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I have several VMs created on a WS2012 Hyper-V host that I want to migrate to a WS2019 host. Preferably Live Migration. Not in a cluser.
I tried it and got this:
"There was an error during move operation. Virtual machine migration operation failed at migration destination. Microsoft RDV Component (Instance ID [GUID]): Failed to restore with Error 'Catastrophic failure'."
Searched on that text and found an anecdotal response here--
--on the old TechNet boards that said MS only supports N-2 versions and 2012 R2 (in his case; mine is 2012) is too old. Suspect that could well be true. He also said Live Migration worked with VHDs but not VHDXs. I have VHDXs.
So he used offline migration, and I guess I will have to as well.
But is Live Migration version support documented anywhere? I could not find it here--
--or in the other documents in the Live Migration topics there.
TIA
You can see the supported versions matrix here.
https://learn.microsoft.com/en-us/windows-server/virtualization/hyper-v/deploy/upgrade-virtual-machine-version-in-hyper-v-on-windows-or-windows-server
--please don't forget to upvote and 
if the reply is helpful--
Thanks for your reply, but that matrix is telling me which VM versions are supported on which host versions. It is not telling me across which versions I can use Live Migration.
Unless they're SUPPOSED to be the same versions, and my experience and that of the TechNet OP indicate a problem.
Successfully offline-migrated a VM, which also matches experience of TechNet guy.
He ended up using an intermediate WS2016 host. I won't have that luxury.
As far as I know that's too big of leap 2012 -> 2019 live migration.
--please don't forget to upvote and Accept as answer if the reply is helpful--
Prolly so...I'd go so far as to say, empirically so.
But wouldn't it be awesome for us admins with older-but-still-supported servers if there was an official reference that told us what we can and can't Live Migrate? Unless I'm still missing it, there isn't. I've submitted the suggestion; we'll see what happens.