(Hyper-V Failover Cluster) highly available VM replicated on standalone Hyper-V replica server.

April 16, 2013, 7:12 am

≫ Next: Hyper-V Replica with SAN Storage

≪ Previous: Snapshot gives unknown error

Hello there !

I am experiencing an issue regarding the behaviour of my replication architechture.

I am running highly available VM on a WS2012 Hyper-V Cluster (2 Hyper-V nodes). The storage (Netapp FAS2240) is attached via iSCSI. CSV is enabled.

Everything works so far regarding the cluster itself. My VM are replicated on a third WS2012 Hyper-V Server outside the cluster (same domain). Replication is OK, failover test OK, planned Failover OK, reverse replication OK !

The problem is when I am simulating a power outage on one of the cluster nodes, (everything operates as expected), the VM are rebooted on the surviving node but the status of the replication goes to "Critical" full resynchronization is needed then (error Hyper-v-vmms Id 32544 : virtual disk modified by compaction, expansion or offline) ?!

Is this a normal behaviour ? Or should the replication continues normally despite the node failover ?

Please help.

BRGDS

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Hyper-V Replica with SAN Storage

April 17, 2013, 2:27 am

≫ Next: BAse file

≪ Previous: (Hyper-V Failover Cluster) highly available VM replicated on standalone Hyper-V replica server.

I am planning to deploy Hyper-v Replica with SAN Storage as I need more disk space for the Virtual Machines.

Can anybody share their thought the drawbacks and advantages of this deployment.

Regards

Muralee

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BAse file

April 17, 2013, 2:46 am

≫ Next: Mystery AVHD file and no snapshots lists in Hyper-v

≪ Previous: Hyper-V Replica with SAN Storage

What is base.vhd file , which we use to extract VM's?

how to create Base File.. or Parent disk..

How differencing disk works with Parent Disk

I am to confuse with all these concept , please help me to resolve it.

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Mystery AVHD file and no snapshots lists in Hyper-v

September 13, 2009, 12:46 pm

≫ Next: Change Hyper-V Server 2008 Administrator password

≪ Previous: BAse file

Need some serious help here.

I was the victim of the runaway shapshot eating all the availble disk space last year - that was a fun 30 hours to fix. I still hold the record of having a 400GB snapshot. Snapshot are evil in production - never to be used again.

Anyway...

I have one virtualized exchange server and in Hyper-V mangare, there is no snapshots listed (this is good, since it is an Exchange server and it is in production).

But, we are running out of diskpace again. I check the drive and there is a 151GB snapshot (which is active and being used by the Exchange server). A AVHD file - your basic snapshot differential file.

So, it looks like this blight of snapshots is not completely gone. How do I get rid of this snapshot?

I would like some suggestions before I start working on a production system.

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Change Hyper-V Server 2008 Administrator password

April 17, 2013, 3:38 am

≫ Next: Server 2012 Hyper-V Team

≪ Previous: Mystery AVHD file and no snapshots lists in Hyper-v

Hi! I have a machine with Microsoft Hyper-V Server 2008 running. I put the Administrator password when I installed the system, but now... How can I change it?

I access the Hyper-V machine through Remote Desktop, and I can't see any option to change the Administrator password in the auto launched menu, only a option to add local admin accounts. The machine is not in a Domain.

Can I do from command line?

I also tried to using mmc from my computer, and selecting "connect to other server", but it gives me a error like "winrm client cannot process the request"

Thanks

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Server 2012 Hyper-V Team

April 6, 2013, 2:08 pm

≫ Next: Hyper-V DHCP Issue.

≪ Previous: Change Hyper-V Server 2008 Administrator password

Hey all, I plan to setup my teams as follows:

6 x 1GB VM Ports (Teamed using three ports on quad port card 1 and three ports on quad port card 2)
2 x 1GB Management\Cluster Communication Ports (Teamed on the two on-board\embedded)
2 x 1GB Live Migration Ports (Teamed via one port on quad port card 1 and one port on quad port card 2)

What I am wondering if it is ok to run the physcial connections for the team between two switches that are NOT stacked? I had planned to use an LACP etherchannel for each team. But I am wondering since the switches are not stacked if I need to use switch independant mode.

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Hyper-V DHCP Issue.

April 17, 2013, 6:26 am

≫ Next: Hyper V setup with NIC Cards

≪ Previous: Server 2012 Hyper-V Team

i have installed Server 2008R2 X64 Sp1 on host and install Hyper-V role on it.

Now i have install all my serves including Domain and Exchange and TMG. i have created to networks on one host [1st external] and [2nd External for Internet usages of VM].

i have setup DHCP in domain which is Hyper-v guest. DHCP will issue IP address to system only when i enters MAC id in DHCP console. now the issue is whenever a new machine or laptop connect to my network it get accessible hyper-v guest like my storage and WebServer. it gets ipp of different range my network range is 192.168.0.XXX

Akshay Pate

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Hyper V setup with NIC Cards

April 16, 2013, 11:10 pm

≫ Next: Separate VLAN still necessary for VM NLB cluster nodes?

≪ Previous: Hyper-V DHCP Issue.

HI Guys,

I have 2 Windows 2012 Servers and each one has 2 NIC cards. I am looking to make Hyper V Setup with clustering. I cant afford to add more NIC at this Moment and want to make a high available setup. How I am trying to use both cards.

1st NIC : OS Management , Clustering , Heartbeat

2nd NIC : Only for Guest VMs.

I am using SAN Storage using FC HBA.

Please let me know if it is correct setup with 2 NIC.

Regards

Usman Ghani

Usman Ghani - MCITP Exchange 2010

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Separate VLAN still necessary for VM NLB cluster nodes?

April 17, 2013, 2:58 pm

≫ Next: deployment of hyper v server 2012

≪ Previous: Hyper V setup with NIC Cards

Hi Folks,

In the past, it was always recommended to either use multicast for NLB, or put the unicast NLB NIC's in a separate small VLAN to avoid switch-flooding because the switch could not assign the NLB MAC to a single port and hence would flood it to all ports.

I'm wondering what the recommendation is if one is using two NLB cluster nodes on the same Hyper-V host\cluster? It seems to me that even though the same NLB MAC address will be assigned to multiple NLB hosts, the switch will still be able to assign that MAC to a single switch port (connected to the Hyper-V host), and hence will not flood the entire VLAN\subnet. Does this obviate the need for a separate VLAN for that NLB cluster?

Would there be negative ramifications for other VM's on that Hyper-V host's same virtual network? Will the host still flood it to every port on its virtual switch and hence flood all other VM's?

Thanks for any info,

ianc

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deployment of hyper v server 2012

April 17, 2013, 11:28 am

≫ Next: Allocate the same VHD between 2 VM's

≪ Previous: Separate VLAN still necessary for VM NLB cluster nodes?

Hi guys,

Hope you are doing fine. Normally if we have to install a server OS on a hardware (which consists of 5 HDD's), I think the best practice would be:

(1) Raid 1 using 2 HDD's to install the OS

(2) Raid 5 using the 3 other HDD's for data.

I mean that's what I do usually.

But now I want to use Hyper V Server 2012 with the same hardware and install 2 virtual machines. What is the best practice now?

- Still Raid 1 with 2 HDD's and install Hyper V Server 2012

-Then Raid 5 where the virtual machines will be stored?

PLease advise best practice.

Thanks.

Ashley

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Allocate the same VHD between 2 VM's

April 17, 2013, 2:19 pm

≫ Next: Installing Windows Driver Framework.

≪ Previous: deployment of hyper v server 2012

Hi, i'm migrating a test enviroment from Oracle VirtualBox to Hyper-V 2012 and i'm facing a big challenge.

The test enviroment consists on two Linux VM's that run Oracle RAC. In the VirtualBox enviroment, i'm able to share a vhd disk between the VM's (both of them see the same disk, similiar as a storage), but as far as i know, Hyper-V doesn't have this kind of option.

I'm not in a situation to use a differencing disk, since the two VM's need to be able to see the same disk.

I hope that someone can help me with this.

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Installing Windows Driver Framework.

April 14, 2013, 5:47 am

≫ Next: Unable to install Server 2008 R2 on Windows 8 Hyper-V, almost completes then blue screen

≪ Previous: Allocate the same VHD between 2 VM's

I've just bought a couple of new servers running Windows 2012, I'm stuck trying to shift a guest Hyper V machine from our old Windows 2008 server. I can copy the machine over OK, but I cannot get the updated Hyper-V integration services installed. On running the new integration services, it throws up a dialogue and I can see it updates the HAL, but then seems to be stuck in a loop saying "Installing Windows Driver Framework". The guest O/S is SBS2008. I have established that this isn't just a 2012 issue for me, as see the exact same issue if I shift the guest to a spare Windows 2008 R2 system (running Enterprise). The source system where the guest is running quite happily and has done for 3 years is 2008 R2 standard.

Worth adding that I also seem unable to add a legacy network adapter, and the guest server is bang up to date with regard to windows updates.

This has stopped my migration dead in its tracks and also given me big doubts over our backup strategy. Can anyone give me any pointers here please?

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Unable to install Server 2008 R2 on Windows 8 Hyper-V, almost completes then blue screen

April 17, 2013, 3:02 pm

≫ Next: Virtual Network adaptor not appearing for SBS 2008 Hyper-V

≪ Previous: Installing Windows Driver Framework.

My machine is Intel i7 920, 9GB of RAM, 64bit with a 256GB Samsung 840 Pro SSD.

I have a pretty fresh Win 8 install with Hyper-V. I created a new Hyper-V virtual machine with 2048 dynamic memory and 100 GB disk space, then I reference a Server 2008 R2 ISO that I downloaded using my MSDN account, specifically en_windows_server_2008_r2_standard_enterprise_datacenter_and_web_with_sp1_debug_checked_build_x64_dvd_619600.iso.

The install gets to "Completing installation..." then fails and blue screens. I am not yet allowed to post screen shots to this forum unfortunately. Any idea what could be wrong?

I can't post links either, but remove the space to see the images.

http://i.imgur.com/vAiz1RG .png

http://i.imgur.com/gezoevE .png

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Virtual Network adaptor not appearing for SBS 2008 Hyper-V

April 17, 2013, 8:50 am

≫ Next: Access Device Manager in Hyper-V 2012

≪ Previous: Unable to install Server 2008 R2 on Windows 8 Hyper-V, almost completes then blue screen

Last night I virtualized our SBS 2008 server and started it up on Server 2012. The problem I ran into is in system devices there are 2 entries for "Microsoft Hyper-V Virtual Machine Bus" and I believe one of them is supposed to be the Network Adaptor.

I have successfully VM'd 2 other servers on this 2012 Server so I know it can work (one of those is server 2008...just not SBS).

The only way I could get it to recognize the network adaptor is if I added a legacy adaptor. Then the SBS would add a "Intel 21140-Based PCI Fast Ethernet Adapter (Emulated)". This worked but the speed is extremely slow (obviously due to the legacy).

How can I add the non-legacy network adaptor and have it be recognized? I tried running MSCONFIG and selecting "Detect HAL" under the advanced boot options but that didn't work.

Any help is appreciated. Thanks.

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Access Device Manager in Hyper-V 2012

September 6, 2012, 1:58 am

≫ Next: C: Drive shows less size than original size assigned

≪ Previous: Virtual Network adaptor not appearing for SBS 2008 Hyper-V

When I try accessing Hyper-V Server 2012's Device Manager via MMC I get "Make Sure that this computer is on the network, has remote administration enabled, and is running the "Plug and Play" and "Remote registry" services.

The Error Was: "The machine selected for remote communication is not available at this time.

I disabled the Hyper-V Firewall and followed the steps outlined here for "Allow remote access to the Plug and Play interface":
http://mikefrobbins.com/2010/12/02/enabling-remote-access-to-device-manager-on-server-core/

Any ideas?

The Hyper-V Manager works as-well-as the Policy Editor, just not Device Manager.

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C: Drive shows less size than original size assigned

April 17, 2013, 11:07 pm

≫ Next: HyperV guest loads slow on Win2008R2

≪ Previous: Access Device Manager in Hyper-V 2012

Hi, I'am new in Hyper-V. One of my client using Hyper-v host in windows server 2008 and having issue on their internal C:/ drive size assigned.

The C:/ drive shows 50GB size and 7GB free space. When I check in Disk management, the storage assigned to C:/ drive which is "Disk 0" is 450GB. How to make the C:/ drive have the original assigned drive size?

Hope can get some help here.

Thank you very much.

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HyperV guest loads slow on Win2008R2

March 20, 2013, 6:49 am

≫ Next: Undoing Hyper-V Cluster Migration Wizard Configuration

≪ Previous: C: Drive shows less size than original size assigned

this is by far one of the strangest things I have seen. I have a win 2008R2 cluster with a CSV. the CSV itself is on an iSCSI storage (hitachi HUS 110) basic config of the two hosts in the cluster is

Dell R610
Win 2008 R2 Enterprise with all patches
64GB
1 NIC for host access
2 NICs for guest VM access
2 NICs for iSCSI

these machine work great and I can load a 2008R2 test guest machine on them in less than 90 seconds

after the above config is running for over a year, I now need to add a new host. the new host is

Dell R620 (Still intel but different CPU)
same Win 2008 R2 Enterprise with all patches
64GB
1 NIC for host access
2 NICs for guest VM access
2 NICs for iSCSI

I added this new host to the domain and to the cluster, I gave it access to the CSV and I tried loading the same guest machine that loads in 90 seconds in the other hosts. the machine loads in about 6 minutes. no matter how many times I try this the old hosts load the machine in about 90 seconds and this new host in around 6 minutes

to eliminate any problems with the iSCSI connection, I added a new LUN and directly accessed it from the new host and I was working at around 300MB/s so no problem there. I also tested the connection between the other hosts and the new one and network is working fine there too.

to eliminate problems in HyperV, I copied the machine to the local disk of the new host and it loaded in less than 20 seconds.

now is the point were things get a lot stranger: in my tests I tried installing a fresh windows guest machine to the CSV from the new host. I noticed that while the fresh windows was installing, my test guest was loading in less than 90 seconds even on the new host (I repeated this a few times). If I paused the fresh install guest and tried loading the test guest again it loaded in 6 minutes. and again after I resumed the guest installation the test guest loaded fast.

after the fresh windows was also loaded, I ran tests loading the fresh window and my test machine. each one of them loaded in about 5-6 minutes when I tried loading them separately. however when I started both of them in the same time they both loaded in around 2.5 minutes

it seems that the iSCSI disk access is only working if it is under some load (although I never got to above 10% utilization according to the task manager)

does anyone have any idea what could be the problem?

Dani Avni

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Undoing Hyper-V Cluster Migration Wizard Configuration

April 18, 2013, 1:59 am

≫ Next: Any Known Issues With 2012 Clusters And Intermittent Network Drops For Guests Under High Load?

≪ Previous: HyperV guest loads slow on Win2008R2

Hi,

I did a successful migration of a 2008R2 cluster to 2012 using the wizard in failover cluster manager activated by running "Migrate Roles..." (used the following for guidancehttp://blogs.msdn.com/b/clustering/archive/2012/06/25/10323434.aspx).

Everything worked fine from the perspective of the migration itself, but after a week we had to rollback to the 2008R2 cluster (as we were getting intermittent network drops and couldn't pin down the cause). The rollback also worked fine by just taking the resources offline in the 2012 and re-activating them in the 2008R2 cluster.

It will take us some time to get to the bottom of the issue, but that leads me to the problem of doing the migration again once it is all sorted (the problem being that the configuration on the 2012 cluster is stale).

Is it safe to simply delete everything (disk resources, virtual machines, etc) from the 2012 failover cluster manager so that we once again have an empty environment for running the cluster migration wizard?

I am worried about for instance not being able to delete a virtual machine configuration if its clustered resource is offline - I am also thinking maybe destroy the cluster and re-create, but again what if it errors during the destroy because of offline resources and gets itself into a bad state requiring loads of manual clean up and no confidence that it is back to its clean state. I don't have the ability to test this so I want to be sure (if anyone has any advice) before I do anything!

Cheers

Dan

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Any Known Issues With 2012 Clusters And Intermittent Network Drops For Guests Under High Load?

April 18, 2013, 2:08 am

≫ Next: Virtual Test Lab ( Base-Configuration) Building

≪ Previous: Undoing Hyper-V Cluster Migration Wizard Configuration

Hi,

When comparing running the same processes on a 2008R2 cluster versus a 2012 cluster, we are getting intermittent network drops on the 2012 vm that do not ever occur on the 2008R2 vm. The scenario is reading large files (50GB) from the virtual machine to a physical machine and then the physical machine writing back to another location on the virtual machine.

A colleague has mentioned he saw that there was a known issue in 2012 Hyper-V regarding network drops under heavy loading that has already had a hotfix released, but we can no longer find this - does anybody know if this is available still?

Also, are there any obvious differences between the virtual adapters in 2008R2 and 2012 (or the networking in general) that might contribute to this? The hardware is at face value identically specified so we are focusing on the Hyper-V differences to start with.

Cheers

Dan

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Virtual Test Lab ( Base-Configuration) Building

April 2, 2011, 7:12 am

≫ Next: Create Collection - Pooled machines on CSV fails

≪ Previous: Any Known Issues With 2012 Clusters And Intermittent Network Drops For Guests Under High Load?

Hi guys,

Im trying to build a virtual test labs on Hyper-v. I've managed to finish building almost the devices from the base-configuration. But there's something wrong. Can some one give me a hints pls .

As anyone should've known about the base-configuration, there're 5 PCs for the test labs. Im having some pinging problems from that basic topology. Somehow, i can't ping from EDGE1 (10.0.0.2 ) to DC1's Corpnet2 Interface( 10.0.2.1 ) even i added a static route from EDGE1 to that interface ( Here's the command : route add 10.0.2.0 255.255.255.0 10.0.0.1 ).

Anyone has an idea why this happens ?

Thanks in advance.

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