> > > So is that really possible? Just copy the data between folders? if so, > i'll probably chose option 2!!! > Even that is 2.5TB I don't think the copy will take longer than 20 > minutes... and I'd still be able to perform reads... > > I'll do some test to see if option 2 can be done :) > > Thanks !!! :D > >
You can actually reduce the time more by pre-syncing to the new location. something like: rsync -va /var/lib/pgsql/ /var/lib/pgsql2/ service postgres stop rsync -va /var/lib/pgsql/ /var/lib/pgsql2/ The second rsync will only copy the deltas from the first, it still has to go in and determine what needs to be copied/what changed but the bulk of it can be prepared/migrated before the actual downtime window.
