You can cluster consistency of data centers?

We currently lack two separate groups of coherence in the different data centers. One is prod the other DR.

Would it not possible for nodes in each cluster to create a cluster that spans two data centers? Then in a failover scenario data would be available.

I know that pulse of nodes of coherence between them to keep the members of the classes and there is a TTL parameter to determine the life of package. Would have nodes in data centres resulting in pulses being missed or TTLs killing packages?

Did anyone had success with this?

Performance of coherence is related to the latency between the nodes. Having a single distributed cluster on 2 data centers might harm performance (some wait times might have to be changed to prevent the nodes from A data center to claim another node in datacenter B is out of scope/possibly dead).

When you lose the network connectivity between 2 data centers (note I do not say "If you lose connectivity". This WILL happen), you are welcome in the 'world of split brain', each half of the grid to believe the other is dead and who claim to be the 'master '. And so if you have a replicated data on N nodes, master backups are sent back in each data center, performance for a few minutes (the time of course depends on many parameters...). And of course the data will no longer be synchronized between 2 data centers. The quorum must be thought out and stuff like that...

I could be wrong, but as far as I know I'd rather have 2 separate groups. I think 12.1 has new features to replicate the data the main grid to the Dominican Republic one, I was not through any new documentation.

Tags: Fusion Middleware

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