Disks Migrate from one VM to another in LVM-Thin

[Tacioandrade]

Hello, I was looking for a way to migrate a particular disk from VM 101 to VM 103 in a simplified way, without having to use the dd command to overwrite the data on the target VM, searching Google found in the documentation the following command:

# lvchange --deltag pve-vm-400 --addtag pve-vm-2300 pve/vm-2300-disk-1

Using the modified command, it presents the following error:

# lvchange --deltag pve-vm-101 --addtag pve-vm-103 pve/vm-103-disk-0
Failed to find logical volume "pve/vm-103-disk-0"

Does anyone know what I went wrong? I thought it was the storage, but when I run the following command works, but the disk 101 is not moved to 103.

# lvchange --deltag pve-vm-101 --addtag pve-vm-103 pve/vm-101-disk-0
Logical volume pve/vm-101-disk-0 changed.

Thanks in advance for your help.

 

[Dominic]

What is the output of

lvs
lvs -o lv_tags pve/vm-103-disk-1
lvs -o lv_tags pve/vm-101-disk-0

 

[Tacioandrade]

What is the output of

lvs
lvs -o lv_tags pve/vm-103-disk-1
lvs -o lv_tags pve/vm-101-disk-0

Disk vm-103-disk-1 does not exist, I would like to move disk vm-101-disk-1 to VM 103, turning it into vm-103-disk-1

Apparently the TAG has changed, but the HD still appears on VM 101 and not 103

root@pve01:~# lvs -o lv_tags pve/vm-103-disk-1
Failed to find logical volume "pve/vm-103-disk-1"
root@pve01:~# lvs -o lv_tags pve/vm-101-disk-0
LV Tags
pve-vm-103

 

[Tacioandrade]

Would anyone know how to do this?

In case I just want to migrate the vm-101-disk-0 disk to VM 103, no matter what ID it gets, I just wanted to have a simplified way to move or copy the hard drive from one VM to another.

 

[Dominic]

I guess you found this step 5 of the documentation? It says

If you're using this option (...), then you have to update the disk's tag.

However, we're not using this option as default. When you add a new hard disk on an lvm storage no tag is set. The whole step 5 is, as the heading suggests, only a fixup for if tags are used.

I've just added a new section about moving disks in LVM storages to the wiki. It should answer your question and I'd be delighted at your feedback.

 

[Tacioandrade]

I guess you found this step 5 of the documentation? It says

However, we're not using this option as default. When you add a new hard disk on an lvm storage no tag is set. The whole step 5 is, as the heading suggests, only a fixup for if tags are used.

I've just added a new section about moving disks in LVM storages to the wiki. It should answer your question and I'd be delighted at your feedback.

It worked perfectly, thank you very much for updating the documentation !!!