Since it's a VM, can't you just make a backup of it, then try the upgrade and see if it works? If it doesn't, just delete it and restore the backup.
FWIW - I've never had an in-place upgrade work correctly across major versions, on any distro. I would be especially leery about RHEL 6 to 7, since that is a HUGE change.
Last edited by suicidaleggroll; 05-19-2015 at 03:08 PM.
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