Forums

Hyper-V max vCPUs

Mon, 23 Jan 2012 16:17:38 GMT

Hey guys, is 4 really the max vCPUs we can setup on Hpyer-V 2008 R2 SP1? How do you address this in VMware environments when you're trying to do comparison testing?

Any help would be really appreciated.

Forums: Re: Hyper-V max vCPUs

Tue, 24 Jan 2012 00:53:46 GMT

Thanks Stansislav!

Forums: Re: Hyper-V max vCPUs

Mon, 23 Jan 2012 19:31:50 GMT

Hi,

4 vCPU is per VM. This is more than enough as most of the applications cannot take full advantage of more than 2 CPUs. And of course most of the time your VM CPU usage will be low.

You can read about more here:

http://technet.microsoft.com/en-us/library/ee405267%28WS.10%29.aspx

Forums: Re: Powershell script to calculate VM Size (Memory+VHD+Snapshots+Configuration files) in Hyper-V?

Fri, 20 Jan 2012 08:33:11 GMT

Any ideas guys? :(

Powershell script to calculate VM Size (Memory+VHD+Snapshots+Configuration files) in Hyper-V?

Mon, 09 Jan 2012 16:28:32 GMT

Hi guys,
Does anybody knows a powershell script that can calculate the size of VM. I need the script to calculate full VM size (Memory+VHD+Snapshots+Configuration files).
I want to know how much space takes a VM on LUN?
Thanks

RE: Powershell script to calculate VM Size (Memory+VHD+Snapshots+Configuration files) in Hyper-V?

Mon, 09 Jan 2012 16:44:52 GMT

To get the size of all files (vhd, avhd, config files, etc), you could simply check the size of the folder where these files are stored via PowerShell. Naturally, servers with a snapshot in place are going to have a growing differencing file.

Windows PowerShell Tip of the Week - Retrieving folder size.
http://technet.microsoft.com/en-us/library/ff730945.aspx

RE: Powershell script to calculate VM Size (Memory+VHD+Snapshots+Configuration files) in Hyper-V?

Mon, 09 Jan 2012 19:05:21 GMT

Hi Pete,
That was one of my guessing how the task could be achieved. But I have 4 clusters - 2 with 5 nodes and 2 with 2 nodes and I am not so good with scripting.
If the folder where the VM resiedes is with different name I will not know which machine is stored there.
It seems it is not an easy script to write especially if I have to check all the folders.
Thanks for the answer though.
I hope someone to have such a script already and to share it :)

Forums: Re: Official Guidance on Dynamic or Static VHDs

Mon, 14 Nov 2011 20:02:07 GMT

Not from me; I've never had the pleasure dealing with DPM ;-)

Forums: Official Guidance on Dynamic or Static VHDs

Wed, 10 Mar 2010 20:26:10 GMT

Does anyone have an official guidance on whether we should use static or dynamically expanding VHDs in Hyper-V R2? I have always heard dynamic results in a performance hit, but wanted to get a second opinion.

Re: Official Guidance on Dynamic or Static VHDs

Mon, 14 Nov 2011 19:32:32 GMT

Do you have any suggestions for doing Fixed Disk DPM backups across wan links? Is it better to install the agent on the host server and get the system state or would you get the child node from the hyperv server?

Logical network for iSCSI with Hyper-V cluster in VMM 2012

Mon, 17 Oct 2011 02:04:50 GMT

I was following this tutorial from Hyper-V.nu and unsure of something. I can create logical networks ahead of time or let the wizard do some of this for me, but do I need to create a logical network in VMM 2012 for the iSCI network used by the physical Hyper-V host?

Here's the post I am using as a guide.
http://www.hyper-v.nu/archives/hvredevoort/2011/04/scvmm-2012-creating-a-hyper-v-cluster/

Re: Logical network for iSCSI with Hyper-V cluster in VMM 2012

Tue, 25 Oct 2011 12:08:19 GMT

Any thoughts on this? I don't see why I would need to define a logical network in VMM for networks only used on my physical Hyper-V hosts.

Forums: Re: Can I use passthrough disks when setting up a two-node VM cluster?

Tue, 25 Oct 2011 12:06:05 GMT

Thanks for the input everyone, this was very helpful. Learning a lot here in the community.

Can I use passthrough disks when setting up a two-node VM cluster?

Wed, 05 Oct 2011 20:50:14 GMT

I want to cluster two virtual machines running SQL and present a passthrough disk, but everything I read says iSCSI would be required. Is it possible to setup a cluster between two VMs and have the clustered storage on a passthrough disk?

Forums: Re: Can I use passthrough disks when setting up a two-node VM cluster?

Mon, 24 Oct 2011 19:04:32 GMT

But in the end, the answer to the original question is no... You can't use fibre channel to create a "cluster within a cluster" with fibrechannel storage.

You can do it with iSCSI, because then the VM sees an iSCSI-controller and can send the necessary commands in case of a fail-over, but with FC only the Hyper-V-parent sees the FC-controller, the VM sees a "regular" disk.

I've heard this will become possible in Server 8's hyper-V, but than you've got to wait to next year (at least).

Forums: Re: Can I use passthrough disks when setting up a two-node VM cluster?

Fri, 14 Oct 2011 14:38:05 GMT

We have various VMs running on a 2node Hyper-V Failover cluster that are using passthrough disks.

Our infrastructure is BL460 G7s running FCoE connected to 3PAR storage. (we don't use iSCSI)

Out cluster has 4 x 250gb (a size we found ideal) CSV's and various passthrough disks.

As long as you configured the passthrough disks correctly on the VM, you should have no problems at all.

RE: Can I use passthrough disks when setting up a two-node VM cluster?

Fri, 14 Oct 2011 10:29:45 GMT

I was talking to my community colleague Han Vredevoort about this just the other day and he shared some good information, shown here:

Passthrough is not my favorite disk type because of its unfriendly configuration.
It is supported in a cluster but not in combination with Cluster Shared Volumes in Hyper-V
"Pass-through is dedicating a LUN to a VM. CSV is sharing a NTFS volume to multiple machines which can hold VHD files. With that said, having a CSV as a pass-through doesn't make sense... as one is dedicated, and one is shared.
You can mix disks in a VM... so you could have a VHD which is maybe the OS drive (which may or may not reside on a CSV volume, it's independent) and you could have another pass-through disk which is maybe the data drive."

Here is an explanation how to use Passthrough disks in a cluster with one VM on it.http://blogs.technet.com/b/askcore/archive/2009/02/20/adding-a-pass-through-disk-to-a-highly-available-virtual-machine.aspx

I highly recommend using either hardware iSCSI solution or a software iSCSI solution like Microsoft Software iSCSI target or HP P4000 Virtual Software Array (VSA).
You need a separate system (or VM) to provide the iSCSI target. You can then present the LUNs to the VM guest cluster nodes.

This is a good guide: http://www.aidanfinn.com/downloads/Hyper-VMSFTiSCSI.pdf

Forums: Re: Getting the mouse to work in RHEL / CentOS VM on Hyper-V

Tue, 04 Oct 2011 22:56:15 GMT

That was perfect Marco, thanks!

Getting the mouse to work in RHEL / CentOS VM on Hyper-V

Tue, 04 Oct 2011 15:14:12 GMT

Hey Guys, I have loaded the 2.1 version of the integration tools on CentOS 5.7, but my mouse just will not work! Has anyone gotten the mouse to work for either RHEL or CentOS?

Do I need a special driver?

Forums: Re: Getting the mouse to work in RHEL / CentOS VM on Hyper-V

Tue, 04 Oct 2011 16:03:26 GMT

Yes, you need a special driver:

http://www.xen.org/products/satori.html

You will need to compile the driver yourself.

Virtualize Hyper-V instance in a VM?

Wed, 13 Jul 2011 20:55:19 GMT

On the VMware platform, we can create a VMware cluster entirely in virtual machines for testing purposes (it's great practice). Is the same possible with Hyper-V?