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Amazon Web Services Developer Community : Configuring Amazon EC2 for RAID
developer.amazonwebservices.com/connect/entry.jspa?externalID=1074, posted 2009 by peter in howto recovery storage virtualization
A Redundant Array of Independent Drives (RAID) is a method of grouping multiple drives together to improve performance or fault tolerance. Because m1.large and m1.xlarge instances have multiple ephemeral stores, you can now use RAID with these instance types.