I am working on requirement to host multi tenant Cassandra cluster (or set of 
clusters) on Amazon EC2 (AWS).

With everything else sorted out, I have below question where I am looking for 
recommendations:

Does Amazon's recent support of EBS optimized images changes whole discussion 
around EBS vs. ephemeral drives and image size?



*         Option 1: reserved m1.xlarge (4x420GB drives) is $0.187/hr

*         Option 2: reserved m1.large EBS-optimized  is $0.119/hr (~$50/month 
less than m1.xlarge, but $168/month for 4x420 standard EBS volumes): costs 
$120/month more, but additional recovery options

Given Cassandra is designed to survive failures, combining replication factor 3 
and backing-up to S3, I think should be enough for back up.

Please advise.

Thanks,
Rahul Gupta
DEKA Research & Development<http://www.dekaresearch.com/>
340 Commercial St  Manchester, NH  03101
P: 603.666.3908 extn. 6504 | C: 603.718.9676

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