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From Carlos Rolo <>
Subject Re: Multiple cassandra instances per physical node
Date Thu, 21 May 2015 18:25:18 GMT

I also advice against multiple instances on the same hardware. If you have
really big boxes why not virtualize?

Other option is experiment with CCM. Although there are some limitations
with CCM (ex: JNA is disabled)

If you follow up on this I would to hear how it went.
Em 21/05/2015 19:33, "Dan Kinder" <> escreveu:

> Hi, I'd just like some clarity and advice regarding running multiple
> cassandra instances on a single large machine (big JBOD array, plenty of
> First, I am aware this was not Cassandra's original design, and doing this
> seems to unreasonably go against the "commodity hardware" intentions of
> Cassandra's design. In general it seems to be recommended against (at least
> as far as I've heard from @Rob Coli and others).
> However maybe this term "commodity" is changing... my hardware/ops team
> argues that due to cooling, power, and other datacenter costs, having
> slightly larger nodes (>=32G RAM, >=24 CPU, >=8 disks JBOD) is actually a
> better price point. Now, I am not a hardware guy, so if this is not
> actually true I'd love to hear why, otherwise I pretty much need to take
> them at their word.
> Now, Cassandra features seemed to have improved such that JBOD works
> fairly well, but especially with memory/GC this seems to be reaching its
> limit. One Cassandra instance can only scale up so much.
> So my question is: suppose I take a 12 disk JBOD and run 2 Cassandra nodes
> (each with 5 data disks, 1 commit log disk) and either give each its own
> container & IP or change the listen ports. Will this work? What are the
> risks? Will/should Cassandra support this better in the future?



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