will this upgrade strategy work?

Good afternoon, team.

We wish to do a postgres upgrade from 9.4 to 9.6. In order to minimize
downtime we were thinking to do this:
1. bring postgres down (9.4 is on 'diskset 1')
2. do a physical copy of the data to 'diskset 2' (same phyxical server.
3. do an inplace pg_upgrade to 9.6 on 'diskset 2'
4. Bring postgres up on 9.6 diskset 2
This way we have 9.4 on diskset 1 to fall back on.

This would work much faster than the traditional dump restore.

Any comments welcome. Thanks.

--
*Mark Steben*
Database Administrator
@utoRevenue <http://www.autorevenue.com/> | Autobase
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