mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 17:08:10 +00:00
d9593868cd
Remove an obsolete URL and generally bring the doc up-to-date Signed-off-by: Andrew Price <anprice@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
52 lines
1.9 KiB
ReStructuredText
52 lines
1.9 KiB
ReStructuredText
.. 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
|
|
============ =============================================
|