replication

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XFS is a high-performance journaling file system created by Silicon Graphics, Inc. It was the default file system in IRIX releases 5.3 and onwards and later ported to the Linux kernel . XFS is particularly proficient at parallel IO due to its allocation group based design.

XFS

http://en.wikipedia.org/wiki/XFS
http://hadoopblog.blogspot.com/2009/08/hdfs-and-erasure-codes-hdfs-raid.html The Hadoop Distributed File System has been great in providing a cloud-type file system.

HDFS and Erasure Codes (HDFS-RAID)

http://issues.apache.org/jira/browse/HDFS-347

HDFS slower than expected reading from localnode

Attaching v1 of a design document for this feature.