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- .. SPDX-License-Identifier: GPL-2.0
- ====================
- Global File System 2
- ====================
- GFS2 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). GFS2 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 GFS2 is perfect consistency -- changes made to the file system
- on one machine show up immediately on all other machines in the cluster.
- GFS2 uses interchangeable inter-node locking mechanisms, the currently
- supported mechanisms are:
- lock_nolock
- - allows GFS2 to be used as a local file system
- lock_dlm
- - uses the 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 GFS2 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
- The gfs2-utils package is required on all cluster nodes and, for lock_dlm, you
- will also need the dlm and corosync user space utilities configured as per the
- documentation.
- gfs2-utils can be found at https://pagure.io/gfs2-utils
- GFS2 is not on-disk compatible with previous versions of GFS, but it
- is pretty close.
- The following man pages are available from gfs2-utils:
- ============ =============================================
- 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
- ============ =============================================
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