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1.. SPDX-License-Identifier: GPL-2.02 3====================4Global File System 25====================6 7GFS2 is a cluster file system. It allows a cluster of computers to8simultaneously use a block device that is shared between them (with FC,9iSCSI, NBD, etc). GFS2 reads and writes to the block device like a local10file system, but also uses a lock module to allow the computers coordinate11their I/O so file system consistency is maintained. One of the nifty12features of GFS2 is perfect consistency -- changes made to the file system13on one machine show up immediately on all other machines in the cluster.14 15GFS2 uses interchangeable inter-node locking mechanisms, the currently16supported mechanisms are:17 18 lock_nolock19 - allows GFS2 to be used as a local file system20 21 lock_dlm22 - uses the distributed lock manager (dlm) for inter-node locking.23 The dlm is found at linux/fs/dlm/24 25lock_dlm depends on user space cluster management systems found26at the URL above.27 28To use GFS2 as a local file system, no external clustering systems are29needed, simply::30 31 $ mkfs -t gfs2 -p lock_nolock -j 1 /dev/block_device32 $ mount -t gfs2 /dev/block_device /dir33 34The gfs2-utils package is required on all cluster nodes and, for lock_dlm, you35will also need the dlm and corosync user space utilities configured as per the36documentation.37 38gfs2-utils can be found at https://pagure.io/gfs2-utils39 40GFS2 is not on-disk compatible with previous versions of GFS, but it41is pretty close.42 43The following man pages are available from gfs2-utils:44 45 ============ =============================================46 fsck.gfs2 to repair a filesystem47 gfs2_grow to expand a filesystem online48 gfs2_jadd to add journals to a filesystem online49 tunegfs2 to manipulate, examine and tune a filesystem50 gfs2_convert to convert a gfs filesystem to GFS2 in-place51 mkfs.gfs2 to make a filesystem52 ============ =============================================53