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Massive Fibre Channel Performance dropoff after installing Hyper-V Role

June 4, 2014, 6:42 am
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Hi all,

using direct attached fibre-channel disk we see throughput of approx. 500-800MB/s if we copy/paste a 28GB file to the same disk.
Once we install the Hyper-V Role, and re-test, we see a throughput of 126MB/s maximum performing the same task.

In addition throughput speeds become extremely varied ( from 126MB/s down to 1MB/s! ) for the same transfers.

Hardware and Software details given below.

Have you seen this behaviour? Can you recommend a resolution?

Best Regards, Sascha

Server: HP DL380 Gen8, 128GB RAM, XEON E5-2630 @ 2.3ghz (2 CPU)
OS: Server 2012R2 (patchlevel 03/06/2014 via Windows Update Service)
FC: 2 x Emulex LighPulse HBA 8GB (Driver: 2.74.214.4) with MPIO
NIC: HP NC523SFP 10Gb 2port (Driver: 5.2.2.412 Teamed LACP)

SAN: Infortrend 24F-R2840-4 and NexSan E48


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Hyper-V 2008R2 Cluster only backup a Windows 2012 VM with saved state

June 4, 2014, 6:57 am
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Hello,

We have a 3 node Hyper-V 2008R2 Cluster with 20 VM's. We have also now some Windows Server 2012(r2) VM's on the cluster. The problem is that the backup of these VM's are only done trough saved state and not online. I already did some searching and I know it's a Hyper-V VSS problem that should be solved with setting a registry key inside the W2012 VM(http://mvanvliet.wordpress.com/2013/04/10/issue-windows-server-2012-virtual-machines-can-only-be-backed-up-using-saved-state/). But this doesn't work for me. I also checked this settings:

  • Backup (Volume Snapshot) Integration Service is disabled or not installed.
  • The virtual machine has one or more dynamic disks.
  • The virtual machine has one or more non-NTFS based volumes.
  • The virtual machine Cluster Resource Group in a cluster setup is offline.
  • The virtual machine is not in a running state.
  • A ShadowStorage assignment of a volume inside the virtual machine is explicitly set to a different volume other than itself.
  • An App-V drive is installed on the virtual machine that creates a non-NTFS volume.

None of these are true. Does anyone have onther option to solve this? Thanks!

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Guest OS Windows 7 for remote access

June 4, 2014, 9:08 am
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We are setting up 4 VM's with Windows 7 OS for staff access on a Dell PowerEdge R320.

We had all of the VM's working as specified above but had to re-install Server 2012 Standard because the factory tech setup the Raid 5 to only give the server OS 40 GB of space.

Installed Windows Server 2012 Standard with the following Roles and Features:

  • File and Storage Services
  • Hyper-V
  • Network Policy and Access Services - Network Policy Server - Health Registration Authority
  • Web Server (IIS) - Web Server (Defaults)
  • Management Tools (Default)

We will be joining this server to a Domain Controller on another server.

This server will need to have mapped drives to a third party software database and storage file installed in it for business management.

For setup purposes the NIC1 has been disabled to reserve it for iDRAC.

The NIC2 is set to a static IP address for RDP and DOES have internet access.

An External virtual switch has been installed in Hyper-V on the NIC2 named "Virtual Switch NIC 2" All of the guset VM's have the Virtual Switch "Virtual Switch NIC 2" installed (without VLAN ID and Bandwidth Management checked).

The guest OS does show the network adpater as a device and is also set to a static IP for RDP. The networking and sharing window shows "No Internet Access" and cannot repair or resolve the issue. The Guest OS also does not see the Host files shared or the Host in Network. It displays as an unidentified network.

Please advise and thank you in advance for your assistance.

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Backup and Restore VM

June 4, 2014, 10:00 am
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I have a host server that has a C: drive and a D: drive. Right now I only have one VM running and it is located on the D: drive. I need to reformat the disk that the D: drive is on. For some reason it was created as a MBR type disk and I need to delete it and recreate it as a GPT disk so that I can extend the D: partition beyond 2TB. So, what is the best way to backup and restore the existing VM in this case?
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Device Manager for Hyper-V server 2012 R2

June 4, 2014, 11:05 am
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Hi ,

We have 2 server running Hyper-v Server 2012 R2 and we are able to RDP and remotely manage it through server manager from a windows 8 system. But unable to see the Device manager.

I am getting the below attached error.

Did anyone face this issue. Please suggest ?

Thanks


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P2V Windows 2000 Server

June 4, 2014, 11:29 am
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I would like to p2V a Windows 2000 SP4 running on a Dell PE 750. I have searched many forums and no one seems to have an answer to do this and suggest other ways to get around this, right on MS documentation it shows that an offline conversion is supported. I don't plan on upgrading Server software and I do not want to do a backup/restore to new image.

Information I am looking for

What Host OS and Hyper-V version do I need to do this with?

Where can I find step by step instructions?

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Hyper-V 2012 redundancy questions

June 4, 2014, 12:47 pm
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Let me start by saying I have Microsoft SQL failover cluster experience.  I also have built 3 Hyper V servers and used them for a while, but I still consider myself relatively new to virtualization.

I need to go beyond single servers and add redundancy into a new deployment.  This will be a big deployment.

I will be using an Equallogic array as a type of SAN architecture for the back end, on 10GIG SFP switches.

I'm building two identical servers for a front end HyperV server.  I'm looking for an active/passive type scenario where if one server fails, the other pick up seamlessly, but they use the same back end data store.

I have enough IOPS and space, and front end server power (processors and 512GB memory) to create 25 virtual servers, then a second front end server just for fail over.

I know HyperV 2012 has new features like a HyperV replica, but I think for my scenario I still need to build a HyperV cluster.  Can anyone confirm? 

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Can I convert a Physical SBS 2003 installed system to a Hyperv Guest ?

June 4, 2014, 1:09 pm
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Current app only works on Windows 2003 & 2008- app currently in beta for 2012, expected october, so we want to ride it out!

We have a SBS 2003 installation with flaky hardware

Would be able convert a SBS 2003 installation - P2V

I know VMWare has a P2V convertor but I don't see one for hyper-v

does existing SBS license allow me to do this ?

JK

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Move saved state .bin and .vsv file to another drive

June 4, 2014, 3:18 pm
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On Win 2008r2 I have Hyper-V running Exchange 2010sp3. The .vhd and snapshots in Hyper-V point to the Q: drive. I don't have any snapshots. The .vhd is indeed on Q:. Hyper-V is set to save state on shutdown. However the saved states are saved to the E: drive. I don't want the .bin and .vsv files on E: because it is running out of space. Why are they saving to E: when everything else points to Q: ? 

Also, E and Q have identical folders \exch2010\virtual machines\84BB95CD-A450-49F1-90B4-8220AAD594XF but the one on Q: is empty. There is an 84BB95CD-A450-49F1-90B4-8220AAD594XF.xml file in Q: as well but it dates to 4/30/2012. The 84BB95CD-A450-49F1-90B4-8220AAD594XF.xml file in E: is from the last reboot for updates. 

Was Hyper-V originally setup on E? Can i just drag the .bin and .vsv files to Q: every time i reboot Exchange? I'd prefer to change the saved state location but see nowhere to do it. Thanks!


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Delayed write errors on Server 2012 VM

June 5, 2014, 6:28 am
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The configuration is a Windows 2012 server running two 2012 servers as VMs. Dell server with PERC 170 controller and 4 disks in One VM seems fine, but the other is throwing a lot of ntfs errors, not all the time, but ongoing bursts of "delayed write failure" and "failed to flush data to the transaction log".

Each VM uses a single VHD file, not compressed, the drive it is on is not fragmented. When I look at the disk manager in the VM, there are two drives shown

TThis problem seems to have occurred recently, the system has been running happily since installation last August. The vhd is about 32GB in size, and the VM provides RDS for remote users.

I did notice that write caching is enabled on the virtual hard settings, but I think this is the default.

Any ideas or suggestions welcome!

Hugh

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Windows Server 2012 R2 Windows Server Backup/Hyper-V Fails. Hyper-V VSS Writer Failure Result 80042336 FIXED!

June 5, 2014, 7:37 am
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I made an astounding discovery this morning.

I have an hp ML350 server with three RAID 1+0 drive arrays that offer three logical disks for use. There is no clustering or SAN involved, just three simple disks. The first is used for the OS, and the other two to hold VHD files for Hyper-V.

I installed Windows Server 2012 R2 fresh with Hyper-V and attempted to use Windows Server Backup to backup the entire server to an external USB drive. The Hyper-V application portion of the backup constantly failed. The Hyper-V VSS Writer returned state 5, Failure Result 80042336, with the Component Message'Could not create the backup checkpoint...; the system cannot find the file specified."

After a 5 day expedition through permissions, registered DLLs and a ton of other stuff, I found the problem.

The VHD files CANNOT be located in the root directory of local disk drives. They MUST be in a folder off the root directory. I confirmed this through multiple A-B tests with the files in the root of a drive, and then in a folder off the root.

Oddly enough, the permissions on the root folder are identical to the folder off the root, so that's not the problem.

On Windows Server 2008 R2 Standard I constantly located my VHD files on the root folder of a drive with no issue.

I hope this spares someone a lot of trouble!


Added update: I should also have said that the four VMs were all shutdown (offline) during the failures. So this had nothing to do with VM-internal snapshots or Integration services. This amounted to a failure of a straight file backup, some of which were related to Hyper-V. And, I believe the REAL cause was the .avhd file (snapshot) could not be created in the first place, and THAT was the file the writer couldn't find.
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Server 2012 Hyper-V replica resync fails...

June 5, 2014, 8:20 am
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A couple of weeks ago we had an outage that prevented a replica from sending changes.  When the outage was resolved, the guest required a resync.  The changes were so large that upon starting the resync the disk filled and resync stopped, and the guest paused.  I fixed the disk space issue and started the guest and resync operation.  However, the resync never fully completed.  Upon review of the eventlogs I found the following events:

Event 33618:  Change tracking for VHD'xxxxx.avhdx' of virtual machine 'guest' is in error state: %%3493462049 (0xD03A0021). (Virtual machine ID xxxxxxxxxxx)

Event 29270:  Resynchronization failed for VM 'guest'. Resynchronization needs to be started again. If this error occurs repeatedly, you can remove replication for this virtual machine, delete the Replica virtual machine, and enable replication again. (Virtual machine ID xxxxxxxxxxx)

Event 32326:  Virtual machine 'guest' requires resynchronization to get back into an operational state. (Virtual machine ID D62FB3F1-BC01-45E2-BF49-xxxxxxxxxxx).

After attempting resync several more times and getting the same result, I removed replication for the guest, and then set it back up. The initial seed using external media import was successful, but the guest now requires resync and it is having the same issue where it never seems to complete and the same 3 events are written to the eventlogs.

Anyone know how I can get this working again?

Thanks in advance for you help!

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Hardware configuration for Server 2012 R2 with Hyper-V role + 2 guest VMs

June 5, 2014, 8:30 am
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I'm planning the deployment of a Windows Server 2012 R2 domain and need some virtualization advice, particularly when it comes to RAM and disk configuration.

My current plan is to purchase one copy of Windows Server 2012 R2 and install it on bare metal with just the Hyper V role enabled (will not be joined to the domain). I will then be using the virtualization rights to install one guest Windows Server 2012 R2 with the Essentials Experience role enabled (so DC/AD/DNS) - we will have over 25 users so cannot take advantage of the Essentials SKU - and one other guest Windows Server 2012 R2 to run as a member file server. I know I will need CALs for Essentials. I will be using local storage on the host.

I did toy with the idea of installing the Essentials server on bare metal, but because I'm going for the W2012R2 standard SKU, it seems silly not to take advantage of the virtualization rights seeing as it won't cost any more money... Is my assumption a good one? I have previous VMWare ESXi experience but no MS Hyper V experience.

I know this type of question is frequent, but it seems hardware sizing rules are different for hypervisor hosts and I'm a bit lost.

RAM

I'm looking at Dell hardware with 32GB RAM - I will be allotting at least 16GB to the Essentials VM. One thing I'm unsure of is how the hypervisor is alloted RAM? How much RAM should it be given? is there some rule of thumb linked to the number of VMs?

Disk config

I've read a lot about the disk configuration and the consensus seems to be to use a hardware RAID 10 configuration for the VM storage and hardware RAID1 for the host OS. Is this overkill? Instead, can everything reside on the RAID10 config? Or is there some other way i'm not aware of?

NIC config

Should the host have its own dedicated NIC and the VMs use another?

Replica DC

I would like to introduce a replica DC for redundancy - cost wise the easiest thing would be to make the second guest VM a DC (no need for second W2012R2 license etc), but opinion seems to differ as to the usefulness of putting a replica DC on the same hardware as the PDC - if the host goes, then everything goes....  Opinions?

thanks for any advice.

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Windows 8 Hyper V export ov vm

June 5, 2014, 2:54 pm
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I am studying for my Installation and Configuration of server 2012r2. I am trying to create a lab environment using Hyper-V on windows 8.1 pro.

First problem I'm having is the program becomes Non-responsive on Exporting the VM, sounds fairly common . Can I copy the VM files manually or with another program ?

Matthew Eden

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Slower IO on Windows 2003 Guest OS on Windows 2012 R2 as Host OS

June 5, 2014, 11:58 pm
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 Hi Anyone

Is there a possibility Guest Windows 2003 virtual machine has slower IOPs running in HyperV Windows 2012 R2 as host OS.

 

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Machine created in Hyper-V not initialize

June 6, 2014, 12:14 am
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is sp1 is required to run service pack 1 to use hyper-v if yes then why hyper-v is given in normal r2

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Failed to get the disk information

June 6, 2014, 3:21 am
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Hello,

I'm getting the following error message on a Hyper-V server:


Log: Microsoft-Windows-Hyper-V-VMMS-Admin
Type: Error
Event: 15268
Agent Time: 2014-06-06 09:51:01Z
Event Time: 07:50:19 AM 6-Jun-2014 UTC
Source: Microsoft-Windows-Hyper-V-VMMS
Category: None
Username: SYSTEM
Computer: SERVER.domain.lan
Description: Failed to get the disk information.

I can't find any information regarding this error message/ID. Is there anyone who received the same error message once?

Kind regards,

Rense Hartog

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VM client hijacks internet from another VM

June 6, 2014, 3:59 am
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Hi,

I'm running 2008 R2 Enterprise, we have 3 VMs (2 server 2008 R2 and one Server 2003 R2) that are all running nicely. They can be seen on the network, can see the internet and can be accessed via the internet.

I'm trying to add two more servers to the same host, a 2008 Web Edition and a 2003 R2.

Individually each server works fine, but if both are running at the same time the 2003 R2 seems to hijack the internet connection from the 2008 Web edition.

If the 2008 Web server is running, then I start the 2003 server, after a period of time that seems to vary the web server looses it's connection and I can then connect to the 2003 server.

This is possibly being triggered when I try and access a website on the 2003 R2 server (MSCRM 3), I'm not totally sure of this yet.

The 2003 server is a copy of a VM that is already running on the host, but I get the same behavior running on a different host with only these two clients.

To get the 2008 server back on line I need to shutdown the 2003 server, then restart the 2008 server while the 2003 server is shut down. Eventually it comes back online. Disconnecting the 2003 server or pausing doesn't help, it needs to be shutdown!

Any ideas would be welcome.

Mark

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Is possible to open and attach virtual disk of running VM ?

June 6, 2014, 8:17 am
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Hello,

I am trying to find how to open and attach virtual disk of running VM for our utility which needs to read content of disk. I tried to open it with VIRTUAL_DISK_ACCESS_ATTACH_RO but it returns error 32. So it seems that disk is used exclusively and not possible to open and attach when VM is started ?

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HyperV 2012 R2 Replica question

June 6, 2014, 9:37 am
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Hello,

We have 2 HyperV 2012R2 Servers. Each of them, for load balancing, runs different VMs. Can we set them to replicate to each other their VMs?

If so, what shall we consider?

Best regards

Kostas

Kostas Backas-Systemgraph Technologies

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