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.
