MogileFS is our open source distributed filesystem.
http://danga.com/mogilefs/
Some of the advantages are

No Single point Failure
Automatic file replication
Better than RAID
Shared-Nothing — MogileFS doesn’t depend on a pricey SAN with shared disks. Every machine maintains its own local disks.
No RAID required — Local disks on MogileFS storage nodes can be in a RAID, or not. It’s cheaper not [...]

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