Hi! I have a similar issue with Proxmox 7.3 (nvme disks, amd cpu), I saw the "Failed unmounting Mount storage" message while shutting down proxmox being stuck with vm hanging. My use case/config is:
storage.cfg:
dir: storage_name
path /mnt/pve/storage_name
content rootdir,vztmpl,snippets,images,iso,backup
is_mountpoint 1
nodes _mynode
If I add a qcow or raw image (tried 250GB,160GB,32GB,4GB,1GB doesn't matter actually) to an existing vm (while running), the vm hangs, the host CPU get's higher than usual. I'm trying to stop the VM, sometimes qm stop works by killing/terminating the VM. Sometimes I have to restart the node. After restarting the node, VM is hanging agaion, qm stop is unpredictable ... last time it stopped the VM.
Removing the qcow2 (or raw) image ... (detaching and removing) makes the VM bootable again.
Is there a recommended way to attach RAW/QCOW2 images to a VM that I'm missing?
+ Just tried to add a 4GB raw image while the VM is stopped, the result is the same, the VM can't be started, qm stop kills it and i can start it only after detaching the image.
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Not saying that I would like to attach a raw image (pretty huge ~200GB) to multiple VMS, readonly as I would attach an ISO.