MooseFS is a distributed file system designed to provide excellent performance, reliability and scalability available in two editions. Here is the summary of features

MooseFS MooseFS Pro
Scalability and performance
Flexible deployment options
POSIX compliance
Global namespace
Atomic snapshots
Global trash bin
Automatic rebalancing (also between hard disks)
Redundant copies for individual objects
Support for extended attributes
Support for ACLs
Support for quotas (per directory)
Support for global posix-locks (fcntl,lockf)
Support for global flock-locks (with fuse 2.9+)
Storage tiering (labels)
High Availability option for Master server
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