Dynamic memory freezes

June 12, 2014, 5:46 am

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Hi guys,

we are using three node cluster with Windows Server 2012R2. Our virtual machines are virtualdesktops with Windows 8.1 guest OS, 4 vCPU and 8 GB of dynamic memory.Sometimes dynamic memory stops working, guest OS is not able to allocate more RAM and starts to swap. This swapping slows performance of all our virtual machines, sinceall virtual machines are on same cluster shared volume. This happens at random RAM amount allocated, for example at 2.6 GB,which is way below our 8 GB limit.

Live migration helps to solve this issue for migrated VM, after live migration the guest OS is able to allocatemore ram and starts to work properly, swapping disappears. However after some time, problem appears on other VM.

Our physical machines have 2x 10core Xeon and 394 GB of RAM. Only about 30% of RAM is used, so there is free space for all virtual machines. But we need to solve this issue so dynamic RAM starts to work properly.

Do you have similar experience?

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Resource metering problem

June 12, 2014, 6:29 am

≫ Next: Capacity Planning for Hyper-V individual host and Cluster

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Hi guys,

I am using a 3-node WS 2012 R2 Hyper-V cluster. For all virtual machines I enabled resource metering. However, on a random basis Measure-VM stops displaying numbers, it just returns blank fields instead of values...resource metering is still enabled on a VM, but all values are empty. This happens to random VMs, while resource metering for all other VMs keeps working properly.

The only workaround is to disable & enable resource metering, however this resets values which is obviously a problem.

Has anyone had this problem?

Capacity Planning for Hyper-V individual host and Cluster

June 12, 2014, 2:36 am

≫ Next: Hyper-V over SMB 3 running slower than expected.

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Hi Experts

I need to know some basic idea about Capacity planning for Hyper-V which requires Capacity Planning for Hyper-V individual host and Cluster.

I got attached info on websites but still not clear. Can someone link me to an effective website or help me to calculate the required sizing. W

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Regards Suman B. Singh

Hyper-V over SMB 3 running slower than expected.

November 5, 2013, 2:07 am

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Hi,

Currently in the process of evaluating Server 2012 R2 with storage spaces/smb 3/ssd tiering etc...

My test setup is the following: 

1x Server 2012 R2 with 2x SSD and 2x Sata drives in a virtual disk with 75GB SSD tier and 1000GB Sata Tier.  10GB write-back cache.  The virtual disk is shared as \\fs-dev\storage\

network for above is a dual port NIC teamed with then two virtual interfaces on two different vlans.

1x Windows 8.1 Pro with hyper-v role installed.  Single NIC with hyper-v switch attached and allowing management operating system to share enabled.  

If I do a straight file copy from the file server to the workstation in either direction I max out the single NIC and get 110MB/s.  I can also see that the SMB 3 multi chanel is working as expected on the server and is load balancing across the two virtual NIC's

If I boot up a vm on the workstation with all its files on the remote server share.  The performance is considerably worse.  Sequential read writes are around the 60MB/s mark and random 4k read/write are ok, but certainly worse than expected.

I've bench marked the storage space directly on the server and can confirm it is easily capable of better performance that this.  All NIC's are 1Gbe

Note that both machines are at least quad core 3.6Ghz cpu's with 8GB ram so there should be no issues there.

Any suggestions on how to troubleshoot further or what might be the issue?  

Client Hyper V and serial port

June 12, 2014, 5:52 am

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Hi Guys

I want to use client hyper v in windows 8 Professional

There is a legacy application that runs on xp and uses a serial port

So the xp machine will be a virtual, can client hyper v support com port so that the application will work

Additional address on network adapter will not respond to ping

June 12, 2014, 7:48 am

≫ Next: Time Sync - Ben Armstrong's recommendation - FSMO PDC in VM

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I have a Sever 2012/Exchange 2013 setup. When I add the legacy IP address as a secondary address to the new servers adapter, it will not respond to ping. It will either return destination unreachable or request timed out. Did I miss something additional I need to do to bring this address online? I think that until I get this resolved, they will not be able to relay smtp traffic through the new server.

Time Sync - Ben Armstrong's recommendation - FSMO PDC in VM

June 12, 2014, 2:29 am

≫ Next: Windows 2008 r2 guests blue screen on Windows 2012 R2 Hyper-V Cluster with e5 2670-v2 processors

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Hi,

we have difficulties with Time-Sync in a Server 2008 R2 Environment, running the FSMO-PDC-Role as a VM on Hyper-V (time is false, Server marked as falseticker, Event ID 50 ...).

ther are many articles by MS about the Hyper-V time integration Services - pro and con.   

Ben had recommend the time Integration ins his blog and said that he will discuss the different recommendations with other MS-Teams. This has been in 2010 - is there any result? What is today the recommendation? Is it the same for 2008r2 an 2012R2?

http://blogs.msdn.com/b/virtual_pc_guy/archive/2010/11/19/time-synchronization-in-hyper-v.aspx?PageIndex=3#comments

I would be happy to hear someting from Ben or someone else out of the Hyper-V-Team.

Thanks

Best regards Thomas

Windows 2008 r2 guests blue screen on Windows 2012 R2 Hyper-V Cluster with e5 2670-v2 processors

May 15, 2014, 5:50 am

≫ Next: Migrating & managing User profile and data in VDI

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Hello all,

We have a new hyper-v infrastructure deployed in two brand new Dell R720 Servers with 384GB of Memory and dual Intel e5 2670-v2 processors. This infrastructure is replacing an existing hyper-v 2008 R2 and all the guests are being migrated to this new cluster. The issue we are seeing is our 2008 r2 guests blue screening ocasionally with 0x0000001a,0x0000004e or 0x00000050 bugchecks.

All this guests are configured with dynamic memory and with the integration components up to date. These same guests were running with no problems in the hyper-v 2008r2 cluster.

When searching i found this article from vmware that pretty much describes what we are facing:

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2073791

Are you aware of the same problem with this kindd of hardware on windows 2012 r2 hyper-v?

Thanks!

 

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Nuno Carvalho

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Migrating & managing User profile and data in VDI

March 20, 2012, 8:32 am

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Hi,

Just wanted to know what are the best ways of migrating and managing User profiles and Data in Desktop virtualization\VDI?

Looking for some info from best way\tool to migrate user profile and data from physical to virtual in case of pooled and personal desktop environment.

How do we deal with the users those has local profiles and data and now they will be moving to VDI environment as personalized desktop user?

Regards, Thanks

Windows Server 2012 R2 Hyper-V in Domain for Migration.

June 12, 2014, 12:13 am

≫ Next: Network adapter configuration error after quick migrate of stopped VM in 2012

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I have setup 3 server with windows hyper-v server 2012 R2 & currently i am managing them from remote management. 

now i am thinking take all 3 hyper-v in domain network to use "Nothing shared Migration"feature which is in hyper-v 3.

can we do this with hyper-v server 2012 R2. i want to that my users can keep access there vps from anywhere and in case of any issue take place in my network then i can move my VPS to another hyper-v server and mean while user keeps accessing them. is it possible.

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Akshay Pate

Network adapter configuration error after quick migrate of stopped VM in 2012

November 30, 2012, 6:00 pm

≫ Next: Peachtree PAWEncrypt AcquireOurContainer Error Hyper-V

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We've got a couple of Windows 2012 / Hyper-V 3 clusters, and I have a problem with network adapters on them.

If the VM is powered off, and I move it to another host (quick migration via Failover Cluster Manager), the network adapter loses its connection to the virtual switch - it turns to "Configuration Error".

If it's powered on, both live migration and quick migration work fine.

It's possible to demonstrate on an empty VM. I created a new VM via the Failover Cluster Manager (ie not via Hyper-V manager on one of the nodes). One NIC, attached to the single VSwitch we have. Not much memory, disk. Don't need to install an OS.

Quick migrate with the power off, and it fails to pick up the VSwitch on the next host.

Turn it on, and live migration and quick migration both work fine.

Is this supposed to happen, or a buglet in 2012?

Peachtree PAWEncrypt AcquireOurContainer Error Hyper-V

March 4, 2014, 7:07 am

≫ Next: server 2012 hyper-v vSwitch performance is terrible

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Alright so i know there's posts for this all over the internet, but i haven't seen a case of the error in the same environment that Ive gotten the error in. So to anyone who isn't familiar with the error:

It occurs with the Sage50/Peach tree software and has either something to do with .net or is a windows related issue. Sage50/Peach tree suggests reinstalling windows, or deleting the user account that is causing the error and recreating the account in order to fix it(which on a working domain is obviously not a good decision).

In my company we are running Hyper-V with a small pool of machines (which run the Peach tree software). A few weeks ago we had a power failure in our city for a few hours over the weekend. Prior to the failure the software was working fine on Hyper-V, however following the failure our remote users get a error message saying "PAWEncrypt AcquireOurContainer Error -<Numbers>". When i use the Hyper-V console at the server i have no issues, so that one is a tad confusing.

Ive tried updating IE (which worked until i logged off then back on to the machine), We have also tried the regedits suggested on the various pages regarding this issue. I've seen a lot of this issue out there but none of the issue while in Hyper-V, I'm wondering if there's any guru's out there with a possible fix. We can always blow the pool away and recreate it but the issue there is windows Licenses. I'm trying to not throw them away if possible.

I did call sage50 which they said that this issue is generally indicating that there's a problem in windows regarding the users account on the domain(But we only have this issue remotely so i would think that the account is fine).

Also one note in case anyone else is visualizing Peach tree, Ive fixed this issue once in the past. I had to blow the pool away and recreate from a new gold image. I wouldn't suggest doing that unless your totally out of options.

We are running Hyper-V on server 2012. And as for Steady State, It has never been on any of my servers.

-Trey

server 2012 hyper-v vSwitch performance is terrible

November 19, 2012, 6:26 am

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Running an HP DL380 G5 single quad core with 8GB of ram.

OS is on RAID-1 146GB 10k rpm SAS

VM's boot from EqualLogic SAN on 24 900GB 10k rpm SAS via iSCSI at 1Gb/sec (as a test lab)

Host OS is Server 2012 with hyper-v role (all updates)

Client VM's are all server 2012

I have been running bandwidth tests between VM's on the same node and have noticed that no matter what I do I cannot get the vSwitch to push more than about 2.0Gb/sec between VM's. I am using iperf as a test to generate bandwidth.

I have tried between 2 VM's, I have tried 3 VM's pushing to 1 VM, I have tried 2 to 2, but no matter how I structure the tests the overall aggregate bandwidth between all the VM's never exceeds ~2Gb/sec over the vSwitch.

Suppoesdly the vSwitch is a virtual 10Gb/sec adapter so I'm wondering why I can only push 20% of that traffic. I'm using iperf because it doesn't require disk I/O to test bandwidth because I want to eliminate the client OS or the SAN as the bottleneck.

Can anyone provide help on getting more performance out of the vSwitch?

Migration from VMware to Hyper-V 2012

June 12, 2014, 1:49 pm

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I am looking for some advice on migrating from VMware with an existing SAN to Hyper-V 2012 on a new SAN. I have 5 ESXi 4.1 hosts hosting about 20 virtual machines on a MD3000 SAN that holds that data. I want to migrate to Hyper-V that will be utilizing a new recently purchased Dell Equalogic SAN as its storage. What would be the best way to do this? I had thought about getting the 1st Hyper-V host setup and configured with the Equalogic, running that along side the existing VMware infrastructure and then converting the vms to Hyper-V on the new storage with the standalone MVMC. Once all the vms are converted I would then re-purpose the MD3000 as additional backup storage. Would this be a workable solution. Any advice would be greatly appreciated!

 

v-switch question

June 12, 2014, 2:24 pm

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When assigning a physical nic to a v-switch is it necessary to give that nic a static IP first? For clarification I realize that DHCP will give it an IP if it needs one but what I am wondering is, does it even need one?

In a related question, I did give static IP's to nic's on a server and then assign several nic's to specific v-switches.  When I ping at least one of those static IP's I get a response.  But what I need now is to know what IP's I gave to those nics since they seem to be using them and I don't want to create a conflict. But If I look at the physical adapter properties all it shows now is "Hyper-V extensible virtual switch" which has no properties to view.  The v-switch manager has no information about what IP the associated physical adapter might be using.

This is in regards to Server 2012 R1 and R2.  The existing server where I am trying to get the IP's I used on the nics before associating them to v-switches is R1 but I am building an R2 server so I am wondering about whether or not to assign IP's to the nic's prior to associating them to v-switches on the new server.

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Failed to get the disk information

June 6, 2014, 3:21 am

≫ Next: How to boot the 2Generation VM from Network and iso

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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

How to boot the 2Generation VM from Network and iso

June 13, 2014, 5:24 am

≫ Next: Server 2012 Hyper-V replica resync fails...

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Hi

I just created one 2- Generation Hyper-v 2012 r2 VM , but how can I boot this VM from Network and iso files as legacy network Adapter is not there....

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Shailendra Dev

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!

unable to install hyper-v

June 13, 2014, 3:20 am

≫ Next: What are the host network requirements for a 2012 R2 failover cluster using fiber channel?

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hi, in vmware i have install 2008 server. After installing i try to install hyper-v but i was getting a error that "my processor is not VT-compatible or i have to enable virtualization from bios" but i already have intel i3-3220 processor and virtualization already enabled in my bios. Then why this error showing. Is it my hardware problem or anything else. Please do suggest me. Thanks 

1.my board architecture was 64bit and my server2008 also 64bit

2.my processor intel i3-3220 with 3.3ghz with vt enabled

3.my system memory 4GB RAM

Even i try to install it in physical machine but same problem. so is it hardware related issue?

What are the host network requirements for a 2012 R2 failover cluster using fiber channel?

June 12, 2014, 10:34 pm

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I've seen comments on here regarding how the heartbeat signal isn't really required anymore - is that true?  We started using Hyper-V in its infancy and have upgraded gleefully every step of the way.  With 2012 R2, we also upgraded from 1gb iSCSI to 8GB Fiber Channel.  Currently, I have three NICs in use on each host.  One for "No cluster communication" on it's own VLAN.  Another for "Allow cluster network communication on this network" but NOT allowing clients, on a different VLAN.  And lastly the public network which allows cluster comms and clients on it (public VLAN).

Is it still necessary to have all three of these NICs in use?  If the heartbeat isn't necessary any more, is there any reason to not have two public IPs and do away with the rest of the network?  (two for fault tolerance)  Does Live Migration still use Ethernet if FC is available?  I wasn't sure what all has changed with these requirements since Hyper-V first came out.

If it matters, we have 5 servers w/160GB RAM, 8 NICs, dual HBAs connected to redundant FC switches, going to two SANs.  We're running around 30 VMs right now.  

Can someone share their knowledge with me regarding the proper setup for my environment?  Many Thanks!