Questions regarding historical nodes

hey guys, I am studying druid and there are couple things that aren’t clear to me.

Once I reached the segmentcache space configured on druid.segmentCache.locations, what is the behavior of the cluster?

I didn’t understand or found how to setup Tiers for historical nodes. Can you guide me on where to find this information?

When a historical node segment cache is full, it will stop accepting new data. If all the historical nodes are full, then the cluster will not be able to ingest new data. Queries on old data will continue to work though.

You can set up tiers by configuring druid.server.tier, see here: http://druid.io/docs/latest/configuration/historical.html