DRS

In a DRS (Disaster Recovery System), all database configuration (datapoint types, datapoints and configs) is interchanged between the primary and secondary system via ASCII-exports in the primary system and ASCII-imports on the secondary system.

This is done by using the "-younger" option in ASCII-manager. That means, that every change since a given time stamp is exported, to transmit only the changes of the last synchronization cycle to the secondary system.

The following interchange of datapoints will therefore not work:

1. Initial state

   Primary system has a datapoint "Test", of datapoint-Typ "A-type".

   Secondary system has also this datapoint "Test" of Type "A-type"

2. Switch off the secondary system
3. Delete datapoint "Test" and datapoint-type "A-type" on the primary system and create a new "Test" with type "B-type" on the primary system
4. Start secondary system and wait for the next synchronization cycle
5. It the next synchronization is forced, an ASCII-export with DP "Test" of type "B-type" on the primary system will be done.
6. The import of this ASCII-export to the secondary system will fail, because in the secondary system a datapoint "Test" with the type "A-type" already exists.

Therefore it is not allowed to interchange datapoints of the same name between datapoint types when the secondary system is currently down.

Yes, it is allowed to use the same Project names for both DRS Systems (PSS and SSS).