From the
Get Your Cluster On dept.:
GlusterFS v2.0 has gone through a major revamp in design and development since v1.3. Thanks to thousands of initial users who provided us great feedback and bug reports. There are a number of production deployments now. GlusterFS uses existing disk file systems (such as Ext3, XFS, ZFS..) to store your data as regular files and folders. You can restore the data, even after you uninstall GlusterFS.
linux-kernel
gluster.org