Could you please explain what exactly technically would happen to the DMS if the Cassandra and/or ElasticSearch DB cluster would not be reachable for certain time?
These details are needed for cloud strategy justification and risk assessment.
What’s the consequence if the Cassandra DB and/or ElasticSearch cluster would be hosted in the Azure Cloud and the WAN gets interrupted for certain time?
Hi Jeroen,
DataMiner (once running) will continue to work when DB is unreachable. At that moment, DataMiner will go into offload mode and store all the information for DB into files. During that time it is possible that some functionality will not work (e.g. show trending or retrieve history alarms). After DB becomes back available DataMiner will offload all the information stored in files and all functionality should be back.
Keep in mind that it is not possible to start DataMiner without having your DB online.
The health of the Cassandra DB is as following:
Green means all nodes are up.
Yellow means that not all Cassandra nodes are up but that all DB operations should still succeed.
Red means that not all data is available and will indeed result in file offload being triggered and new writes/deletes will be written to C:\Skyline DataMiner\Offload\OffloadedData.sqlite3.