Data Tiers on 3 nodes

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Hello,
My current setup is 3 nodes that are all master eligible, and have all roles assigned to them. As I am reading up on data tiers, and looking at setting up an ILM policy, I noticed that the settings for warm and cold default to using nodes that are optimized for these tiers.

With my current configuration, how would that work? Do they just get assigned randomly to one of the three nodes, since they all have the roles for hot, warm, cold? Is there a downside to doing it this way? I don't have the ability currently to scale horizontally, so stuck with just the three nodes at present. I couldn't really find anything helpful in my searching, but if this has already been asked before, I would love to have a link.

TYIA

2

You don't really need to think about data tiers if you only have a three-node cluster. Keep it simple and just stick to having all the nodes do everything. Data tiers only make sense if you have nodes with different hardware profiles (e.g. slower/larger disks on the colder nodes) which you can use to trade off performance against costs.

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