Upgrade from a 1-server config to a 2-servers config

I'm wondering if it's OK to use this upgrade procedure:
- server1 is active but no replication configured (serves traffic)
- add server2, configure and start replication
- set server2 active (both servers accept traffic but no data replication done)
- stop traffic on server1, configure and start replication
- set server1 active; if a replication threshold has been reached on server1, start a duplicate procedure
- both servers accept traffic and DB are synchronized
This has the advantage of presenting no interruption of service, but I'm not sure it's the right way to proceed (do we need to force a duplicate even if no replication threshold is reached on server1?).
The alternative would be to stop both servers, configure and start replication on both, then set server1 active, start the duplicate procedure on server2 and set server2 active. This has the downside of not serving any traffic while both servers are being configured.
Christophe

Hi Christophe,
This is not really the correct procedure for this and would likely run into problems with e.g. consistency etc. The correct procedure is mush simpler actually:
1. server1 is active (serving traffic) but no replication is configured
2. Prepare server2 (install TimesTen, creste DSN definitions etc.)
3. Configure replication scheme at server1, including of course the definitions for the (not yet existing) datastore on server2 and start replication agent
4. Create datastore on server2 via a 'duplicate' operation from server1 (be sure to specify -setMasterRepStart)
5. server2 starts to serve traffic
This is the standard procedure for rolling out a replicated environment; it does not interrupt service at server1 and it ensures complete synchronisation of both datastores.
Regards,
Chris

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