Based on kernel version
5.14. Page generated on
2021-08-31 10:40 EST.
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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 ============ =============================================