@MajorP93 said:
What you are describing must be a storage live migration then (XenMotion). That should work across pools, yes. I stand corrected because I did not factor in this variant in my initial answer.

Yes, that's it - sorry - I should have been more explicit, even if 'lumbers along' wasn't a hint

//EDIT: also there is no such thing as non-pool hosts. Even a single host setup has it's own pool.

Pedantic, but true I technically meant 'not hosts in the source pool' I guess.

@florent

Yes, thanks!

We have very limited control over rsync at our end (as it's running within a Synoloy NAS) - I think we probably have to just live with large transfers for now - whilst looking at spit files / VHD's as the way to go in the future.

Thanks again!