GFS2

In <a href="/facts/Computing/Kghtm9fX">computing</a>, the Global File System 2 (GFS2) is a <a href="/facts/Clustered_file_system/Bz61f7Ce">shared-disk file system</a> for <a href="/facts/Linux/9FvCKSTq">Linux</a> computer clusters. GFS2 allows all members of a cluster to have direct concurrent access to the same shared <a href="/facts/Block_storage/S3vT7c6N">block storage</a>, in contrast to <a href="/facts/Clustered_file_system/Bz61f7Ce">distributed file systems</a> which distribute data throughout the cluster. GFS2 can also be used as a local file system on a single computer. 
GFS2 has no disconnected operating-mode, and no client or server roles. All nodes in a GFS2 cluster function as peers. Using GFS2 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 GFS2 can use the <a href="/facts/Distributed_lock_manager/CGvJQHH9">distributed lock manager</a> (DLM) for <a href="/facts/Cluster_(computing)/mT7S1BcX">cluster</a> 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.
GFS and GFS2 are <a href="/facts/Free_software/IaoVtJXn">free software</a>, distributed under the terms of the <a href="/facts/GNU_General_Public_License/S75KhLSX">GNU General Public License</a>.

GFS2 open-in-new

GFS2