upgrade from 8.0.3 to 8.1.0

["Dan The Man" <bitsandbytes88@xxxxxxxxxxx>]

Hi,
I have enough resources on my 3 postgresql servers to run more than one 
instance of postgres.  Is there a way to keep my production db up and 
running in 8.0.3 while I also run 8.1.0 on the same server?   Then, I could 
copy the data and support two databases until things looked good.  Then, I'd 
shutdown 8.0.3.

Thanks,
~DjK



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