Neither me. I like to say that only reason to cluster DS it that you have so many clients that one DS cannot manage it. Currently official values is probably 25k after that one recommended host cannot server those with reasonable load and response times. If you are just needing HA feature then it's better to automate you DS configurations and also automate build up DS and use only names in any configurations. Then if your primary DS will got broken/unavailable etc., then just build a new one and redeploy configurations to it. Of course this probably enforce all your clients to reload their apps and then restart splunkd. Anyhow I strongly recommend to all, that use DS GUI just to look situation, but never ever use it for configure DS. All configurations should be (or must) in e.g. git and you have way to deploy those as needed into (any) DS.
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