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JensMickerts-1131 asked jiayaozhu-MSFT commented

VHDX Size limit on Replica Server?

Hi all, I have a strange issue on a Hyper-V Replica Server. I just start with some details. We are running the following Setup: Hyper-V 2016 Cluster (3 Nodes, Production, no further details required) Hyper-V 2016 Cluster (2 Nodes, Replica target) HP Proliant DL380 G9 Servers, patched to SPP 2020.9 (latest Service Pack for Proliant) OS Windows Server 2016 Datacenter, Patched to CU 02/2021 As Cluster Storage we are using Windows Storage Spaces with some 30TB of Storage. The whole setup works fine, Replication ist quite solid, but now I have one VM where I happen to have a large VHD(X), just shy of 4TB. The Problem is that on the Replica-Server I seem to have a size limit on the Cluster Shared Volume as I am unable to resize the VHD to more than 3999999999999 Bytes. There seems to be a limit to 4000000000000. If I try resize-vhd with this value (maybe starting with 4000000000001 Bytes, I have not tried that, though). Has anybody a clue why this happens? Kind regards, Jens

windows-server-hyper-vwindows-server-clustering
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jiayaozhu-MSFT answered

Hi,

Thank you for your reply!

According to your description, you seem to be unable to expand a VHDX with an initial disk size of 4TB in the cluster after the cluster replication is completed.

I will first suggest you to confirm whether you are using static disk or dynamic disk. If you use static storage space allocation, the size of the disk space is determined at the beginning. You can only expand the disk with this type of disk when your storage space has enough unallocated disk space. If your storage space does not have enough unallocated disk space and you use static disk, then disk expansion cannot be properly performed.

To check which disk type you used, you can open Hyper-V Manager>> inspect disk, and find the target disk file and right click to view the properties of the disk.

If you have used dynamic disks, but the issue still exists, then your issue may be attributed to the shortage for your whole disk space. In this case, you can check your usage status of your cluster storage space.

Thank you for your time!

Best regards
Joann


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JensMickerts-1131 answered jiayaozhu-MSFT commented

Hi,

the initial size is below 4TB as mentioned this seems to be related to an issue with a limit of 4000000000000 Bytes, which is well below 4TB. I was able to expand the disk to one byte less than this, but no further. There is some 5TB free space on the volume, and in the VHDX there were some GBs left, but expanding to the mentioned limit worked without issues. It is a basic disk and static as well. But as mentioned I was able to expand, but not above the mentioned size.

Kind regards,

Jens

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Hi,

Thank you for your reply!

According to your descriptions, I'd like to suggest you to firstly check if there is any related error codes and messages in your event logs?

You can see in your Event Viewer:Event Viewer>> Application and Services Logs >>Microsoft >>Windows >>Hyper-V-VMMS, and click on Storage.

You can snapshot your error codes and messages if you can find them and post them to us, to see if we can further help you scope with your issue.

Thank you for your time!

Best regards
joann


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JensMickerts-1131 answered jiayaozhu-MSFT commented

Hi Joann,

sorry, but this log does not show an entry newer than last year and I tried the day I posted this issue.

I hope you still have some ideas left. I have to thank you for YOUR time, I am just trying to get rid of an issue, you are the one helping.

Kind regards,
Jens

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Hi,

Thank you for your reply!

Based on your descriptions, I guess there may be some limitations on your configurations. So, in order to better investigate your issue, I may suggest you to seek direct help from our Support Engineer through Microsoft Customer Support Services. You can contact Microsoft Product Support directly to discuss additional support options you may have available, by contacting us via the website below:

https://support.microsoft.com/en-us/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2

Once you choose to use our service, we will assign a Support Engineer specifically for you, and he or she will call you to discuss your issue in detail.

Thank you for your support and understanding! Besides, can you accept answer so that the others who have the similar issue can find out solutions more quickly.

Best regards
Joann

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