<![CDATA[ECC memory not detected]]>Hello I'm running XCP-NG 8.3 Beta 2 (will update to RC1 this weekend).

I have a Windows Server 2022 environment I'm setting up A) I need Hyper-V installed, which isn't going to happened due to the limitations of Nested Virtualization (Already super frustrated about that)... B) I was able to install Hyper-V through DISM, BUT I seeing errors that Windows seems to think I don't have ECC RAM installed.

Does XCP-NG not passthrough the RAM data info so Windows sees that it is ECC RAM?

I'm very confused about that.

]]>https://xcp-ng.org/forum/topic/9453/ecc-memory-not-detectedRSS for NodeTue, 16 Jun 2026 15:25:17 GMTWed, 31 Jul 2024 19:36:41 GMT60<![CDATA[Reply to ECC memory not detected on Fri, 02 Aug 2024 19:15:07 GMT]]>@FTSSupport Got it! I'm not sure there is a way around hyper-v complaining on that front unfortunately.

]]>https://xcp-ng.org/forum/post/81198https://xcp-ng.org/forum/post/81198Fri, 02 Aug 2024 19:15:07 GMT<![CDATA[Reply to ECC memory not detected on Fri, 02 Aug 2024 19:09:12 GMT]]>@planedrop Exactly! Otherwise I didn't care because like you said, what the VM sees doesn't exactly matter in this regard because the host has ECC memory.

]]>https://xcp-ng.org/forum/post/81196https://xcp-ng.org/forum/post/81196Fri, 02 Aug 2024 19:09:12 GMT<![CDATA[Reply to ECC memory not detected on Thu, 01 Aug 2024 21:13:18 GMT]]>@FTSSupport OH gotcha, so the software needs Hyper-V, and Hyper-V was complaining about the lack of ECC?

]]>https://xcp-ng.org/forum/post/81151https://xcp-ng.org/forum/post/81151Thu, 01 Aug 2024 21:13:18 GMT<![CDATA[Reply to ECC memory not detected on Thu, 01 Aug 2024 12:58:25 GMT]]>@Andrew My point was Hyper-V was giving an error because it said that it couldn't detect ECC memory either...

]]>https://xcp-ng.org/forum/post/81128https://xcp-ng.org/forum/post/81128Thu, 01 Aug 2024 12:58:25 GMT<![CDATA[Reply to ECC memory not detected on Thu, 01 Aug 2024 04:39:31 GMT]]>@FTSSupport From what I read on that page, Project Configuration Tool requires Windows Hyper-V, not ECC memory.

Since Windows Hyper-V won't run under Xen/XCP you can't install that software.

]]>https://xcp-ng.org/forum/post/81112https://xcp-ng.org/forum/post/81112Thu, 01 Aug 2024 04:39:31 GMT<![CDATA[Reply to ECC memory not detected on Thu, 01 Aug 2024 02:40:18 GMT]]>@planedrop It looks like it is actually required for this piece of software to run at all... I might call them to see if they have worked with others that virtualize their servers to run the software or if they always run them on bare metal Windows... I don't use the software, so I don't know much about it, I just make sure the machines are available to run it.

https://ecostruxure-building-help.se.com/bms/Topics/show.castle?id=12297&locale=en-US&productversion=3.2#section__technicaldata

]]>https://xcp-ng.org/forum/post/81103https://xcp-ng.org/forum/post/81103Thu, 01 Aug 2024 02:40:18 GMT<![CDATA[Reply to ECC memory not detected on Thu, 01 Aug 2024 00:02:51 GMT]]>There isn't a need for the VMs to be aware of it being ECC memory, that's something for the host to deal with, so it won't make a difference in Windows.

What is your purpose/requirement for Hyper-V? Nested virtualization is almost always unreliable, this isn't a XCP-ng or Xen thing, it's also buggy/unstable in ProxMox, other KVM hypervisors, etc... The only time I've had this work is nesting Hyper-V inside a VM that is already running on Hyper-V, but even that is something Microsoft says don't do.

]]>https://xcp-ng.org/forum/post/81100https://xcp-ng.org/forum/post/81100Thu, 01 Aug 2024 00:02:51 GMT<![CDATA[Reply to ECC memory not detected on Wed, 31 Jul 2024 21:02:57 GMT]]>@FTSSupport Kind of... ECC system memory is reported to the guest, but then it also reports 64bit (non-ECC) memory. So if windows looks at the memory width then it shows as non-ECC. If windows looks at the system memory type then it reports ECC memory.

It does not matter as your host server deals with ECC memory and any errors.

]]>https://xcp-ng.org/forum/post/81093https://xcp-ng.org/forum/post/81093Wed, 31 Jul 2024 21:02:57 GMT