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Drive performance with hyper-v cluster

January 9, 2019, 5:53 am
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I have a Dell VRTX which contains 4 server blades each running Server 2016 and internal shared storage which is made available via cluster shared volumes.

The server has a mix of drives as its been upgraded over time:-

4 x 600GB 10k SAS in RAID 10

5 x 600GB 10k SAS in RAID 5

9 x 900GB 10k SAS in RAID 5

4 x 1TB 7.2k SAS in RAID 5

I have run some disk performance tests using ATTO Disk Benchmark from within various VM's (Some Server 2012 R2 and some 2016). Some VM's are on different drive arrays (CSV's)

I am getting pretty consistent results from different VM's on the same arrays, so I'm comfortable the results are correct.

I still have some older Server 2012 R2 VM's which give averages of 900MB/s write and 1.7GB/s read on the RAID 10 array. These would have been Gen 1 original VM's.

I have one Server 2016 VM which was in-place upgraded from 2012 R2, still original IDE controller as first boot drive. This shows speeds of 1.1GB/s write and 2.46GB/s read.

I then created a brand new Server 2016 VM in the cluster, storing it's VHDX also on the RAID 10 array. This had SCSI as the boot drive type and gave averages of 3.2GB/s write and 3.33GB/s read.

I found these results interesting as it implied that server 2016 was faster on the same hardware, but also that the upgraded server was not as quick as a new one. Could this be as a result of fragmentation, deduplication, or the upgrade process?

So I then created some new small (only 20-30GB in size) VHDX files for both these VM's, creating one on each of the drive arrays to test with.

With the upgraded 2016 server I was now seeing speeds of 5.75GB/s write and the same for read. Similar speeds were encountered with the brand new Server 2016 VHDX's.

I also tried a new VM running Server 2019 and saw similar speeds (So some consistency here)

So it appears that my old Server 2012 R2 VM's and the upgraded 2016 VM are experiencing much slower disk throughput than either a new Server 2016 VM or a new VHDX assigned to them.

Any thoughts as to the reasons? Disk fragmentation over time, dedplication or something else?

My plan is to run the in place upgrade on the remaining Server 2012 R2 servers to make them 2016, however I would like to fix this performance problem as part of this, to ensure they are all running as fast as they can be.

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Drive selection for expanding Hyper-V cluster (Speed vs HDD vs SSD)

January 9, 2019, 5:59 am
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I'm just spec'ing up an additional Dell MD1200 drive shelf for my VRTX to add additional storage capacity.

Drives in this shelf will contain VHDX files for my VM's that run on the hyper-v cluster.

I will have 12 new bays to choose drives for.

Based on performance and recognising that this chassis only support 6G speed, what drive speeds should I be looking for?

With 12 slots I could go for 12 x 2Tb drives in RAID 10 for example or 8 HDD and 4 SSD. There is also a choice of 7.2k and 10k drives.

The way I have my File Server VM's configured I have a separate VHDX for the C: Operating System and another for the D: data.

In the past I have placed the C: VHDX on faster storage, is this worthwhile?

I have run some speed tests on my existing drive arrays and cannot see any discernible difference in performance between the drive and RAID types.

Thanks in advance for ideas and suggestions.

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LUN Size

January 9, 2019, 7:28 am
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What size LUNs do you guys request from your storage team? When I worked with VMware I would request 5 to 10 TB LUNs. I obviously don't want one massive LUN and I don't was tons of small 1 TB LUNs so what's your sweet spot?

Thanks

 
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Hyper-V / Server 2016 host is crashing when VMs start for first time

January 9, 2019, 11:01 am
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Like the title says, We are having an issue with our hyper-v host servers crashing on the initial startup of guest vm's. 

Everything works fine during the creation of the guest vm, then when we go to power up the guest vm about 10-20 seconds later the host crashes. Doesn't happen on every vm setup, but quite a few (say 1/3). 

I have found examples of others having the same issue or similar. See https://www.youtube.com/watch?v=ytP-RfhdBWY  (not my video, but same sort of issue).

I haven't seen anything in event viewer that would indicate a problem with the host. no crash logs are saved when it does crash, just a hard black screen (no BSOD). 

Any thing you guys can point me to look for here? I am at a total loss on this. 

Thanks,

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How to customize the Hard Disk size while creating an Ubuntu VM using Quick Create

January 9, 2019, 6:46 pm
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Team,

I am trying to create an ubuntu VM using the quick create option and I would like to have the Hard Disk to be 80 Gig instead of the default. Also I would like to customize that at create time. How could I do that?

Thanks and Cheers,

Sreeram

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Network interfaces for Hyper-V - 2x40G or 4x10G

January 9, 2019, 8:34 pm
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Dear Experts !

I am getting ready to build a 10 node Hyper-V cluster with Windows Server 2016. Its going to be on blade and each blade server has 2x40GB Interface for network and 2x10G interface for storage traffic (iscsi). But an alternate option OEM suggested is to go with 4x10G for network and 2x10G for storage.

If I choose 2x40G, Since I have only 2 physical interfaces on the server, which are getting connected through two different Top of the Rack switches - Need teaming to achieve availability. 

On top of the teamed virtual interface - Need to build virtual interface for Management, Hyper-V Data traffic and Live-migration with specific VLANs.

Is this approach good? Is there a way to limit bandwidth on the virtual interface? 

Or the traditional segregation of physical network interfaces is still the right approach?

Appreciate if you can provide any documentation/guidance/suggestions on this.

Cheers !

Shaba

Optimism is the faith that leads to achievement. Nothing can be done without hope and confidence.


InsideVirtualization.com

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Connect... does not work. Windows 10 Pro Hyper-V new install.

January 10, 2019, 8:16 am
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I'm just trying Hyper-V. I have a system that is perfectly capable of running VM's. I was able to create a VM and it was running. After I shutdown and disconnected I can no longer connect after starting the system. Clicking connect does nothing. It just starts a process that sits.

Anyone else with this issue?

David Jenkins

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RAM and Processors

January 10, 2019, 9:39 am
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Hello,

I'm running Win 2019 SRV with HyperV and two (2) VMs.

My main server has 8 cores and 64GB RAM and it running on RAID6 10k SATA drives.

I setup the VMs as one processor and dynamic RAM from 1GB to 10GB.

One VM is running the Kaspersky Management Console only.

The other is running as a RDP Server.

These are the only functionalities these two VMs run.

When I login into the host, the login is really fast. When I login into the VMs, the login takes more time.

Should I change something here to make the VMs faster to login and perform faster?

Thank you. Karel Grulich, MCSE, SBS


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Error 41 Kernel Power

January 10, 2019, 10:05 am
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Hello, I'm running Win 2019 Server with two VM machines one HyperV. When I reboot the virtual machinesfrom within Windows I then receive and error message in Even Viewer: Error 41 Kernel Power. This happens on both VMs but not on the actual main server. Any thought why and how to fix this?

Thank you. Karel Grulich, MCSE, SBS

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VM Losing Access to physical drives while running

January 11, 2019, 3:24 am
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I have a hyper-v based vm that I use as a media server. It is connected to 5 physical hard drives that it serves data from. After it is left running for some time the OS on the VM (Ubuntu server 18.04.1 LTS) starts giving IO Errors on all the drives. When I check in hyper-v settings all of the physical hard drives show up as drive not found. shutting down the vm and re-selecting each of the drives from the drop down fixes the problem temporarily. This has been happening with increased frequency with the VM sometimes lasting less than a few hours before the problem arises.
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Very slow Hyper-V Snapshot merge?

January 11, 2019, 8:22 am
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I use latest Veeam Backup and Replication to create replication task between my 2 Hyper-V Host, the first Host is production (live) and second host is a failover replica (offline). Actually Veeam is only "scripting" the built-in feature out of my Windows Server 2012 R2 Hyper-V to create backup and snapshots between my two hosts. Everything is working fine except for one thing.

When Veeam launch the task to merge the oldest VM snapshot (I keep 3x snapshots) on the Replica Host, the "merging" process is taking A WHILE to complete. I NEVER FAIL, but it take A WHILE, like 2+ hours!

I can't identify why the "merge" is taking so long. My replica Hyper-V Host is a VERY high performance HP Proliant Server, with a lot of RAM, lot of CPU, lot of everything. The storage for the server is a very fast QNAP Entreprise NAS, connected to the server using iSCSI. If I run read and write benchmark to my QNAP NAS, it's very fast. Since the NAS is connected with Gigabit ethernet for the moment (don't have 10 Gbps on my switches, but the QNAP have 10 Gpbs), I have a super stable 110 MB/s in both read and write, which is so far, excellent!

The "affected" VM of the slow merge is my main file server VM, who have obviously large VHDX volumes. The main VHDX volume is 6.5 TB but snapshots are only around 100-125 GB but the "merging" process is taking more or less 2 HOURS to complete. The VHDX volume are pre-allocated if this matters (as in the best practice in Hyper-V for production drive).

BY THE WAY, I already opened a service ticket with Veeam and they have answered that the Hyper-V snapshot merging is a Microsoft feature that is only initiated by Veeam, so that they can't determine why the process is taking so long because it's on the Hyper-V Host side.

So if my storage and my server is fast, why did it take that long to merge the Hyper-V Snapshot???


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Hyper-v Storage Spaces Direct cluster node servers running other software like Docker Swarm

January 11, 2019, 9:14 am
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Hello,

I am running Hyper-V in a Storage Spaces Direct cluster with 4 nodes, being managed by System Center VMM.  I am running multiple VM's both windows and Linux on top of this cluster.

Question is, if its supported and/or recommended by Microsoft to also run other software on the cluster servers directly, when this cluster is being used for Hyper-V.  In particular the question is to run a Docker Swarm setup on this same cluster, directly on the node servers.  I do realize I can run VM Linux machines and run Docker on-top of the VM's, but that is not the question.

Thank you for any response.

Robert

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Hyper V manager missing VM after SAN volume move

January 8, 2019, 2:06 am
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Hi,

Have a 2012r2 Hyper V cluster and 2 Nimble SAN array.

What i did:

1. Shutdown VM
2. Offline the CSV volume
3. Did a Nimble handover of the volume belong to the VM. Worked fine.
4. Attached the iSCSI drive again from Nimble NCM manager on all Hyper V servers
5. Verified i can see the volume and files and the volume has the same volume number in CSV
6. VM machine showed up fine in Failover CLuster manager
7. VM machine is now missing in Hyper V Manager
8. Had to import the VM machine config files and vDisk
9. VM machine boot up fine.

Question: Why are the VM missing from Hyper V manager when the CSV has been offline?

Regards
Robert

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Create a Linux VM

January 12, 2019, 5:50 am
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Hi,

Is it possible to create or import a Linux VM into windows 2008 r2 Hyper-V server?

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Slowness on hyper-v host

January 12, 2019, 5:56 am
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HI All.

On some Hyper-V nodes, we have observed significant performance slowness compared to other nodes running in the same cluster. The performance is most noticeable . we mo moved the VMs the reside on this host to another host it works fine and fast

any help plz 

IT Helpdesk

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Cannot start X on freebsd; issues a Bus error

January 12, 2019, 8:43 am
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I installed a clean version of FreeBSD 11.4 and installed the binaries for xorg and configured xorg.conf to use: Driver "vesa". When I use "startx" the X process issues a Bus error w/ the Backtrace eventually going to:

...

/usr/local/bin/X (OsInit+0x37a) [0x5aa90a]

....

Can someone provide the proper configuration or information for hyper-v and freebsd to start the X window system.

Thanks


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Windows Server 2012 - Network Category

January 12, 2019, 2:58 pm
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After a recent patch and reboot, one of my two physical Hyper-V servers (identical hardware and should be identical configuration) swapped its network connection from a Private network to the Domain network.

This has also caused RDP to stop working from inside the network and a backup service to lose connectivity to other network (non-domain) devices. I haven't rebooted the server (Private network category) yet but I assume once I do it'll alter itself to the domain network. In the past, I've had a problem where the network connection switched to Public from Private (which was easy enough to fix) but never to the Domain.

My first attempt to resolve the problem was what I had done previously, which was set the network connection to Private, but since it was Domain I received:

Set-NetConnectionProfile : Unable to set the NetworkCategory due to one of the following possible reasons: not running
PowerShell elevated; the NetworkCategory cannot be changed from 'DomainAuthenticated'; user initiated changes to Networ
kCategory are being prevented due to the Group Policy setting 'Network List Manager Policies'.

My first Hyper-V server hosts the domain controller, the second Hyper-V server (the one with problems) hosts the secondary domain controller.

I'd like to identify two things:

1. Why one of the two servers (or perhaps both after I reboot the first one) suddenly switched to a Domain network connection from Private and how in general I can prevent problems with this (whether it is going from Private to Public or Private to Domain) after patches/reboots.

2. Why I cannot RDP or my backup service to work on the Domain network connection when the firewall rules should permit it. I've confirmed the server is running the Domain firewall profile and that the inbound rules open up the appropriate ports, but when I do attempt to connect to port 3389 from elsewhere on the network the port seems closed/blocked. The first server (Private network category) passes the TCP connection test to 3389.

Network connections view of both servers. "Network 2" is private, the "FQDN" network is the domain.

Any help is appreciated, thanks.


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Replace Virtual Fibre Channel with VHDX

January 13, 2019, 12:06 pm
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Greetings Experts,

We have a hypervisor v2012-R2 hosting one production/critical VM (Guest OS Red Hat Linux 6.7)

This VM contain OS on VHDX file and another Virtual Fibre Channel LUN directly attached to the VM. 

**Problem related to the backup solution and as per the backup engineer he would like to (replace or convert or migrate) this LUN with VHDX file to be installed same as the OS Disk to be able to take the backup.

I know i cannot use Hyper-v replica (and the only way for replication is using array replica from the storage manager it self)

But is their alternatives or another options i am missing to achieve this?

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Recover VHDX - Cannot mount

January 13, 2019, 8:18 pm
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Hello,<o:p></o:p>

We had experienced a virtual machine crash, and the virtual machine could no longer boot.<o:p></o:p>

Host:  Windows Server 2012 (Hyper-V host)<o:p></o:p>

Guest VM:  Windows Server 2012<o:p></o:p>

I then made a copy of the virtual machine and configuration to attempt recovery from a Windows Server 2016 for recovery.<o:p></o:p>

I tried to use the Inspect Disk function on the .AVHDX file, which then it asks to Inspect Parent disk.  Once I try to inspect the parent disk, the same error occurs where it says the parent .VHDX is corrupt.<o:p></o:p>

“An error occurred when attempting to retrieve the virtual hard disk<o:p></o:p>

…\VM_Disk_0_HD_E6701573-EB9F-413… on server UNIREC.<o:p></o:p>

Failed to get the disk information.<o:p></o:p>

An unexpected error occurred: The file or directory is corrupted and unreadable. (0x80070570).<o:p></o:p>

Failed to get the disk information.<o:p></o:p>

The Hyper-V Virtual Machine Management service encountered an unexpected error: The file or directory is corrupted and unreadable. (0x80070570).”<o:p></o:p>

<o:p> </o:p>

EventID 27000 is logged in the Hyper-V VMMS storage log with the following error:<o:p></o:p>

Failed to open attachment 'E:\Hyper-V\virtualboot\VM_Disk_0_HD_E6701573-EB9F-4131-AC77-89C05EC878AC.vhdx'. Error: 'The file or directory is corrupted and unreadable.'.<o:p></o:p>

Any help would be appreciated!

Thanks!

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Licensing Windows 2016 VM under Windows Server 2012 R2 Hyper-V

January 13, 2019, 9:50 pm
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We have a Hyper-V cluster running with Windows Server 2012 R2 which is currently licensed with Server 2012 R2 Datacenter Edition. 

As per current requirement, we are planning to build Windows 2016 VM under Server 2012 R2 Hyper-V cluster which is fully supported as guest OS. 

Would like to know, if there will be any licensing constraint of deploying a Windows 2016 VM under Server 2012 R2 Hyper-V cluster? If yes, how can it be mitigated?

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