Thanks for the explanation, Kane!

In case anyone is curious I decommissioned node7 and things re-balanced 
themselves automatically: https://i.imgur.com/EOxzJu9.png
(node8 received 422 GiB, while the others did receive 82-153 GiB,
as reported by "nodetool netstats -H")

Lapo

On 2021-03-03 23:59, Kane Wilson wrote:
> Well, that looks like your problem. They are logical racks and they come 
> into play when NetworkTopologyStrategy is deciding which replicas to put 
> data on. NTS will ensure a replica goes on the first node in a different 
> rack when traversing the ring, with the idea of keeping only one set of 
> replicas on a rack (so that a whole rack can go down without you losing 
> QUORUM).


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