HDFS is designed mostly for immutable files, stores three copies of everything in the default setup and has the whole hadoop calculation stuff. BeeGFS is close

HDFS is designed mostly for immutable files, stores three copies of everything in the default setup and has the whole hadoop calculation stuff. BeeGFS is closer to a normal NFS share. In the default setup it just stores the data once, striped over multiple machines and it supports efficient updates in-place etc.