Regarding GFS

white.heron white white.heron at
Tue Feb 14 03:42:17 EST 2012

Global File System (GFS) is a shared disk file system for Linux computer clusters. This is not to be confused with the Google File System (also called GFS), a proprietary distributed filesystem developed by Google.

GFS and GFS2 differ from distributed file systems (such as AFS, Coda, or InterMezzo) because they allow all nodes to have direct concurrent access to the same shared block storage. In addition, GFS or GFS2 can also be used as a local filesystem.

GFS has no disconnected operating-mode, and no client or server roles. All nodes in a GFS cluster function as peers. Using GFS in a cluster requires hardware to allow access to the shared storage, and a lock manager to control access to the storage. The lock manager operates as a separate module: thus GFS and GFS2 can use the Distributed Lock Manager (DLM) for cluster configurations and the "nolock" lock manager for local filesystems. Older versions of GFS also support GULM, a server based lock manager which implements redundancy via failover.



 From: unix syzadmin <unixsyzadmin at>
To: General Red Hat Linux discussion list <redhat-list at> 
Sent: Sunday, February 5, 2012 3:54 AM
Subject: Regarding GFS

I have not worked on GFS before, but i am given additional resposibilities
to support the existing GFS clusters and model the news ones after them.

While I am currently going through the redhat documentation; I wanted
explore other avenues for quick help on precisely documenting how the
existing GPFS clusters are setup.

The current setup has 3 Linux nodes running RHEL4 Update 7, all of them are
allocated the same storage and access to the same GFS file-systems.

I am not sure if this is setup like a cluster and if can sustain a disk or
a node failure.

Please point or suggest me in the right direction.

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