We need to migrate from WSS 3.0 to SharePoint 2013, as I understand there is no direct way to do this in single step, so we need to migrate first to 2010, then to 2013. As long as our content database is ~50gb (we have only one content database), I'm afraid that doing this by simple detach/attach will cause too long downtime.
Does SharePoint support this scenario, if yes, how:
- we make backup of WSS 3.0 content database also leave WSS 3.0 server running
- we restore backup from step 1 to intermediary server, upgrade it to 2010
- we restore backup from step 2 to new server, upgrade it to 2013
- now interesting part - can we somehow merge changes, that were done in WSS 3.0 during upgrade time into upgraded database in new servers?
Or there is completely different way to do this while having minimal downtime (read-only mode for content database is not an option, as having it read-only would be pretty much the same as downtime for us).