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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-cman has been replaced by the dlm package.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