title: pg_upgradecluster taking too much time(around 8 hours for 165GB database) any workarounds?
body: <p>I am trying upgrade postgres-9.3 to postgres-10 with database size around 165GB. I am using "sudo pg_upgradecluster 9.3 main" to do so but it's taking around 8hours which is way too much downtime for my live webapp. Any suggestions to make it better with lesser downtime and faster.</p>