I waited 48 hours and the journal didn't complete its recovery.
I resolved the issue as follows:
kill power to the server,
pull the Hdds of the raid (that are symlinked into the boot disk's filesystem)
Restart the server, which completed normally
Shutdown.
Re-insert the raid storage Hdds
Restart the server, which completed normally.
A mystery, but it has a happy ending...for now
HTH
David