)
  • Checked the System event log on the virtual machine - nothing out of the ordinary to report.
  • Verified that all services which start with the word "Hyper-V" on the guest machine is running.

Using the following command, I can easily identify which machines are affected (this command applies to SCVMM only):

Get-SCVirtualMachine | where {$_.DynamicMemoryEnabled -eq $true -and $_.DynamicMemoryDemandMB -eq $_.Memory} | ft Name,HostName,OperatingSystem,Memory,DynamicMemoryDemandMB,DynamicMemoryMinimumMB,DynamicMemoryMaximumMB


I do not know any diagnostic program which can give me more information regarding the memory status of a server - specifically one which can tell me more information about Memory demand, and why it's not working. 

Considering that the problem is resolved when I live migrate the affected machine, it would suggest that the issue is with the host, but as live migrating it back no longer exhibits the issue - that seems to negate that theory.  Additionally, the other 103 virtual machines which run on this host seem to not show this issue.

It's almost as if the machine is being ran with static memory, and Hyper-V doesn't realise it's dynamic, but the moment it's live migrated, it suddenly realises this and enables dynamic memory.

Any thoughts?



Slow disk response times child server in a cluster using ISCSI and MPIO

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HI,

We have a 3 node windows 2012r2 cluster using HPStore Virutal ISCSI SAN with HP MPIO, with 3 separate CSV's.  Occasionally the child servers suffer high disk latency, response times in the 1000ms, however when we look at the parent servers they have good response times from the VHD's running via ISCSI. 

The servers have 2 1gb nics connected to the ISCSI network these never go above 15% utilisation even when high latency is being experienced.

Any pointers would be appreciated.

Regards Richard


Richard

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