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You can build Tableau 10 as a 2 node cluster, but it isnt 'high available'. You will need to have 3 nodes for that.
With Tableau 10, you dont have the option of replicated Repositories either.
Also, if one of the nodes fails, the other node will also shutdown
Therefore if you are after a 'proper' highly available cluster you should go for 3 nodes.
The 2 workers can be 64GB ram, and the primary doesnt need to be that powerful, as it is only handling licensing (and maybe gateway functionality)
All the best
Hi Manigandan. Same deal, but additionally in v10, you won't be able to run a failover Repository database unless you have three or more nodes (previous versions would let you get away with two). Note that you don't actually need the third node to do much of anything. It can simply be a VM that runs the Gateway and that's it, and it still counts as 3. So you wouldn't, in theory, need to invest money in more core licenses (if that's what you have), or an expensive piece of additional hardware.