How to deal with a system which needs to be up 24 hours a day, 7 days a week and 12 months a year?
The answer is delta migration and the idea is simple: prepare and setup the target system with all needed upgrades, new operating system and/or a new database. Install a fresh and clean content server.
Then migrate the old (and still up & running) system to the new target system in the background all day long. It will basically create a clone of the existing system and it does not really matter how long it will take.
The process just runs in the background without users even making notice of it. It will migrate bit by bit all documents and information to the target system. Once the first “wave” is finished, a second wave will begin, typically called “delta migration“.
With migration-center the process is fully controlled. The delta run will collect all documents changed since the first run and newly created content. The duration of the “delta” will be much shorter than the first run because it will skip all already scanned documents which haven’t changed since the last scan. Then there are more waves to follow – as many as needed (depending on the overall size of the repository) until the very last delta run will only take a few minutes or even seconds.