Hyper-V 2012 R2 VMQ live migrate (shared nothing) Blue Screen

Hello,
Have Windows Server 2012 R2 Hyper-V server, fully patched, new install. There are two intel Network cards ant there is configured NIC team of them (Windows NIC teaming). Also there is some "Virtual" NICS with assigned VLAN ID.
If I enable VMQ on these NICS and do shared nothing live migration of VM - host gets BSDO. What can be wrong?

Hi,
I would like to check if you need further assistance.
Thanks.
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Similar Messages

Windows 2012 R2 - Remote Desktop Sessions, RemoteFX, GPU, Blue Screen RemoteFX adaptor

Nvidia GPU GRID K1
Host Server - Dell Power edge R720 128 gig RAM 2 Xeon E5-2640v2 2.0GHz, 20M cache 8c
Windows 2012 R2 full installation – Bios and all hardware with latest updates.
Roles - Hyper V and Remote Desktop Virtualization Host
EPT, GPU, WDDM (latest drivers) compatible for RemoteFX and fully up to date.
I have disabled the video adaptor on the motherboard.
I cannot complete with administrative permissions;
dism /online /enable-feature /featurename:Microsoft-Windows-RemoteFX-EmbeddedVideoCap-Setup-Package
Error: 0x800f080c
Feature name Microsoft-Windows-RemoteFX-EmbeddedVidoCap-Setup-Package is unknown
Question 1 - because video card on motherboard disabled, do I still need to complete this command?
VM’s
**I’m not interested in VDI but more Remote Desktop Sessions and the option to ‘pinch and zoom with Windows 8.1 tablets**
VM1 - Windows 2012 R2 configured as generation 1 that is fully patched.
This VM is able to start up and run until I add the new hardware for the RemoteFX Video adaptor from within the Hyper V settings. When I start the VM the server blue screens. I have tried multiple VM’s with 2012 but same thing
If I created the VM as Generation 2 I am able to start the VM but the RemoteFX adaptor doesn’t appear in the device manager. I have read generation 2 isn’t compatible with RemoteFX.
VM2 – *Testing purposes* - Windows 8.1 Enterprise configured as generation 1 that is fully patched.
This VM I am able to start up and run the VDI after the RemoteFX video adaptor is installed, also the correct adaptor appears in the device manager. This seems to at least work correctly but I cannot pinch and zoom and the experience is poor.
GPU summary within the Hyper V settings state there are 4 physical GPU’s all of which can be used with RemoteFX and that 1 virtual machine are using the GPU (Windows 8.1 enterprise VM)
Firewalls off, latest RDP clients
I have read you should be able to use Windows 2012 R2 and we should be able to use the sessions with pinch and zoom but now and then you come across something that tells me different.
Question 2 – I need this to work with Windows 2012 R2 so we can use Remote Desktop Sessions
and the tablets can use pinch and zoom, anyone tell me what I may be doing wrong?

Hi,
Thank you for posting in Windows Server Forum.
As per my research, you need to run the command although video adapter is disabled on motherboard. If you install the RemoteFX cap driver, the integrated video adapter is disabled while the operating system is running.
For more information you can refer beneath article.
1. RemoteFX (with Hyper-V) is a serious business tool. For games.
2. Configure RemoteFX in Hyper-V running Windows Server 2012 with low end GPU
Hope it helps!
Thanks.
Dharmesh Solanki

Copying files in Home Sharing causes blue screen of death

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I have an issue when I copy music from Vista 64bit iTunes 9 to WinXP Pro (32 bit) iTunes 9 via Home Sharing my XP machine blue screens. This makes sharing rather useless and causes data loss on my system. The issue can be reproduced.

Hyper-V host crash and live migration - what happens?

Hello there,
it would be great if you could help me understand how live migrationworks on a sudden host crash of a cluster node.
I know that the cluster functionality mounts the vhd file on another host and runs the VM.
But what happens to the VM itself? Does it crash too and is simply restarted on another host?
To my knowledge the RAM of the VM is run in the RAM of the host, wo I would assume that is all lost on a host crash?
Thanks for any help understanding this,
Best regards, Marcus

In a sudden crash, there is no time for the state of any running VMs to move to another system. Therefore, the VM is restarted on another node of the cluster. Think of the host crashing as being the same as pulling the power cable on the VM.
. : | : . : | : . tim

Shared nothing live migration over SMB. Poor performance

Hi,
I´m experiencing really poor performance when migrating VMs between newly installed server 2012 R2 Hyper-V hosts.
Hardware:
Dell M620 blades
256Gb RAM
2*8C Intel E5-2680 CPUs
Samsung 840 Pro 512Gb SSD running in Raid1
6* Intel X520 10G NICs connected to Force10 MXL enclosure switches
The NICs are using the latest drivers from Intel (18.7) and firmware version 14.5.9
The OS installation is pretty clean. Its Windows Server 2012 R2 + Dell OMSA + Dell HIT 4.6
I have removed the NIC teams and vmSwitch/vNICs to simplify the problem solving process. Now there is one nic configured with one IP. RSS is enabled, no VMQ.
The graphs are from 4 tests.
Test 1 and 2 are nttcp-tests to establish that the network is working as expected.
Test 3 is a shared nothing live migration of a live VM over SMB
Test 4 is a storage migration of the same VM when shut down. The VMs is transferred using BITS over http.
It´s obvious that the network and NICs can push a lot of data. Test 2 had a throughput of 1130MB/s (9Gb/s) using 4 threads. The disks can handle a lot more than 74MB/s, proven by test 4.
While the graph above doesn´t show the cpu load, I have verified that no cpu core was even close to running at 100% during test 3 and 4.
Any ideas?
Test
Config
Vmswitch
RSS
VMQ
Live Migration Config
Throughput (MB/s)
NTtcp
NTttcp.exe -r -m 1,*,172.17.20.45 -t 30
No
Yes
No
N/A
500
NTtcp
NTttcp.exe -r -m 4,*,172.17.20.45 -t 30
No
Yes
No
N/A
1130
Shared nothing live migration
Online VM, 8GB disk, 2GB RAM. Migrated from host 1 -> host2
No
Yes
No
Kerberos, Use SMB, any available net
74
Storage migration
Offline VM, 8Gb disk. Migrated from host 1 -> host2
No
Yes
No
Unencrypted BITS transfer
350

Hi Per Kjellkvist,
Please try to change the "advanced features"settings of "live migrations" in "Hyper-v settings" , select "Compression" in "performance options" area .
Then test 3 and 4 .
Best Regards
Elton Ji
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

Server 2012 R2 Hyper-V Cluster, VM blue screens after migration between nodes.

I currently have a two node Server 2012 R2 Hyper-v Cluster (fully patched) with a Windows Server 2012 R2 Iscsi target.
The VMs run fine all day long, but when I try to do a live/quick migration the VM blue screens after about 20 minutes. The blue reports back about a “Critical_Structure_Corruption”.
I’m being to think it might be down to CPU, as one system has an E-2640v2 and the other one has an E5-2670v3. Should I be able to migrate between these two systems with these type of CPU?
Tim

Sorry Tim, is that all 50 blue screen if live migrated?
Are they all on the latest integration services? Does a cluster validation complete successfully? Are the hosts patched to the same level?
The fact that if you power them off then migrate them and they boot fine, does point to a processor incompatibility and the memory BIN file is not accepted on the new host.
Bit of a long shot but the only other thing I can think of off the top of my head if the compatibility option is checked, is checking the location of the BIN file when the VM is running to make sure its in the same place as the VHD\VHDX in the
CSV storage where the VM is located and not on the local host somewhere like C:\program data\.... that is stopping it being migrated to the new host when the VM is live migrated.
Kind Regards
Michael Coutanche
Blog:
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Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

Recently whenever i plug my ipod nano to my pc the pc shuts down to a blue screen then a black screen then windows error message i have the latest version of itunes and software i just got this dec 2012

as of today when i plug my 7th generation ipod that i just got for christmas 2012 my pc shuts down to a blue screen with alot of writing then to black screen with alot of writing then to an all black screen then and windows error message my computer is ingood condition no malicious malware and has been clean i need help
thank ycj

let me get back with the answer with what the messages say on the blue screen and the black screen if i can read them fast enough before it shuts down i have windows 7 professional

Hyper-v 2012 r2 slow throughputs on network / live migrations

Hi, maybe someone can point me in the right direction, I have 10 servers 5 Dell r210s and 5 Dell R320's, I have basically converted these servers to standalone hyper-v 2012 servers, so there is no clustering on any at the moment.
Each server is configured with 2 1Gb nics teamed via a virtual switch, now when I copt files between server 1 and 2 for example I see 100MBs throughput, but if I copy a file to server 3 at the same time the file copy load splits the 100MBs throughput between
the 2 copy processes. I was under the impression if I copied 2 files to 2 totally different servers the load would basically be split across the 2 nics effectively giving me 2Gbs throughput but this does not seem to be the case. I have played around with tcpip
large send offloads, jumbo packets, disabled vmq on the cards, they are broadcoms. :-( but it doesn't really seem to make a difference with all of these settings.
The other issue is If I live migrate a 12Gb vm machine running only 2gb ram, effectively just an o/s it takes between 15 to 20 minutes to migrate, I have played around with the advanced settings, smb, compression, tcpip not real game changers, BUT if I shut
town the vm and migrate it, it takes, just under 3 and a half minutes to move across.
I am really stumped here, I am busy in a test phase of hyper-v but cant find any definitive documents relating to this stuff.

Hi Mark,
The servers (hyper-v 2012 r2) are all basically configured with ssvmm2012R2 where they all have teamed 1Gb pNics, into a virtual switch, then there are vNics for the Vmcloud, live migration etc. The physical network is 2 Netgear Gs724T switches which
are interlinked and each servers 1st nic is plugged into the switch1 and the second nic is plugged into the switch2.See Below Image) The hyper-v port is set to independent Hyper-v load balancing.
The R320 servers are running raid 5 sas drives, the R210s have 1Tb drives mirrored. The servers all are using DAS storage, we have not moved to looking at using iscsi and san is out the question at the moment.
I am currently testing between 2x 320s and 2x R210s, I am not copying data to the vm's yets, I am basically testing the transfer between the actual hosts at the moment by copying a 4Gb file manually, After testing the live migrations I decided to test to
see the transfer rates between the servers first, I have been playing around with the offload settings and rss, what I don't understand is yesterday, the copy between the servers was running up to 228Mbs ie (using both nics) when copying
the file between the servers, and then a few hours later it only was copying at 50/60Mbs, but its now back at 113Mbs seemingly to be only using one nic.
I was under the impression if you copy a file between 2 servers the nicks could use the 2gb bandwidth, but after reading many posts they say only one nic, so how did the copies get up to 2Gb yesterday. Then again if you copy files between 3 servers, then
each copy would use one nic, basically giving you 2Gbs, but this is again not being seen.
Regards Keith

LIve migration trigger on Resource crunch in Hyper-v 2012 or R2

Like VMware DRS , who can trigger Migration of virtual machine from 1 datastore to another or 1 host to another. do we have same kind of machanism in Hyper-v 2012 also.
i have five HYper-v 2012 host in single cluster. now i want if any host face resource crucnh of memory than it migrate the virtual machine on another host.
Thanks ravinder
Ravi

SCVMM has a feature called Dynamic Optimization.
Dynamic Optimization can be configured on a host group, to migrate virtual machines within host clusters with a specified frequency and aggressiveness. Aggressiveness determines the amount of load imbalance that is required to initiate a migration during
Dynamic Optimization. By default, virtual machines are migrated every 10 minutes with medium aggressiveness. When configuring frequency and aggressiveness for Dynamic Optimization, an administrator should factor in the resource cost of additional migrations
against the advantages of balancing load among hosts in a host cluster. By default, a host group inherits Dynamic Optimization settings from its parent host group.
Dynamic Optimization can be set up for clusters with two or more nodes. If a host group contains stand-alone hosts or host clusters that do not support live migration, Dynamic Optimization is not performed on those hosts. Any hosts that are in maintenance
mode also are excluded from Dynamic Optimization. In addition, VMM only migrates highly available virtual machines that use shared storage. If a host cluster contains virtual machines that are not highly available, those virtual machines are not migrated during
Dynamic Optimization.
http://technet.microsoft.com/en-us/library/gg675109.aspx
Cheers !
Optimism is the faith that leads to achievement. Nothing can be done without hope and confidence.
InsideVirtualization.com

Win 2012 shared-nothing live migration slow performance

Win 2012 shared-nothing live migration slow performance
Hello,
i have two standalone hyper-v servers - A) 2012 and B) 2012 r2.
I tried live migration on non-shared storage between them. The functionality is alright but performance is low. The copying take a long time with max 200 Mbps.
I am not able to find the bottleneck. Network a disk performance seems to be good. It is 1Gbps network and when I tried simple copy paste the vhd file from A to B through cifs protocol, the speed was about almost full 1Gbps - it was nice and fast.
Is it feature? I am not able reach full network performance with shared-nothing live migration.
Thank you for reply
sincerely
Peter Weiss

Hi,
I don’t found the similar issue with Hyper-V, Does both of your hosts have the chipsets in the same family? Could you try to switch the three Live Migration Performance
Option method then monitor again? Or It seems there may have some disk or file system performance issue, please try to update your RAID card firmware to the least version.
More information:
Shared Nothing Live Migration: Goodbye Shared Storage?
http://blogs.technet.com/b/canitpro/archive/2013/01/03/shared-nothing-live-migration-goodbye-shared-storage.aspx
How to: Copy very large files across a slow or unreliable network
http://blogs.msdn.com/b/granth/archive/2010/05/10/how-to-copy-very-large-files-across-a-slow-or-unreliable-network.aspx
The similar thread:
How to determine when to use the xcopy with the /j parameter?
http://social.technet.microsoft.com/Forums/en-US/5ebfc25a-41c8-4d82-a2a6-d0f15d298e90/how-to-determine-when-to-use-the-xcopy-with-the-j-parameter?forum=winserverfiles
Hope this helps

Live Migration Fails with error Synthetic FiberChannel Port: Failed to finish reserving resources on an VM using Windows Server 2012 R2 Hyper-V

Hi, I'm currently experiencing a problem with some VMs in a Hyper-V 2012 R2 failover cluster using Fiber Channel adapters with Virtual SAN configured on the hyper-v hosts.
I have read several articles about this issues like this ones:
https://social.technet.microsoft.com/Forums/windowsserver/en-US/baca348d-fb57-4d8f-978b-f1e7282f89a1/synthetic-fibrechannel-port-failed-to-start-reserving-resources-with-error-insufficient-system?forum=winserverhyperv
http://social.technet.microsoft.com/wiki/contents/articles/18698.hyper-v-virtual-fibre-channel-troubleshooting-guide.aspx
But haven't been able to fix my issue.
The Virtual SAN is configured on every hyper-v host node in the cluster. And every VM has 2 fiber channel adapters configured.
All the World Wide Names are configured both on the FC Switch as well as the FC SAN.
All the drivers for the FC Adapter in the Hyper-V Hosts have been updated to their latest versions.
The strange thing is that the issue is not affecting all of the VMs, some of the VMs with FC adapters configured are live migrating just fine, others are getting this error.
Quick migration works without problems.
We even tried removing and creating new FC Adapters on a VM with problems, we had to configure the switch and SAN with the new WWN names and all, but ended up having the same problem.
At first we thought is was related to the hosts, but since some VMs do work live migrating with FC adapters we tried migrating them on every host, everything worked well.
My guess is that it has to be something related to the VMs itself but I haven't been able to figure out what is it.
Any ideas on how to solve this is deeply appreciated.
Thank you!
Eduardo Rojas

Hi Eduardo,
How are things going ?
Best Regards
Elton Ji
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

Hyper-V replica vs Shared Nothing Live Migration

Shared Nothing Live Migration allows to transport your VM over the WAN without shutting it down (how much time it takes on io intensive vm is another story)
  Hyper-V replica does not allow to perform the DR switch without shutdown operation on primary site VM !
why can't it take the VM live to the DR ?
that's because if we use Shared Nothing across the WAN, we don't use the data that Hyper-V replica can and then it also breaks everything hyper-V replica does.
Point is: how to take the VM to DR in running state, what is the best way to do that ?
Shahid Roofi

Hi Shahid,
Hyper-V Replica is designed as a DR technology, not as a technique to move VMs. It assumes that should you require it, the source VM would probably be offline and therefore you would be powering up the passive copy from a previous point in time
as its not a true synchronous replica copy. It does give you the added benefit to be able to run a planned failover which as you say, powers of the VM first, runs a final Sync then powers the new VM up. Obviously you cant have the duplicate copy of this VM
running all the time at the remote site, otherwise you would have a split brain situation for network traffic.
Like the live migration the shared nothing live migration is a technology aimed at moving a VM, but as you know offers the ability to do this without having shared storage and only requires a network connection. When initiated moves the whole
VM, well copies the virtual drive and memory before sending machine writes to both, then only to the new VM when they both match. With regards to the speed, I assume you have the SNLM setup to compress data before sending across the wire?
If you want a true live migration between remote sites, one way would be to have a SAN array between both sites synchronously replicating data, then stretch the Hyper-V cluster across both sites. Obviously this is a very expensive solution but perhaps
the perfect scenario.
Kind Regards
Michael Coutanche
Blog:
Twitter:   LinkedIn:
Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

Hyper-V guest SQL 2012 cluster live migration failure

I have two IBM HX5 nodes connected to IBM DS5300. Hyper-V 2012 cluster was built on blades. In HV cluster was made six virtual machines, connected to DS5300 via HV Virtual SAN. These VMs was formed a guest SQL Cluster. Databases' files are placed on
DS5300 storage and available through VM FibreChannel Adapters. IBM MPIO Module is installed on all hosts and VMs.
SQL Server instances work without problem. But! When I try to live migrate SQL VM to another HV node an SQL Instance fails. In SQL error log I see:
2013-06-19 10:39:44.07 spid1s      Error: 17053, Severity: 16, State: 1.
2013-06-19 10:39:44.07 spid1s      SQLServerLogMgr::LogWriter: Operating system error 170(The requested resource is in use.) encountered.
2013-06-19 10:39:44.07 spid1s      Write error during log flush.
2013-06-19 10:39:44.07 spid55      Error: 9001, Severity: 21, State: 4.
2013-06-19 10:39:44.07 spid55      The log for database 'Admin' is not available. Check the event log for related error messages. Resolve any errors and restart the database.
2013-06-19 10:39:44.07 spid55      Database Admin was shutdown due to error 9001 in routine 'XdesRMFull::CommitInternal'. Restart for non-snapshot databases will be attempted after all connections to the database are aborted.
2013-06-19 10:39:44.31 spid36s     Error: 17053, Severity: 16, State: 1.
2013-06-19 10:39:44.31 spid36s     fcb::close-flush: Operating system error (null) encountered.
2013-06-19 10:39:44.31 spid36s     Error: 17053, Severity: 16, State: 1.
2013-06-19 10:39:44.31 spid36s     fcb::close-flush: Operating system error (null) encountered.
2013-06-19 10:39:44.32 spid36s     Error: 17053, Severity: 16, State: 1.
2013-06-19 10:39:44.32 spid36s     fcb::close-flush: Operating system error (null) encountered.
2013-06-19 10:39:44.32 spid36s     Error: 17053, Severity: 16, State: 1.
2013-06-19 10:39:44.32 spid36s     fcb::close-flush: Operating system error (null) encountered.
2013-06-19 10:39:44.33 spid36s     Starting up database 'Admin'.
2013-06-19 10:39:44.58 spid36s     349 transactions rolled forward in database 'Admin' (6:0). This is an informational message only. No user action is required.
2013-06-19 10:39:44.58 spid36s     SQLServerLogMgr::FixupLogTail (failure): alignBuf 0x000000001A75D000, writeSize 0x400, filePos 0x156adc00
2013-06-19 10:39:44.58 spid36s     blankSize 0x3c0000, blkOffset 0x1056e, fileSeqNo 1313, totBytesWritten 0x0
2013-06-19 10:39:44.58 spid36s     fcb status 0x42, handle 0x0000000000000BC0, size 262144 pages
2013-06-19 10:39:44.58 spid36s     Error: 17053, Severity: 16, State: 1.
2013-06-19 10:39:44.58 spid36s     SQLServerLogMgr::FixupLogTail: Operating system error 170(The requested resource is in use.) encountered.
2013-06-19 10:39:44.58 spid36s     Error: 5159, Severity: 24, State: 13.
2013-06-19 10:39:44.58 spid36s     Operating system error 170(The requested resource is in use.) on file "v:\MSSQL\log\Admin\Log.ldf" during FixupLogTail.
2013-06-19 10:39:44.58 spid36s     Error: 3414, Severity: 21, State: 1.
2013-06-19 10:39:44.58 spid36s     An error occurred during recovery, preventing the database 'Admin' (6:0) from restarting. Diagnose the recovery errors and fix them, or restore from a known good backup. If errors are not corrected or expected,
contact Technical Support.
In windows system log I see a lot of warnings like this:
- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
<Provider
Name="Microsoft-Windows-Ntfs" Guid="{3FF37A1C-A68D-4D6E-8C9B-F79E8B16C482}" />
<EventID>140</EventID>
<Version>0</Version>
<Level>3</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000008</Keywords>
<TimeCreated
SystemTime="2013-06-19T06:39:44.314400200Z" />
<EventRecordID>25239</EventRecordID>
<Correlation
/>
<Execution
ProcessID="4620" ThreadID="4284" />
<Channel>System</Channel>
<Computer>sql-node-5.local.net</Computer>
<Security
UserID="S-1-5-21-796845957-515967899-725345543-17066" />
</System>
- <EventData>
<Data Name="VolumeId">\\?\Volume{752f0849-6201-48e9-8821-7db897a10305}</Data>
<Data Name="DeviceName">\Device\HarddiskVolume70</Data>
<Data Name="Error">0x80000011</Data>
</EventData>
</Event>
The system failed to flush data to the transaction log. Corruption may occur in VolumeId: \\?\Volume{752f0849-6201-48e9-8821-7db897a10305}, DeviceName: \Device\HarddiskVolume70.
({Device Busy}
The device is currently busy.)
There aren't any error or warning in HV hosts.

Hello,
I am trying to involve someone more familiar with this topic for a further look at this issue. Sometime delay might be expected from the job transferring. Your patience is greatly appreciated.
Thank you for your understanding and support.
Regards,
Fanny Liu
If you have any feedback on our support, please click
here.
Fanny Liu
TechNet Community Support

Hyper-v 2012 R2 Live migration issue in 2003 Domain function Level

hi Team ,
i recently build 2012 R2 Hyper-v Cluster with three node. Everrything working fine with out any issue . Cluster working also fine. Later i came across one issue when tried to Live migration virtual machine from one host to another . it failed all the time
while quick migration is working . i gone through few articles and find it is known issue with hyper-v 2012 R2 where domain functional level is set to 2003 . although they have provided Hotfix but no solution.
http://support.microsoft.com/kb/2838043
Please let me know if any one face similar issue and able to resolve by any hotfix. My host are updated .
Thanks
Ravindra
Ravi

Hi Ravi1987,
The KB2838043 is applied for Server 2012 node, Could you offer us the related cluster error event id, or you can refer the following article to check your cluster
network binding order is correct or not.
Configuring Windows Failover Cluster Networks
http://blogs.technet.com/b/askcore/archive/2014/02/20/configuring-windows-failover-cluster-networks.aspx
You can try to install recommended hotfixes and updates for Windows Server 2012 R2-based failover clusters first, then monitor this issue again.
The KB download:
Recommended hotfixes and updates for Windows Server 2012 R2-based failover clusters
http://support.microsoft.com/kb/2920151
More information:
Windows Server 2008 R2 Live Migration – “The devil may be in the networking details.”
http://blogs.technet.com/b/askcore/archive/2009/12/10/windows-server-2008-r2-live-migration-the-devil-may-be-in-the-networking-details.aspx
I’m glad to be of help to you!

Hyper-V 2012 R2 - live migration dynamic memory issue

Hi..
we use a two node hyper-v cluster.
On each node running 5 vm that shared the 64GB system memory.
The vms are configured to use dynamic memory. The sum of the startup (min) memory of the 10 vms are currently 50 GB.
So now our problem:
If we try to drain roles on node A for maintenance purpose two vms are still on node A because they wasted currently each 25GB memory and so on node B is not enough free memory to host this vms.
That sounds logical
But as all vms configured to use dynamic memory they should shrink their memory to get enough space for all vms? If we shutdown all vms, move it to one node, then everything works fine.
Is it by design that live migration do not trigger the vm to shrink their memory?
Best regards, Alexander Zirbes

Hi Alexander,
Dynamic memory means that memory can increase or decrease based on the demand of the VM, not based on the load of the Hyper-V host. If the gust OS of VM dont need that much memory, memory will be released. I dont think live migration has any role shrinking
the allocated memory of a VM.
Since you are using two node cluster, you should only load 50% resourses on each host so that incase of a failure of second node, the first node can have all the VMs.
This calculation will become more effective if you have more nodes. I am having a six node cluster and I load each host upto 80% so that in case of a single node failure, the VMs can be split on other five nodes without issues.
Cheers,
Shaba
Optimism is the faith that leads to achievement. Nothing can be done without hope and confidence.
InsideVirtualization.com

Hyper-V 2012 R2 VMQ live migrate (shared nothing) Blue Screen

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