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Systemadministration
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Hyper-V copying slows down I/O Performance

Hi experts,

today we exerienced a problem while copying an expted VM from one Hyper-V to the other.
From the destination server I started copying the 30GB export via administrative share \\servername\c$ to the local SSD storage C:
After a while the destination hyper-v server stopped responding an dthe VM which already ran from C: also stopped responding.
This happened due to very bad I/O Performance.
Because of that it not seems to be possible to copy any files to a hyper-v storage without influencing the other VMs on that host.
Is there a tweak that makes copying possible?
What is the recommended way to copy a VM to a hyper-v server across the network? The same server ran ESXi before and there we never experienced such problems.

Thanks for your replies.

Best regards
Roland
VirtualizationWindows Server 2012Hyper-V

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Last Comment
ArneLovius

8/22/2022 - Mon
ArneLovius

Well as you are copying over the network, if your network hardware has the ability to QoS the traffic, you could restrict it there...

A disk only has a certain amount of IO, if you use IO with one process, it will affect all other processes that use the same disk...
kevinhsieh

There are several hotfixes available for Windows 2012 and Hyper-V

http://support.microsoft.com/kb/2784261

In particular, I would look at this one.

Improves clustered server performance and reliability in Hyper-V and Scale-Out File Server scenarios. Improves SMB service and client reliability under certain stress conditions. Install update 2770917 by using Windows Update in order to receive the cumulative update as described in KB 2770917.
http://support.microsoft.com/kb/2770917
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ArneLovius

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