A few people have sent me links to a new and potentially interesting open source filesystem called Cloud Store. CloudStore (formerly, Kosmos filesystem) is an open-source high performance distributed filesystem designed to meet the needs of distributed cloud computing infrastructures.
CloudStore is integrated with Hadoop and Hypertable. This enables applications built on these systems to seamlessly use CloudStore as the underlying data store. So it looks good for Amazon EC2, or Enomaly ECP.
CloudStore is deployed on Solaris and Linux platforms for storing web log data, crawler data, business continuity, and disaster recover solutions and could be backed to S3 using ElasticDrive.
CloudStore source code is released under the terms of the Apache License Version 2.0.
We'll probably be playing with it, I'll let you know how it goes.