Hello Roger,
let me introduce the new feature released in ATC 10.5.2. We call it Database Lazy Loading and it is part of the bigger feature, which is Smart Migration (will be introduced in the near feature).
Lazy loading reduces EM downtime during the data migration especially for APM 10.0.0 and 10.1.0:
Former installer implementation migrates all data (vertices, edges, states) at once during upgrade.
New implementation
- migrates just vertices, edges and live states data during upgrade (part of installer)
- history states data are migrated in runtime on background
For APM releases 10.2 and higher shouldn't be problem to migrate the data.
Independently of the real size of the PostgreSQL Database we guarantee migration of the DB in 10 minutes (without backup).
If you running your environment on Linux, I would recommend to wait couple weeks on the fully new EM upgrade.
Thanks,
Zaneta