Proxmox Datacenter VM Migration

[mickyface]

Hello Family,

Please does Proxmox Datacenter VM migration requires all nodes to be on the same version?
I have three remote hosts on my PDM I tried migrating VM from PVE 8.2.2 to PVE 9.1.1 I had an error vm aborted, but when I migrating from 8.2.2 to 8.2.2 it worked.
Am afraid if I upgrade the 8.2.2 to 9.1.1 it will affect my production VMs, please any advise. thanks

 

[Johannes S]

If I recall correct you can migrate from an old node ( e.G. PVE8toPVE9) to a newer one but not the other way. And the versions need to be not too far off ( e.g. PVE7 to PVE9 is not supprted ). It might still work but it's not supported. So I would assume for migration in the Datacenter Manager. I might be wrong though

 

[mickyface]

If I recall correct you can migrate from an old node ( e.G. PVE8toPVE9) to a newer one but not the other way. And the versions need to be not too far off ( e.g. PVE7 to PVE9 is not supprted ). It might still work but it's not supported. So I would assume for migration in the Datacenter Manager. I might be wrong though

Sure Johannes, i this case study I was migrating from 8.2.2 to 9.1.1 but I had an error but 8.2.2 to 8.2.2 worked

 

[fabian]

please provide the full task log and VM config. .sometimes there are bugs affecting migration compatibility. in general we try hard to make old->new and new->new work, new->old isn't always possible to support.

 

[mickyface]

please provide the full task log and VM config. .sometimes there are bugs affecting migration compatibility. in general we try hard to make old->new and new->new work, new->old isn't always possible to support.

Hello Fabian, please see below errors when I tried to migrate from old to new and from old to old

2026-01-29 11:08:37 remote: started tunnel worker 'UPIDRT2:001B3EB9:03136B69:697B3FB2:qmtunnel:145:root@pam!pdm-admin-prt-pdm:'tunnel: -> sending command "version" to remotetunnel: <- got reply2026-01-29 11:08:37 local WS tunnel version: 22026-01-29 11:08:37 remote WS tunnel version: 22026-01-29 11:08:37 minimum required WS tunnel version: 2websocket tunnel started2026-01-29 11:08:37 starting migration of VM 134 to node 'PRT2' (100.64.26.130)tunnel: -> sending command "bwlimit" to remotetunnel: <- got reply2026-01-29 11:08:37 found local disk 'local-lvm:vm-134-disk-0' (attached)2026-01-29 11:08:37 copying local disk imagestunnel: -> sending command "disk-import" to remotetunnel: <- got reply2026-01-29 11:08:38 ERROR: error - tunnel command '{"migration_snapshot":"","cmd":"disk-import","with_snapshots":0,"snapshot":null,"volname":"vm-145-disk-0","storage":"local-lvm","export_formats":"raw+size","allow_rename":"1","format":"raw"}' failed - failed to handle 'disk-import' command - 400 Parameter verification failed.2026-01-29 11:08:38 ERROR: migration_snapshot: type check ('boolean') failed - got ''2026-01-29 11:08:38 aborting phase 1 - cleanup resourcestunnel: -> sending command "quit" to remotetunnel: <- got reply2026-01-29 11:08:39 ERROR: migration aborted (duration 00:00:02): error - tunnel command '{"migration_snapshot":"","cmd":"disk-import","with_snapshots":0,"snapshot":null,"volname":"vm-145-disk-0","storage":"local-lvm","export_formats":"raw+size","allow_rename":"1","format":"raw"}' failed - failed to handle 'disk-import' command - 400 Parameter verification failed.2026-01-29 11:08:39 ERROR: migration_snapshot: type check ('boolean') failed - got ''TASK ERROR: migration aborted

 

[fabian]

1. please use code tags to post logs or config files..
2. this is a bug that was fixed already, you need to upgrade PVE 8.x to a later version for it to be able to migrate to PVE 9.x