Global File System | GFS

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Red Hat Global File System (GFS) is an open source, POSIX-compliant
cluster file system and volume manager that executes on Red Hat
Enterprise Linux servers attached to a storage area network (SAN). It
works on all major server and storage platforms supported by Red Hat.
The leading (and first) cluster file system for Linux, Red Hat GFS has
the most complete feature set, widest industry adoption, broadest
application support, and best price/performance of any Linux
cluster file system today.

    –
GFS released under the GPL |
More
    – Red Hat
Cluster Project Page
    – GFS
Project Page | Red Hat
Global File System

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The Windows File System |
The WinFS File System
For Windows Longhorn