Attach disk from one VM to another VM with Ceph

[normic]

Hi,
I'd like to attach a single disk of a (restored) VM to another VM.

I detached the said disk from the old VM but how can I attach it to another VM?

I've tried qm importdisk <newvmid> CephPool:vm-detached-disk-name CephPool
But this gives me "non-existent or non-regular file"

Is this possible?

I thought it would be possible to reattach it without having to export and import it, as it's already on an available storage.

Thanks in advance.

 

[bbgeek17]

The command you are using is not meant for what you are trying to achieve:
qm importdisk <vmid> <source> <storage> [OPTIONS]
Import an external disk image as an unused disk in a VM. The image format has to be supported by qemu-img(1).

The Ceph volume in a PVE managed pool is neither external nor in supported format.
You can use "importdisk" for something like a locally located qcow or raw images.

The support for moving a disk between VMs has been recently introduced and you may or may not have it, depending on your level of PVE.
Check the man page for instructions:
qm move-disk <vmid> <disk> [<storage>] [OPTIONS]
Move volume to different storage or to a different VM.

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Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

 

[normic]

Thanks, I didn't know that feature. Unfortunately currently we are still on PVE 6 which does not have that option.

 

[bbgeek17]

Its still possible on older code, but the process is manual :
https://pve.proxmox.com/wiki/Moving_disk_image_from_one_KVM_machine_to_another

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Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox