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From Jared Biel <>
Subject Re: Cassandra at Amazon AWS
Date Wed, 16 Jan 2013 21:21:36 GMT
We're currently using Cassandra on EC2 at very low scale (a 2 node
cluster on m1.large instances in two regions.) I don't believe that
EBS is recommended for performance reasons. Also, it's proven to be
very unreliable in the past (most of the big/notable AWS outages were
due to EBS issues.) We've moved 99% of our instances off of EBS.

As other have said, if you require more space in the future it's easy
to add more nodes to the cluster. I've found this page
( very useful in determining the amount
of space each instance type has. Note that by default only one
ephemeral drive is attached and you must specify all ephemeral drives
that you want to use at launch time. Also, you can create a RAID 0 of
all local disks to provide maximum speed and space.

On 16 January 2013 20:42, Marcelo Elias Del Valle <> wrote:
> Hello,
>    I am currently using hadoop + cassandra at amazon AWS. Cassandra runs on
> EC2 and my hadoop process runs at EMR. For cassandra storage, I am using
> local EC2 EBS disks.
>    My system is running fine for my tests, but to me it's not a good setup
> for production. I need my system to perform well for specially for writes on
> cassandra, but the amount of data could grow really big, taking several Tb
> of total storage.
>     My first guess was using S3 as a storage and I saw this can be done by
> using Cloudian package, but I wouldn't like to become dependent on a
> pre-package solution and I found it's kind of expensive for more than 100Tb:
>     I saw some discussion at internet about using EBS or ephemeral disks for
> storage at Amazon too.
>     My question is: does someone on this list have the same problem as me?
> What are you using as solution to Cassandra's storage when running it at
> Amazon AWS?
>     Any thoughts would be highly appreciatted.
> Best regards,
> --
> Marcelo Elias Del Valle
> - @mvallebr

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