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Network port error

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Hi guys,

 I had this network issue, When I wanted to start one of my VM operating system. It was showing me this kind of error (synthetic ethernet port failed to allocate resources while connection to a virtual network) 

Try this if it works for you guys.

Go to virtual machine setting click on Network Adapter and change the virtual switch option to "Not connected" It worked for me. maybe this solution will help you guys too.

 


Problem with backup and hyper-v on server 2012 - Guest hanging then stopping backup causes hyper-v manager to hang

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Hi,

We have a deployment of 3 x Server 2012 Physical Hosts, each Physical host is running 2 VM's (variety of guest OS 2003, 2008, 2012) and hyper-v replica is enabled on all of the guests.

One of the guests is a 2012 server standard which is being used as a file server and is hosting around 2.5TB of data. With both a 3rd party backup software and WSB backing up to an external USB drive (4TB) the backup gets to just over 1.3TB of data backed up then users complain they are unable to access files on the file server.

We had been running the 3rd party software on all guests with no issues, but the backups are scheduled to run out of hours. Obviously with the amount of data on the file server we expected it to over-run but also hoped that while the backup was running the server should also have been operational! We decided last night to use WSB to see if it was the 3rd party software that was the cause and have found out it isn't!

Just to provide a bit more info, the Servers have plenty of CPU and RAM available for the host and guest. The Host OS runs off 2 x SATA drives in RAID-1 and this particular guest runs off 4 x SATA drives in RAID 10.

While WSB was in progress (at the time of checking when users were complaining) the state of the VM was shown as 'running-critical'. When we stopped the backup it did so quite quickly but the hyper-v manager stopped showing any data on the guests, we were then forced to reboot the host, which also hung on shutdown causing us to have to hard power-cycle the unit.

All the other hosts are fine, and operation of this host is fine, also backup of any of the other guests on this host cause no problems, other than the fact they are small enough to complete their backups out of hours. But surely with VSS backing up during the day shouldnt be a problem (we use WSB to backup physical servers during the day at other sites with no issue)

It now means we only have a full backup of their main file server from the weekend, and its now looking like we will only be able to run another backup this weekend. Obviously there is the replica to go to in the event of a failover, but we need this problem sorting urgently, any help here would be greatly appreciated!

Server 2012 Virtual Machine BSOD after hardware crash - 4 times

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I have now had 4 Server 2012 VMs fail to boot after a hardware failure in the cluster, requiring the servers to be rebuilt. This has happened in a span of 2 months since we started deploying this configuration and using Server 2012.

This has happened at 3 different locations, meaning it is NOT tied to a specific SAN, switch, or server.
-The first and second failures was when the Hyper-v servers both BSOD at the same time, causing the guests to die. BSOD was due to a network driver issue, and both systems receiving the same bad packet.
-The third failure was in our lab as we were building the cluster prior to production deployment. We had a power outage that killed the SAN, but left the storage and switch running.
-The fourth failure was when we had the switch doing iSCSI reboot on us. None of the Server 2008 machines were effected, but 1 of our 2012 Domain Controllers BSOD and needed to be rebuilt from scratch.

Here's the hardware setup for each location. I have this setup in 15+ locations, the problem has happened in different locations, so it is not specific to one location's hardware.

-2 Cisco UCS servers running Server 2012 Datacenter with Hyper-V in a cluster.
-Nimble storage array for iSCSI volumes.
-HP switch for iSCSI backbone.
-All hardware and drivers are being updated at the time of the build.

The dead systems all share these things:
-Running Server 2012 standard
-Domain controller
-created from the same template VHDX file

At this point I have no faith that any VM will survive any sort of hardware crash or power outage. I can see it occasionally causing a VM to not boot after a crash, but we've had 5 system crashes, and of those 5, 4 of them have caused me to rebuild a Server 2012 guest VM. That's an 80% failure rate.

Anyone else experiencing this level of failure?

I've been doing iSCSI VMs on VMware for 6+ years, seen countless crashes, and never had to rebuild a VM because of it. This is my first go at hyper-v. I'm not trying to bash it and say VMware is better, I'm just amazed at what I'm seeing, as it's not expected.

I've followed all the guidelines of MS and the storage vendor for iSCSI configuration. The problem doesn't appear to be storage related though. The VM will boot, so the VHDx file is not corrupt,it just seems that Server 2012 as a VM is not very crash resilient.

I have some systems in the lab now getting ready to ship, I am going to see if I can BSOD a Server 2012 guest running on local storage.

Windows Server 2012 - Can occasionally not access second virtual hard drive inside a VM

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I run Windows Server 2012 RTM Hyper-V and I can occasionally not access the second virtual hard drive (dynamically expanding VHDX) attached to the VM through the virtual SCSI controller. I can however access the first hard drive that is connected with the virtual IDE controller.

I get the following warning in the event log under “Administrative Events” every 30 seconds when this happens:

  • Log Name: System
  • Source: Storvsc
  • ID: Storvsc
  • Message: “Reset to device, \Device\RaidPort0, was issued.”

I get this error once or twice a week and it has caused serious problems since one of the virtual servers that have this problem is a fileserver and the second hard drive contains all the data.

The only quick solution to the problem that I have found is to force the virtual machine to stop using the “Turn Off” feature since a normal shut down does not work (stops at shutting down the event log or similar) and then start the virtual machine again.

You can also wait for about 30 minutes or longer until the disk for some reason becomes accessible again by itself.

My research into this problem shows that:

  • Only 2 of the 10 VMs running Windows Server 2012 RTM that I have, have this problem.
  • Both these VMs have a second virtual hard drive (dynamically expanding VHDX) that cannot be accessed for 30 minutes or longer.
  • Check Disk of the virtual hard drive shows no errors.
  • The second hard drive is attached to the virtual SCSI controller.
  • I can find no problems at all with the physical storage on the (not related) 4 hosts that I have. The problem exists only in the VMs.

I have now attached the second virtual hard drive to the virtual IDE controller to see if this permanently fixes this problem (i.e. does not happen for at least a week).

Is there something wrong with the virtual SCSI controller or the virtual SCSI device driver that comes with Windows Server 2012 RTM? Does anyone else have this problem?

Server 2008r2 under Hyper-V running VERY slowly for no apparent reason

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Hello Everyone,

You will have to excuse me as I'm kind of Hyper-V stupid.  I just started using Windows 8 Enterprise and playing with VMs myself.  I love it.  On my primary machine I made a backup of a hyper-V windows 7 VM.  Now I can surf around, do stupid things, and if my VM gets trashed, delete it and add the base back.  That is my GOOD experience where I have control over things.  Now for the question from my BAD experience:

We moved our local servers to a cloud based service company several months ago.  The theory is that we are completely mobile now and users can connect using their laptops from wherever.  At first, it worked great, but about 5 weeks ago we started seeing our system slow to a crawl once or more times a day.  Our setup:

- 1 file, DNS, RRAS, AD server (4 cores/8GB)
- 2 dedicated workstations (2cores/4GB each)
- 1 RDP server (8 cores/16GB)

Now what happens:

Systems run for awhile and then gets SLOW!!!  1 minute to click on START, 5 minutes to open a file, etc.  I've checked the following:

- RAM - All systems have 50-90% available RAM
- CPU - CPUs idling at 0-15% (mostly from task manager & resource monitor)
- Processes - There are no bloated processes (biggest taking under 200MB)
- Processes - There are no processes pulling major CPU cycles
- Current Disk queue length goes between .01 and 1 (when it hits 1 or above and stays there, the system SLOWS down) I've seen it jump to 5 and 50 as well

Rebooting the server sometimes helps, but recently, after the reboot, things are worse than they were before the reboot and stay that way for 30 minutes to over an hour.

A note, and I'm not sure how to describe this, so I'm going to tell you how I get there:

- Go into resource monitor
- Select the Disk tab
- Click on the Disk Activity Section
- In the Disk Activity section, there are two colored boxes "Disk I/O" and "Highest Active Time"

When nothing is responding and the Disk Queue Length is stuck at 1 or above, The disk I/O sits at 0 for long periods of time and then after multiple minutes of sitting at 0, it will jump up to multiple MB/sec and the disk queue length will go down for a couple of seconds and then it will spike back up and the Disk I/O box will stay at 0 again for several minutes.  On my home computer running hyper-V, this disk activity box is constantly showing Disk I/O and my queue length seldom spikes and stays at a high level.

Does anyone have any ideas?  Anything I can ask the support guys to check into?  Anything I can do to collect information?  I'm stumped.  I just found out today that they were running a Hyper-V based system and have little or no access to configuration, etc. They are sure it's us.  So far, I've:

- Removed anti-virus from our main server
- Disabled a service called PeachtreeSmartPosting because it was having errors (I think the errors are caused by the slowdown, they thought the slowdown was caused by the errors. I disabled the smartposting service and our server still went into it's death spiral today)
- Removed Windows Search Service
- Rummaged through our event viewer: Some Disk errors under the system log: The driver disabled the write cache on device \Device\Harddisk0\DR0 

and

some ESENT/Performance errors under the application log: (x): A request to write to the file <y> at offset ... succeeded, but took an abnormally long time (<some large value> seconds) to be serviced by the OS. This problem is likely due to faulty hardware.  Where the variable x is wuaueng.dll, svchost, Windows, and possibly others and variable y is datastore.edb, j50.chk, j50tmp.log, dhcp.mdb, edbtmp.log, edb.log, j500134D.log (in dhcp\backup\temp), MSS.log, windows.edb, and others.  I pulled the variables from the last 20 or so of these errors.  In addition, between every 20 or 30 of the above errors, I get something like this:

DFSRs (1928) \\.\C:\System Volume Information\DFSR\database_28A4_16A0_A416_7094\dfsr.db: A request to write to the file "\\.\C:\System Volume Information\DFSR\database_28A4_16A0_A416_7094\fsr.log" at offset 4155904 (0x00000000003f6a00) for 262656 (0x00040200) bytes succeeded, but took an abnormally long time (64 seconds) to be serviced by the OS. This problem is likely due to faulty hardware. Please contact your hardware vendor for further assistance diagnosing the problem.

I've got no clue where to go next, and I think the support staff running this are just as baffled.  Any thoughts, suggestions, etc. would be appreciated.

Thanks,

Jeff

SharePoint 2010 VHD Demo Environment

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Hi All,

I am trying to setup SharePoint 2010 VHD Demo Environment(http://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=27417) on my windows 8 machine.

 I get "Video remoting disconnecting" error when I try to open the console.

Please help!

Ameya

Hyper-V 2012 replication

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Hi,

I have 2 test servers which are in the same domain. I want to use kerberos authentication but I am getting same error all the time.

The error is: Hyper-v failed to authenticate using kerberos authentication. The specified target is unknown or unreachable (0x80090303). Hyper-v failed to authenticate the replica server using kerberos.I can ping both name and ip. Dont know why is it unreachable.

This is strange because they are in the same domain. When I test this first time i didnt have problems with it.

Hope that someone can help with this.

My DC is Small Business server and maybe is because of that or.

Best regards/kaktak


Hyper-V 2012 Core host memory usage increases after reboot till all memory is used up

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Dear Forum!

I newly installed hyper-V 2012 (Core) on a Supermicro Mainboard with an ADM Opteron 6344 32GB RAM

System information:

Manufacturer        : Supermicro
Model               : H8SGL
Name                : HYPERV
PrimaryOwnerName    : Windows User
TotalPhysicalMemory : 34341036032

After configuration of the host and two guests with fixed memory (host1: 4GB RAM, host2: 12GB RAM no dynamic memory used) I discovered that after 2 days there was no memory available on the host anymore. The Taskmgr process list shows maxx 2GB used memory, the performance tab shows completely used memory.

I installed all the available updates, rebooted and the memory usage gets back to normal. But after another 2 days the memory on the host was again completely used. There is no third party software installed that would eat up memory. I also tried to set the registry key for limiting host memory to 2048MB with no luck.

I always log out from the server not only disconnecting, because I read that there could be a problem with disconnected RDP sessions.

I tried turning off NUMA on the host, gave less memory to the guests but still the same behavior. When the memory is completely taken by the host I am not able to add a new virtual machine anymore, because the host complains about not enough memory left.

Is there anything I am missing?

Any suggestions on what I could try?


Is this how you would configure HyperV cluster

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Hi!

We have the following hardware.

  • 2 physical servers with 4x1GB nic and 2xHBA (2 ports)
  • 1 SAN box

The 2 physical servers have internal disks that have HyperV 2012 installed. We added a LUN for virtual machine storage and one LUN for Witness disk. We installed failover cluster feature, and added the LUN for CSV so now the LUN is located under C:\clusterStorage on both hosts, and the other disk is located as a Witnessdisk (this witnessdisk have a driveletter so i can see it in explorer, should i remove the drive letter). We configured two teams, 2x1 nic called PRODUCTION and 2x1 nic called for ADMIN. The production network is the network that the virtual machines uses, and the admin is for connection to the hyperv hosts.

So im wondering if we should configure the network different, I have seen people say that you should have a own live migration network, how should we configure this ? If im not wrong, we configure this network and just check that under Networks>Live Migration Settings. My next question is then, what about this Heartbeat, where does this come in, is this hidden in some network settings..:)

Since we have a SAN, I have also looked at Virtual san, but if im not wrong this is used for example if I have a virtual machine that wants to connect directly to a LUN i can add a virtual hba right ?

Please advice in this configuration, and thanks for answers.

Thanks for answers


/Regards Andreas



Hyper-v storage

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We have a 4 nodes cluster hyper-v hosts. All virtual machines are located in one CSV. the CSV is an iscsi folder called VMs. So all Vms files are located in one big folder (with subfolders for each VM). This iscsi folder is located on a Windows 2012 server acting as the iscsi target.

We just got a new SAN and we are planning migrating all the VMs to the SAN instead of the windows 2012 folder.

The question: is it better to create 1 iscsi target on the SAN and transfer all VMs to it? or is it better to create 1 iscsi target per VM?

Thank you for any help you can provide.


-Mehdi

Adding Virtual Machines to a cluster but they don't show in the Roles

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Hello,

I'm new to the clustering and I had a stand alone server with 8 Virtuals running on it.  I create a cluster and joined this server to the cluster. I first tried to figure out how to move the vmachines in to cluster and gave up.  So I just deleted them in Hyper-V manager and copied the vhdx to the LUN on my cluster and went to Roles and clicked New Virtual Machine and selected the hard drive and all seem to work as excepted. Then I noticed the Machine showed back up in Hyper-V manager is that normal? So then I tried this same approach on a second server it seemed to work but the Vmachine does not get added to the Roles only the first machine is listed in the Roles on the Cluster. It does show in the Hyper-V manager.  Am I missing something? 

What I have it a two node cluster both running server 2012  with a P2000 G3 storage.

Thanks 

Randy


I Cant start a virtual machine with Virtual FC Switch attached directly to SAN without FC Switch (MPIO One HBA two ports eahc one) FC Switch is required ?

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I have twoIBMx3650M4with QLogicQLE2562fiber plates2 portseach andare connecteddirectly to the SAN, butI cannotcreatevHBAfromthe administrationof theQLogicbecause Isay I'm notconnected to aConnectionPoint-to-Point .The question is,to usethefiber withinVMs, i need toif or whena switchto performFibreZoningorMaping?,Becauseaccording to mytopologydoes not work not evencreating avirtualswitch andadding itto aVM, I get syntheticfiber channelerrorand theVMdoes not start.

I´m using FC IBM DS3512 SAN Storage, DS Storage Management 10.86 and the latest drivers in that and Windows Server 2012 MPIO and Qlogic.


manyThanks


GusNET


Failed Shared Nothing Migration - Element Not Found (0x80070490)

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Hi Everyone

I am experiencing an error when trying to migrate a virtual machine from one cluster to another.

I have two Hyper V Clusters, OTJHBHVC01 and OTJHBHVC02, the nodes I am using are OTJHBHPV01 and OTJHBHPV05 respectively.

If I remove a virtual machine from the cluster, and attempt to migrate it to a node in the other cluster I am getting the following error:

Event ID 21024 Source: Hyper-V-VMMS

The Virtual Machine Management Service failed to establish a connection for a Virtual Machine migration because the destination host rejected the request: Element not found. (0x80070490).

The Virtual Machine Management Service failed to establish a connection for a Virtual Machine migration with host 'OTJHBHPV05': Element not found. (0x80070490).

Virtual machine migration operation for 'OTJHBNMS01' failed at migration source 'OTJHBHPV01'. (Virtual machine ID A1226C5A-C1F3-44EC-A5F1-F06BBE671320)

As mentioned, I remove the Virtual Machine from the cluster, In the Hyper-V MMC I then right click, select "Move" - Move the Virtual Machine, I select the destination Hyper-V host (node) not the cluster name. Select "Move the virtual machine's data to a single location" Choose a location on one of the Clustered Shared Volumes that has enough space. And proceed with the move. The migration runs till about 70% of the way of the progress bar until I receive the error.

I cant seem to upload screenshots yet, even though I have verified my Microsoft Account.

I have searched, but have been unable to find any similar posts. I have come across one post where System Center Virtual Machine Manager was involved, but we are not using SCVMM. I have tried the steps suggested in the post but they have not worked for me.

I have tried restarting the Virtual Machine Management Service, as well as restarting both Hyper V hosts, but still receive the error.

I have tried this in both directions, from any of the nodes in my cluster and still receive this error. Live Migrations within the clusters work perfectly.

All servers are members of the same domain. The user logged in performing the action is a Domain Administrator.

Both Hyper V Servers have been enabled to accept live migrations using Credential Security Support Provider, not Kerberos (We are not using remote tools)

I have also tried this on multiple Virtual Machines, all with the same result.

I am running Windows Server 2012, Datacenter edition.

Failover Cluster Validation tests report no errors or serious warnings.

We were able to do Shared nothing migrations about 2 months ago, nothing has been changed on the Cluster with exception of Windows updates and the installation of the following KB updates: KB2813630 and KB2823643. These two updates were installed to try and resolve an issue we were experiencing with iSCSI which we since resolved by switching to Fibre Channel Controllers on our storage device.

Would appreciate any help or suggestions!

Thanks

Leigh


Corrupted multiple VHD files running on an iscsi san after server reboot

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I recently implemented a new server with server 2012 enterprise, and attached a synology DS1512+ iscsi san. We have about 22 virtuals running

 

Everything was working fine, and getting great results. But, as typical, the machine need to reboot for an update. After coming back online, roughly half(only the most important, of course) of the virtual machine housed on the iscsi san became corrupt or the configurations became corrupt, and would not start. Luckily I was able to copy the VHD files of a few of them(once again, low priority ones) to another Hyper v server, and bring them back online.

 

After another reboot, we lost a couple more virtual machines.

 

I was thinking about placing a delayed start on the hyper v services on startup, thinking that this would make sure that the iscsi was connected prior to attempt to start all virtuals.

 

Any ideas???

Hyper-V 2012: Backup fails with "The number of volumes reverted does not match the number of volumes in the snapshot set for virtual machine"

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Hi Everyone,

I've recently P2V'd two Dell servers running Server 2003 R2 to a Hyper-V 2012 box. The configuration of the each server is very similar, each one now having one virtualised disk containing 3 partitions - Dell Utility, Windows, Data. I do a daily backup of the Hyper-V host including the online VMs. One server backs up fine with no issues. However the other server gives me the following error at the beginning of the backup:

Log Name:      Microsoft-Windows-Hyper-V-VMMS-Admin
Source:        Microsoft-Windows-Hyper-V-VMMS
Date:          12/06/2013 20:02:52
Event ID:      10112
Task Category: None
Level:         Error
Keywords:      
User:          SYSTEM
Computer:      HYPERV01
Description:
The number of volumes reverted does not match the number of volumes in the snapshot set for virtual machine 'SAPServer' (Virtual machine ID C905ECC8-B247-42D7-B986-F5F97FD87B3B).

I don't see any event log errors in the guest vm at this time

I've searched for solutions and most refer to Server 2008 resolving the above with hotfixes, rollups etc. The only one that could possibly be applicable is maybe kb975695 which refers to a disk signature clash. (Sorry- can't post link until my account is verified!). I tried the resolution here but to no avail. I can also successfully mount the vhdx when the vm is offline with no issues.

As an interim measure I decided to do an in-vm backup to a passthough USB drive connect to the above problem vm.

The really curious part is the Hyper-V backup of the online VMs works OK and gives no error when the passthrough disk is attached. So obviously changing the drive configuration seems to do something.

Any ideas ???

Rgds,

Deisceart


Hyper-V deletes iso on network share

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This is my first attempt to use Hyper-V on Windows 8 (or Hyper-V in general), though in the past I have created many virtual machines using Virtual PC, Virtual Server and VMWare Server and Workstation.

I tried to set up a Windows 7 x86 virtual machine, using a .iso file (obtained from MSDN) on a network share. When I pressed the "Finish" button, the Hyper-V Manager said I did not have enough privilege to open the .iso file. So, rather than mess with the permissions (which always confuse me) I decided to copy the .iso to the local Windows 8 machine over my network. But the .iso file was no longer there -- Hyper-V had deleted it. Finding this hard to believe I repeated the exercise with the x64 .iso version, and the same thing happened.

What is going on? How can the Hyper-V Manager delete a file that it says I do not have permission to open.

Surely this is a bug...


David Wilkinson | Visual C++ MVP

Integration services upgrade fails

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I have a 2008 R2 VM running on a Hyper-v 2012 server.  I would like to update the VM integration services to the newer 2012 version.  When I insert the integration services iso it asks if I want to upgrade this installation and I click OK.  The installation starts and when it gets to the installing guest componets step if fails with the error "and error has occurred: one of the update processes returned error code 3017"

I've tried turning off the offering of integration services on the VM settings.

Delete the wdf01000.sys and wdfldr.sys files from c:\windows\system32\drivers

I have tried stopping the hyper-v services on the VM

Looked at the detect HAL setting in msconfig, but that is not an option in R2 apparently.

I suspect this VM would also not have installed updated integration services when it was on a 2008 hyper-v host either, but not positive.


Mark

Capacity planner Hyper-V Replica - Windows 2012 in Spanish

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Hi,

   I need to know if is posible to run capacity planner in Windows 2012 in spanish. The installation is in spanish. When i run the capacity planner, it does not show the VM.

When the OS is in english, it does not problem.

BR.

Juan.

Standalone Hyper-V is too painful to use

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This is really a complaint not a question.  I've been using the free version of VMware ESXi for development testing for years.  I keep reading about how Hyper-V is catching up to VMware in features.  I was excited about the free stand-alone version and decided to try it out.  I downloaded the Hyper-V 2012 RC standalone version and installed it.  This thing is a trainwreck!  There is not a chance in hell that anyone will ever use this thing in scenarios like mine.  It obviously intented to be used by IT Geniuses in a domain only.  I would really like a version that I can up and running in less than half an hour like esxi.  How the heck is anyone going to evaluate it this in a reasonable manner?  I feel like it was just thrown out there so Microsoft could claim they have a free virtualization server like MS?

Steps for free ESXi.

1. Download from website burn to CD/DVD.

2. Boot from disc, follow steps to overwrite hard drive and install.

3. After reboot, config management IP address.

4. Go back to my desk and open my web browser to Management IP and download client.

5. Install ESX client and start running VMs!

Steps for Hyper-V

1. Download from website burn to CD/DVD.

2. Boot from disc, follow steps to overwrite hard drive and install.

3. After reboot, config management IP address.

4. Scour the internet for server tools that install the Hyper-V management snap-in for Win 7.

5. Install server management tools pack.

6. Go to add/remove and enable the Hyper-V snap-in.

7. Open Hypver-V snap-in and connect TRY to connect to box.

8. Receive generic authentication error message.

9. Spend several hours scouring the internet looking for registry hacks, firewall hacks that actually allow you to connect to a damn hyper-v box!

10. Eventually you come across the website/project. http://archive.msdn.microsoft.com/HVRemote

This site walks you through all the script changes/reboots you have to make to connect to bloody hyper-v! 

Here is what I would prefer

I don't want to download any tools at all.  I just want a HTML5 web server on this box that allows me to do everything I can from the  Hyper-V console and doesn't make me configure anything other than a password.  It would be great if it was themed similar to the new Windows Azure Virtual Machines console.  I doesn't have to provide like a built-in viewer to actually interact with the VMs, I would be happy with a remote desktop style connection.

Hyper-V VMs ping host, but not each other... why?

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I've got my Hyper-V Server and created 2 VM's (both identical with different computer names, both on the domain, different static IPs, on same subnet, same network mask, etc).

My virtual switch is set at External with the default settings. My server has 1 NIC connected and it's using that so the vm's can hit the internet.

Problem is, the VMs themselves cannot talk to each other but they can both ping and get to resources from my Hyper-V server.  

What do I have to do to fix this? 

My static IP settings are:
172.16.100.20-25 (node ips I'm going to use)
172.16.100.1 (router)
172.16.100.10 (hyper v server ip)
255.255.240.0 (network mask)

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