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+Global File System
+GFS is a cluster file system. It allows a cluster of computers to
+simultaneously use a block device that is shared between them (with FC,
+iSCSI, NBD, etc). GFS reads and writes to the block device like a local
+file system, but also uses a lock module to allow the computers coordinate
+their I/O so file system consistency is maintained. One of the nifty
+features of GFS is perfect consistency -- changes made to the file system
+on one machine show up immediately on all other machines in the cluster.
+GFS uses interchangeable inter-node locking mechanisms, the currently
+supported mechanisms are:
+ lock_nolock -- allows gfs to be used as a local file system
+ lock_dlm -- uses a distributed lock manager (dlm) for inter-node locking
+ The dlm is found at linux/fs/dlm/
+Lock_dlm depends on user space cluster management systems found
+at the URL above.
+To use gfs as a local file system, no external clustering systems are
+needed, simply:
+ $ mkfs -t gfs2 -p lock_nolock -j 1 /dev/block_device
+ $ mount -t gfs2 /dev/block_device /dir
+If you are using Fedora, you need to install the gfs2-utils package
+and, for lock_dlm, you will also need to install the cman package
+and write a cluster.conf as per the documentation. For F17 and above
+cman has been replaced by the dlm package.
+GFS2 is not on-disk compatible with previous versions of GFS, but it
+is pretty close.
+The following man pages can be found at the URL above:
+ fsck.gfs2 to repair a filesystem
+ gfs2_grow to expand a filesystem online
+ gfs2_jadd to add journals to a filesystem online
+ tunegfs2 to manipulate, examine and tune a filesystem
+ gfs2_convert to convert a gfs filesystem to gfs2 in-place
+ mkfs.gfs2 to make a filesystem