holdsteady
Well-known member
- Joined
- 8 Dec 2017
- Messages
- 10,052
You plan the data mapping in advance, build a converter before turning off the old system, you don't do it after decommissioning the original system. In fact, best practice is to build the new system entirely beforehand, do practice data migrations to find any issues, and when happy reset and migrate. It certainly shouldn't take 2 weeks, I've migrated systems from legacy AS400 systems into SAP, a system with a vastly different data structure, with only 48hrs downtime. Closed business on the Friday on the old system, opened up the following Monday on the new system.
In your experience would you say its fairly likely that something has gone wrong for it to take this long?