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From Brian Tarbox <>
Subject Re: Options for expanding Cassandra cluster on AWS
Date Tue, 19 Aug 2014 14:08:07 GMT
The last guidance I heard from DataStax was to use m2.2xlarge's on AWS and
put data on the ephemeral drive....have they changed this guidance?


On Tue, Aug 19, 2014 at 9:41 AM, Oleg Dulin <> wrote:

> Distinguished Colleagues:
> Our current Cassandra cluster on AWS looks like this:
> 3 nodes in N. Virginia, one per zone.
> RF=3
> Each node is a c3.4xlarge with 2x160G SSDs in RAID-0 (~300 Gig SSD on each
> node). Works great, I find it the most optimal configuration for a
> Cassandra node.
> But the time is coming soon when I need to expand storage capacity.
> I have the following options in front of me:
> 1) Add 3 more c3.4xlarge nodes. This keeps the amount of data on each node
> reasonable, and all repairs and other tasks can complete in a reasonable
> amount of time. The downside is that c3.4xlarge are pricey.
> 2) Add provisioned EBS volumes. These days I can get SSD-backed EBS with
> up to 4000 IOPS provisioned. I can add those volumes to "data_directories"
> list in Yaml, and I expect Cassandra can deal with that JBOD-style.... The
> upside is that it is much cheaper than option #1 above; the downside is
> that it is a much slower configuration and repairs can take longer.
> I'd appreciate any input on this topic.
> Thanks in advance,
> Oleg


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