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diff --git a/Documentation/filesystems/gfs2.rst b/Documentation/filesystems/gfs2.rst new file mode 100644 index 000000000..1bc48a134 --- /dev/null +++ b/Documentation/filesystems/gfs2.rst @@ -0,0 +1,52 @@ +.. 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 + ============ ============================================= |