- What actions occur in the background while a primary DMA is going offline and the backup DMA is going online?
- Does the number of elements running or the amount of data stored in the Database affect the failover switching time?
Bruno Dias [SLC] [DevOps Member] Selected answer as best 29th January 2021
1.
The online DMA (primary DMA) will stop polling the elements, and the offline DMA (backup DMA) will begin polling of the elements. Also the virtual IP will be removed from the primary DMA and activated on the backup DMA.
Potentially there are other actions happening in the background, but the ones I mentioned are the most noticeable ones.
2. Yes, the number of elements largely defines how long the switch over will take, since the backup DMA needs to start up these elements on it's server.
Jeroen Geldhof [SLC] [DevOps Enabler] Answered question 22nd December 2020