select best cloud filesystem for two server [closed]

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http://serverfault.com – Please help choose best parallel fault-tolerant file systems for two server - server1 = 1.7T centos 6.2 - server2 = 1.6T centos 5.8 Distributed parallel fault-tolerant file systems: - XtreemFS http://www.xtreemfs.org/ (wrinten on java, not best speed/memory usage) - kosmosfs http://code.google.com/p/kosmosfs/ (wrinten on c++) - Quantcast File System (based on KFS) https://github.com/quantcast/qfs - POHMELFS (alternative HFS) P.S. server1 used web HTTP download files with nginx PPS. choose best parallel fault-tolerant and connect server2 to server1 curent server1 no free disk space.. server1 (HowTos)