Failover Agents: adding a “shared-hostname” failover pair where VIPs are in use

198 viewsadl2099 Agent failover configuration shared hostname VIP
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Hi Dojo,

I'm looking for info on new failover pairs to be added into an existing cluster - so found this page
https://docs.dataminer.services/dataminer/Administrator_guide/Failover/About_DMA_Failover.html

I understand it is not possible (at least not by default) to mix VIP & Hostnames to manage failover pairs - is that correct?

Should I add new FAILOVER pairs of DMAs where VIPs are in use, is there still a restriction for VIP that main & stand-by DMA need to be on the same /24 subnet?

Thanks

Bert Buysschaert [SLC] [DevOps Advocate] Answered question

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It is indeed not supported to mix VIP and hostname failover pairs in the same cluster.

The main & stand-by DMA don't need to be on a /24 subnet specifically, it can be anything from /29 and larger. Both agents need to be able to assign the same IP address to their network adapter (not at the same time) and be reachable on it throughout the rest of the network.

Bert Buysschaert [SLC] [DevOps Advocate] Posted new comment
Alberto De Luca [DevOps Enabler] commented

Thanks for confirming Bert – I'd have only one last question – as you mention it doesn't have to be a /24, but anything from a /29 could work,
how about a /16?

E.g. is the DataMiner application able to manage something like:

-MAIN 10.10.8.10
-STBY 10.10.9.10

-VIP 10.10.10.10

It is not something I've seen so far, but if that is an option for the app, it might be a good test we would run to streamline the VIP across two new DataCentres where the expectation is having one site running the main DMA and the other hosting the stby DMA – basically one failover pair across 2 sites.
Bert Buysschaert [SLC] [DevOps Advocate] commented

That would work, however, keep in mind that all broadcast traffic on that /16 subnet (e.g. ARP) will be sent between the datacentres.