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From Maxim Potekhin <potek...@bnl.gov>
Subject Re: ideal cluster size
Date Sat, 21 Jan 2012 04:34:56 GMT
You can also scale not "horizontally" but "diagonally",
i.e. raid SSDs and have multicore CPUs. This means that
you'll have same performance with less nodes, making
it far easier to manage.

SSDs by themselves will give you an order of magnitude
improvement on I/O.


On 1/19/2012 9:17 PM, Thorsten von Eicken wrote:
> We're embarking on a project where we estimate we will need on the order
> of 100 cassandra nodes. The data set is perfectly partitionable, meaning
> we have no queries that need to have access to all the data at once. We
> expect to run with RF=2 or =3. Is there some notion of ideal cluster
> size? Or perhaps asked differently, would it be easier to run one large
> cluster or would it be easier to run a bunch of, say, 16 node clusters?
> Everything we've done to date has fit into 4-5 node clusters.


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