[PVE-User] Migration from server down

Alessandro Briosi ab1 at metalit.com
Thu May 4 10:06:15 CEST 2017

Il 04/05/2017 09:26, Fabian Grünbichler ha scritto:
> because without HA/fencing you have no guarantee that the other node
> is actually off, and not just not reachable. the same applies for any
> guests potentially running there. "stealing" the guest (configuration)
> is therefor potentially dangerous, and needs to be done manually. but
> yes, it is just as simple as verifying that the guest is actually not
> running on the other node (e.g., because the node is known to be
> physically off) and that it has no local dependencies (storage or
> otherwise) and then moving the file in /etc/pve.
> if there were a button for this on the GUI, people would use it without
> understanding the consequences, and then blame the tool instead of the
> user when something goes wrong ;)
> with HA, the HA stack takes care of this using
> - proper locking
> - fencing of non-quorate nodes
> this ensures that when the HA stack steals a config after the
> appropriate timeouts/.. have happened, there cannot be a
> conflict/inconsistency.

I understand, even if the host has no quorum it might be still running
the VM.

Maybe I'd prefer having a big fat warning before doing it than have the
customer call me 'cause the server is down and cannot be migrated from
the GUI.


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