1 .. SPDX-License-Identifier: GPL-2.0 1 .. SPDX-License-Identifier: GPL-2.0
2 2
3 ==================== !! 3 ==================
4 Global File System 2 !! 4 Global File System
5 ==================== !! 5 ==================
6 6
7 GFS2 is a cluster file system. It allows a clu !! 7 https://fedorahosted.org/cluster/wiki/HomePage
>> 8
>> 9 GFS is a cluster file system. It allows a cluster of computers to
8 simultaneously use a block device that is shar 10 simultaneously use a block device that is shared between them (with FC,
9 iSCSI, NBD, etc). GFS2 reads and writes to th !! 11 iSCSI, NBD, etc). GFS reads and writes to the block device like a local
10 file system, but also uses a lock module to al 12 file system, but also uses a lock module to allow the computers coordinate
11 their I/O so file system consistency is mainta 13 their I/O so file system consistency is maintained. One of the nifty
12 features of GFS2 is perfect consistency -- cha !! 14 features of GFS is perfect consistency -- changes made to the file system
13 on one machine show up immediately on all othe 15 on one machine show up immediately on all other machines in the cluster.
14 16
15 GFS2 uses interchangeable inter-node locking m !! 17 GFS uses interchangeable inter-node locking mechanisms, the currently
16 supported mechanisms are: 18 supported mechanisms are:
17 19
18 lock_nolock 20 lock_nolock
19 - allows GFS2 to be used as a local file s !! 21 - allows gfs to be used as a local file system
20 22
21 lock_dlm 23 lock_dlm
22 - uses the distributed lock manager (dlm) !! 24 - uses a distributed lock manager (dlm) for inter-node locking.
23 The dlm is found at linux/fs/dlm/ 25 The dlm is found at linux/fs/dlm/
24 26
25 lock_dlm depends on user space cluster managem !! 27 Lock_dlm depends on user space cluster management systems found
26 at the URL above. 28 at the URL above.
27 29
28 To use GFS2 as a local file system, no externa !! 30 To use gfs as a local file system, no external clustering systems are
29 needed, simply:: 31 needed, simply::
30 32
31 $ mkfs -t gfs2 -p lock_nolock -j 1 /dev/bloc 33 $ mkfs -t gfs2 -p lock_nolock -j 1 /dev/block_device
32 $ mount -t gfs2 /dev/block_device /dir 34 $ mount -t gfs2 /dev/block_device /dir
33 35
34 The gfs2-utils package is required on all clus !! 36 If you are using Fedora, you need to install the gfs2-utils package
35 will also need the dlm and corosync user space !! 37 and, for lock_dlm, you will also need to install the cman package
36 documentation. !! 38 and write a cluster.conf as per the documentation. For F17 and above
37 !! 39 cman has been replaced by the dlm package.
38 gfs2-utils can be found at https://pagure.io/g <<
39 40
40 GFS2 is not on-disk compatible with previous v 41 GFS2 is not on-disk compatible with previous versions of GFS, but it
41 is pretty close. 42 is pretty close.
42 43
43 The following man pages are available from gfs !! 44 The following man pages can be found at the URL above:
44 45
45 ============ ====================== 46 ============ =============================================
46 fsck.gfs2 to repair a filesystem 47 fsck.gfs2 to repair a filesystem
47 gfs2_grow to expand a filesystem 48 gfs2_grow to expand a filesystem online
48 gfs2_jadd to add journals to a f 49 gfs2_jadd to add journals to a filesystem online
49 tunegfs2 to manipulate, examine 50 tunegfs2 to manipulate, examine and tune a filesystem
50 gfs2_convert to convert a gfs files !! 51 gfs2_convert to convert a gfs filesystem to gfs2 in-place
51 mkfs.gfs2 to make a filesystem 52 mkfs.gfs2 to make a filesystem
52 ============ ====================== 53 ============ =============================================
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