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Hyper-V Host Server RAM Utilization

January 15, 2014, 2:18 pm
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Hi,

We are running Hyper-V Environment on a Dell Power Edge R720 Server which has 128GB RAM.

Installed Windows Hyper-V Server 2012 R2 on the Host and created 7 VM's.

Total RAM assigned for 7 VM's is 116GB and remaining available is 12GB. But when i am trying to create a new VM on this host,it says you don't have sufficient RAM to create a VM. what could be the reason ?

How much memory does the Host server occupy and what factors does this take into consideration ?

11GB for a Server Core installation of OS ? i am stuck here ?

Thanks .

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Slow Guest VM connection to DELL iSCSI Powervault in a Windows Server 2012 R2 Hyper-V Cluster

January 15, 2014, 2:26 pm
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Hi, we are currently experiencing serious performance issues on the LUNs of a couple of VMs that are connected to a Dell iSCSI SAN. Here is my scenario:

  • 4 Windows Server 2012 R2 Hyper-V Hosts in a HPV Cluster connected to a Dell Powervault MD3200i using the iSCSI initiator and with the Dell MD Storage software installed.
  • Inside are around 40 VMs running without any performance issues.
  • Each HPV Host has 4 NICs connected to the SAN, 2 of them are also used on the Hyper-V network.
  • 2 VMs are clustered and connected to the Dell Powervault using the iSCSI initiator.
  • Each VM also has the Dell MD Storage software installed.

The problem is that the LUNs that are configured on these VMs work super slow. They took forever to format, they take forever to copy files, they take forever to do anything.

I already configured on the VM NIC connected to the SAN, the Jumbo Frames to 9000 according to the SAN provider that told us to configure them that way. They say the SAN is correclty configured and that the problem is related to the virtualization environment.

I even tested configuring a VM outside the Hyper-V cluster on a standalone Hyper-V Host, and that VM works perfectly fine connected to the Dell Powervault! No performance issues at all! 

Any help on this matter is deeply appreciated.

Regards!


Eduardo Rojas

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Child Partion Backup Not available

January 15, 2014, 4:09 am
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Hello all, I've got the following setup:

- Windows 2012 running DPM Server 2012 SP1

- Several Windows 2012 Servers running Hyper-V (2012 + 2008SP1 VM Servers)

For a majority of my VM's on the Hyper-V hosts I'm able to back up using Child Partition Snapshot - but I have a single VM server which refuses to be backed up using the Child Partition Snapshot (even though this server is identical - build from a VMM image as the other servers) and only allows Saved State.

The problematic VM server is Windows 2008R2 - the Hyper-V intergration agents are installed and all services running, the disk is not dynamic, the host is running, VHD is a fixed size and it NTFS.

I've tried rebooting the VM, moving to different protection groups without any change to the Saved State backup - does anyone have any ideas?

Regards

Simon

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Hyper-V VM on All-In-One server

January 15, 2014, 7:53 pm
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I am working for a small law firm that only has 1 hefty 2008 R2 server. That's all they really need. It does AD/DNS/DHCP/File Print/Hyper-V. The server has 2 NICs. I would like to completely separate the VMs from the Host server as far as network access goes. I have tried to configuring this in many different ways but all come back to the VMs not able to access the host server and not being able to resolve DNS requests, or none of them having any network access including the host server.

Is this possible to configure? How do I configure the virtual network manager to achieve this?

Thanks!

TOny

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Hyper-V Virtual machine disappeared

January 16, 2014, 2:12 am
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Hello,

I am running Windows Server 2008 R2 SP1.  I have the Hyper-V role installed with to virtual machines.  I rebooted yesterday after windows updates loaded and now one of my virtual machine have disappeared.  I have run through hours of technet forums trying to find the answer and have come up empty. 

I checked ProgramData\Microsoft\Windows|Hyper-V\Virtual Machines and the symbolic link is gone.  I tried to recreat it using the mklink command, but every time I recreate the symbolic link to the .xml it comes back as a link to a file folder.

I checked the acl on the virtual machine .xml on my D: drive and the GUID SID is missing.  I also tried to add it back via the iacls command but it doesn't seem to exist. 

After all that, I decided to recreate the entire virtual machine, but now I can't create virtual machines.  I get teh following error:

"Failed to create external configuration store at 'folder path': A required privilege is not held by the client. (Virtual machine ID 0x80070522)"

After that error I opend azman.msc and verified that the initalstore.xml has the administrators group in it.

I do not know what else I can do from here.  Any help would be appreciated.

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Hyper-V network adapters - 1 per VM?

January 16, 2014, 5:12 am
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Hi,

I have 2 VM's running on 1 host.  Do I need 2 virtual NIC adapters and two hardware ethernet cables?  Will using 1 VNIC and 1 hardware NIC for two VM's impact performance?  They're being used for Citrix?

Also what is the impact by having 2 servers using 1 physical network adapter and two vnics?

Thanks, Matt.


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Licensing options for Server 2012 Standard Edition

January 16, 2014, 5:58 am
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I am working a proposal to a new client. Currently they have a single physical server, and 15 workstations, connected to AD;

Server 2012 standard running hyper-V - evaluation (and not attached to the domain)

On it are two virtual machines -

Domain Controller 2008 32bit - license is activated.

2nd server 2008 R2 64bit - evaluation  (attached to the domain)

If they purchase a 2012 Server Standard license, with 15 user cals, I should be able to activate the two unlicensed servers?

Mark Smed, NPA Network Support Technician msmed@northerncomputer.ca Northern Computer l Your trusted partner. Ph: 250.762.7753 Ext. 1803 www.northerncomputer.ca

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Migration Setup

January 16, 2014, 7:36 am
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Hi,

I have an existing Win 2012 Server running hyper-v using a HP iscsi SAN.  I am adding a second 2012R2 server to my setup.   My plan is to migrate the Guest machines to the 2012R2 server, upgrade the 2012 server and then create a cluster.  Can I just connect the iscsi volumes to the new 2012R2 server at the same time as the 2012 server and live migrate them over?  Are there any issues with connecting multiple clients not in a cluster to the same iscsi volumes or anything like that?

Thanks

Jason

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WMI High CPU Usage on Hyper-V VMs - Related to Data Exchange Integration Service

January 16, 2014, 8:33 am
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Title pretty much says it all.  Some of my VMs have high CPU and moderate usage going to the WMI Integration Service.  I have tracked it down to the Data Exchange Integration Service.  If I de-select the service under the VM configuration, everything works normally.  Has anyone seen anything like this yet?

Thanks, TJ

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Hyper-v performance issue?

January 16, 2014, 10:13 am
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Hi everyone. Quick question on some perf issues i've had for quite some time. To be fair i was using esxi 5.x and had similar issues. My vm server is running a first gen intel core series cpu (i7-920) that is overclocked to 3.8ghz. Just so you don't have to look it up it has 4 cores (8 with hyper-threading) I have 3 vm running on this server. 2 of the VMs pretty much do next to nothing they are just there for when i need to do some testing (one has server 2012 R2 and the other has ubuntu). The main vm that i'm having issues with has Win 8.1 enterprise. I don't have a lot of things installed on it but i do have plex (when i want stream videos through my house). At least for 1 stream (never tried more) it works just fine. When i remote into the machine and run some things its so dang slow. For example a fresh install of google chrome will constantly use 50-60% of the cpu. Somtimes it will peg it. Its go so bad i know use firefox most of the time though a lot better the cpu usage for firefox is still not where it should be. Now i know chrome is turning into a hog but it shouldn't be that bad. I've had this problem for quite some time (with windows 8 too). I think i have two vCPU assigned to this VM, 2 to Server 2012, & 1 to Ubuntu but like i said they hardly do anything. I have 4GB assigned to Win 8.1, 8GB to Server 2012, & 4 to Ubuntu (the machine has 24GB Total). Any ideas? Is the I7-920 getting so old that i should have these issue?  

Edit: I'm running Hyper-V on Server 2012 R2
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Can't type credentials via Hyper-V Manager

January 16, 2014, 12:23 pm
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So I'm RDP'd into a VM that I run RSat tools on and having a slight issue.

I created a new VM through this VM in Hyper-V manager. Then I start the VM and am doing a PXE boot.
Everything is working fine until I get to the credentials screen before I can install the OS and I cannot type anything. The keyboard worked prior to this screen and the mouse still works.

I even tried LMIR into the RSat VM and still am not able to type into the newly created VM. Any ideas what is going on? It's preventing me from continuing until I get physically to the location to enter the credentials.

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IOPs size for hyper-V VMs

January 16, 2014, 2:22 pm
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Hi,

I have few hyperv 2008 r2 hosts hosting about 20 VM's or so each. I have a SAN providing VHDs to VMs. 

The VHDs are differencing and not fixed size. I am in the process of finding out the I/O size hitting my SAN.

My question is :

If I get the Avg Disk Bytes/Transfer for the drive in host machine, would it be the proper IO size hitting the SAN?

Thanks for help in advance.

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iSCSI connections for guests: how to set up?

January 16, 2014, 2:35 pm
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A couple of questions:

1. If we wanted to set up iSCSI connections for guests such as SQL servers, what is the best way to handle this? For example, if we had four 10-Gb NICs and wanted to use as few of them as possible, is it common to turn two of the NICs into Virtual Switches accessible by the OS, then use these to connect both the host and the SQL guests? Or would the best option be to use two 10-Gb NICs for the Hyper-V Host's iSCSI connections only, and use the other two 10-Gb NICs as virtual switches which are dedicated to the SQL server iSCSI connections?

2. I know MPIO should be used for storage connections instead of teaming; if two NICs are teamed as a virtual switch, however, does this change anything? For example, if a virtual switch is created from a NIC team of two 10-Gb NICs, is it acceptable to create an iSCSI connection on a network adapter created on that virtual switch?


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WMI create extendedAcl for VM

January 16, 2014, 6:32 am
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What method  must be used for create new instance in Msvm_EthernetSwitchPortExtendedAclSettingData?

(Namespace: Root\virtualization\v2)

Windows Server 2012 R2

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Linux Integration Services Version 3.5 for Hyper-V

January 16, 2014, 6:33 pm
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We tested the 08R2 under, VM which is CentOS 6.3, after installing the Integration Services 3.5, the release of dynamic memory support discovery (Ballooning) 
I ran a VM eat small C program memory, Hyper-V can be seen in the "memory needs to go up," the program will close down. 



But seemingly not support Hot Add to rise (over Hyper-V in the initial set of memory) Is there any way to do this? 



Also in the Linux Kernel VM also need to recompile it? There seems to be online in order to support Hot Add to mention Linux Kernel need to hit up a Hyper-v patch, do not know whether it is true?

在IT的路上，You'll never walk alone

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DPM online backup Snapshot causing 2008R2 Guest VM;s to loose network for 30 to 60 seconds.

January 17, 2014, 12:52 am
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I have a 2012R2 Hyper-V cluster using SMB SOFS shares.

All Guests have the latest IC installed,

All the 2012R2/2012 guests backup fine and so do the 2008R2 guests, but when the online\ServerXYZ backup starts the network card disconnects for 20 to 60 seconds, and then reconnects, and the backup completes fine. as far as I can tell this is only happening on 2008R2 guests, and doesn't effect the 2012/R2 guests. although I see event ID 12 on all the 2012 and 2012R2 there is no network connection interruption

I have had to stop the jobs on these servers as it affecting various production applications that connect to SQL.

I am seeing event ID's 13 and 12 on the guest servers

need to find out what is causing this, I cannot find any other information.

thanks

Mark

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Processors - how many per VM?

January 17, 2014, 1:05 am
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Hi,

I have an HP G7 with 2 CPU's. Each CPU has 4 cores (8 in total).  What is best practice for allocating CPU to 2 VM's running on one server?  Currently I have 4 virtual processors allocated to each VM.  I'm looking to get the best performance out of both.

Any advice?  Thanks, Matt.

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Various ways of passthrough disks in Hyper-v

January 17, 2014, 3:31 am
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If I understand this correctly, I can have pass-through disk to a VM in the following ways...

1. Add a disk to Hyper-V server, take it offline and assign it as a physical disk to VM

2. Configure iSCSI initiator in guest VM to get a disk directly from storage array

3. Use VFC to export a fiber channel lun to guest VM directly.

Are all these three types pass-through mechanisms?  Out of these three which one does Microsoft support? Is there any way that I'll be able to differentiate one from another by looking at the disk in guest VM?

Thanks/Hem

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Reading hyper-v pass-through disks using WMI?

January 17, 2014, 3:34 am
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How do I read pass-through disks for a guest VM from a Hyper-V using WMI? I'd like to read the pass-through disks that are available to a guest VM using the below mentioned ways:

1. Add a disk to Hyper-V server, take it offline and assign it as a physical disk to VM

2. Configure iSCSI initiator in guest VM to get a disk directly from storage array

3. Use VFC to export a fiber channel lun to guest VM directly.

Thanks/Hem

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Hyper-v replication problem

January 17, 2014, 4:17 am
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hello,

i have two hyper-v servers and there is no active directory on network i want to enable mirroing on both servers.

when i tried to configure it and using kerberos i get this error:

[Window Title]
Enable Replication

[Main Instruction]
Enabling replication failed.

[Content]
Hyper-V failed to enable replication.

Hyper-V failed to authenticate using Kerberos authentication.

[Expanded Information]
Hyper-V failed to enable replication for virtual machine 'HR-SRV1': No credentials are available in the security package (0x8009030E). (Virtual Machine ID D1E6FB1B-B80B-4180-92F0-A6930CC6D752)

Hyper-V failed to authenticate the Replica server v1-srv. using Kerberos authentication. Error: No credentials are available in the security package (0x8009030E)

[^] Hide details  [Close]

so whats the problem?

thanks.

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