High-Availability Storage With GlusterFS On Debian Lenny - Automatic File Replication (Mirror) Across Two Storage Servers

This tutorial shows how to set up a high-availability storage with two storage servers (Debian Lenny) that use GlusterFS.
Each storage server will be a mirror of the other storage server, and
files will be replicated automatically across both storage servers. The
client system (Debian Lenny as well) will be able to access the storage
as if it was a local filesystem. GlusterFS is a clustered file-system
capable of scaling to several peta-bytes. It aggregates various storage
bricks over Infiniband RDMA or TCP/IP interconnect into one large
parallel network file system. Storage bricks can be made of any
commodity hardware such as x86-64 servers with SATA-II RAID and
Infiniband HBA.

Source/Kaynak : http://www.howtoforge.com/high-availability-storage-with-glusterfs-on-debian-lenny-automatic-file-replication-across-two-storage-servers