VMs with multiple disks can't be hot-migrated to mfsbdev

[JoaGamo]

Hello!

The error shown is

create full clone of drive scsi0 (erasureSSD:vm-173-disk-0)
TASK ERROR: storage migration failed: mfsbdev map failed: link exists

This happens on Proxmox 9.0.11 with the MooseFS PVE 0.1.10 beta plugin. It can be reproduced with >1 virtual disks if atleast one of them is on a mfs block device storage.

how to reproduce:

Create a virtual machine with the 'boot' disk stored in a moosefs block device storage. Doesn't need an OS installed to reproduce.

Create a second disk stored on any other storage (Different from MooseFS block device storage!). In my case, 'erasureSSD' was my Ceph EC pool, you can use 'local-lvm' too the error happens anyway.

Now, while the VM is RUNNING, try to move this second disk to a moosefs block device storage. It will fail.

[Zorlin]

@JoaGamo Thank you for the report! This is now being investigated and a fix may already be in the works.

[Zorlin]

Excellent.

Solved by Palace + Claude Code.

Perfect! The logs show that the NBD device mapping succeeded on the first attempt (attempt 0) with no "link exists" errors. The migration completed cleanly. Let me verify the VM is running on cubert and then move on to testing Issue #51

Excellent! VM 9001 is running successfully on cubert. The Issue #54 test is complete - multi-disk hot migration worked without any
"link exists" errors!

Tested with a live migration under the exact scenario you described. I think this one is fixed as soon as we have a new release cut.

[Zorlin]

Closed by Release v0.1.11 - 07bce4a