r/HyperV | reddlx

This is the first time I've tried to run VMs on Windows, and I keep getting this message after a while being on a black screen when lauching my VM

I tried downloading the ISO several times and tried different configurations, but nothing worked.

Thanks in advance.

u/Leafar-20 — 7 days ago

▲ 4 r/HyperV+1 crossposts

Hello,

i guess some of you will have some good tipps for me to solve my Hyper-V issue.

What happen:
yesterday was the second time a cluster node (of four with quorum) get isolated because 40 % of the packages cannot be transfert. I see that message in the System Eventlog von the specific host. Because of that, all virtual machines have i/o error because of the redirected storage path.

High level cluster overview:
As i said, the cluster contains four nodes (Win2022) with 4 x 25 GBit NICs. All four ports are aggregated in a set switch. On top of that switch i created one vNIC for CSV and Livemigration. Our Management and VM Netzwork are the same, so they are not separated.
The VM Storage is realised via FibreChannel.

Why i need help:
I've allready checked the switch if i can see some Ports up/down but nothing. We will raise the log level for potential future outages to maybe se a bit more.
I dont think its something on the network hardware, because i dont see any up/down on the switch and in the eventlogs. And because of four connections in a set switch it would see some ping outages to the host itself.

If you have futher question, i will anwser that too. Thank you very much for your time and help!

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u/teqqyde — 7 days ago

▲ 14 r/HyperV

Best Practices to structure CSVs for storing VMs? Lump it all together? Folders?

Hey all

wondering what people do for storing their VMs

I havent used hyperv in about a decade - old company used to lump disks in one folder and the other files all lumped into another.

What are people doing these days?

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u/sysadminmakesmecry — 4 days ago

▲ 5 r/HyperV

Hello,

I'm trying to figure out how hyper-v stretched cluster works. The documentation provided by Microsoft is "garbage" at best, lots of the caveats are missing. Is there a book, or a course on this that would help me?

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u/TheDaznis — 10 days ago

▲ 3 r/HyperV

I am trying to migrate some VMs from one CSV to another. When I open the wizard to do the migration, I'm able to see the VM and its associated files. However, the destination pane never loads, it simply sits there with a loading message. Has anyone encountered this before? How were you able to resolve it?

I have a message under Cluster Core Resources next to my server name about "Name resolution not yet available", is that related to my issue at all?

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u/caessys — 10 days ago

▲ 11 r/HyperV

Replication in StorageSpacesDirect

Possibly dumb question but I've been testing out Hyper V since (like many people) we've been finding VMware alternatives.

I'm setting up Storage Spaces Direct just using this:

https://learn.microsoft.com/en-us/windows-server/storage/storage-spaces/deploy-storage-spaces-direct?tabs=failover-cluster-manager

But I can't seem to get anything other than triple replication for storage -- is it possible to set this to double replication? We only have 3 physicals for the trial we're doing so that might mess with it but I can't really commit more physical servers to test that theory out.

u/RadiantOpposite4240 — 2 days ago

▲ 17 r/HyperV

Hyper-V host CPU utilization no longer reflects VM load — shows near-idle even when VMs are pegged at 100%

Anyone else run into this after a Windows update a few months back? My Hyper-V host CPU in Task Manager shows ~2% utilization no matter what my VMs are doing. A few months back it felt accurate — if a VM was under load, you'd see it on the host. Now it's completely disconnected.

To reproduce it, I wrote a Python script to max out every vCPU on a guest VM. htop inside the VM confirms all cores pinned at 100% (see screenshot — 12 threads running, load average 6.15). Meanwhile, the host Task Manager barely moves. The host is an Intel Xeon Gold 6526Y with 32 logical processors and 128GB RAM, so it's not a resource ceiling issue.

My theory is that a Windows update changed how Hyper-V reports guest CPU activity to the host's performance counters, or something shifted in the hypervisor scheduling layer. The VM is clearly doing real work — the host just stopped caring to report it.

Has anyone found a fix or rollback path? I'd rather not start bisecting months of cumulative updates blind.

u/eld101 — 19 hours ago