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From kurt greaves <>
Subject Re: Maximum and recommended storage per node
Date Sat, 29 Jul 2017 00:28:28 GMT
There are many different recommendations floating around, typically the
limit depends on how well you know Cassandra and your workload.

If your workload is CPU bound, you should go for more, less dense nodes. If
not, you can sustain higher data density per node. Typically I'd say the
usable range is anywhere from 800GB - 4TB, with a lower amount for read
heavy workloads. Aiming to keep nodes between 50-70% capacity.

Keep in mind that there are a lot of caveats to very dense nodes (>2GB).
The most important ones are bootstrapping/replacement times and repairs.
These will be greatly affected by how dense your nodes are. Compaction is
another notable one as that will only cause problems long after you've
started. You really need a good replacement strategy and an operations team
that really know their stuff before embarking on the very dense nodes
adventure. Start with smaller nodes if this is your first experience with
Cassandra, even if it costs you more.

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