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Look cassandra is relative I/O dependent.EC instances have "insuficient" I/O by design (Xen virtualization) And my first recomendation is to use Cassandra on real hardware, where you have a control. e.g u can use SSD disk for CommitLog. Look at <a href="http://wiki.apache.org/cassandra/CassandraHardware" rel="nofollow">Cassandra hardware proposals</a>. However, switching to own hardware is a bit a radical option. To stay with Amazon try <a href="http://aws.amazon.com/en/ebs/" rel="nofollow">EBS</a> <blockquote> Amazon Elastic Block Store (EBS) provides block level storage volumes for use with Amazon EC2 instances. Amazon EBS volumes are network-attached, and persist independently from the life of an instance. Amazon EBS provides highly available, highly reliable, predictable storage volumes that can be attached to a running Amazon EC2 instance and exposed as a device within the instance. Amazon EBS is particularly suited for applications that require a database, file system, or access to raw block level storage. </blockquote> Amazon EBS allows you to create storage volumes from 1 GB to 1 TB that can be mounted as devices by Amazon EC2 instances. Multiple volumes can be mounted to the same instance. Amazon EBS enables you to provision a specific level of I/O performance if desired, by choosing a Provisioned IOPS volume. This allows you to predictably scale to thousands of IOPS per Amazon EC2 instance. Also check out <a href="http://www.hulen.com/post/22803493165/cassandra-performance-testing-on-ec2" rel="nofollow">Cassandra Performance Testing on EC2</a>
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1. POCassandra Amazon EC2, Read Performance experiments
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1. COEphermal ec2 instances by nature would be faster than EBS and without RAID10 they would be susceptible to EBS bubbles ( hangs or timeouts ). That said the fi* instances with SSD instances are exponentially faster
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2. CO@David in ec2 even "nature" is virtualized ;) But you're right. They are fast and they have better toughput. But EBS RAID performes better by random seek toughput [Compared here](http://victortrac.com/blog/2010/01/02/ec2-ephemeral-disks-vs-ebs-volumes-in-raid/). This might be more valuable for overal Cassandra performance.
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