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1 | .. SPDX-License-Identifier: GPL-2.0 |
2 | ||
3 | ================== | |
e4731420 | 4 | Global File System |
720c2fc1 | 5 | ================== |
e4731420 | 6 | |
49f30789 | 7 | https://fedorahosted.org/cluster/wiki/HomePage |
e4731420 DT |
8 | |
9 | GFS is a cluster file system. It allows a cluster of computers to | |
10 | simultaneously use a block device that is shared between them (with FC, | |
11 | iSCSI, NBD, etc). GFS reads and writes to the block device like a local | |
12 | file system, but also uses a lock module to allow the computers coordinate | |
13 | their I/O so file system consistency is maintained. One of the nifty | |
14 | features of GFS is perfect consistency -- changes made to the file system | |
15 | on one machine show up immediately on all other machines in the cluster. | |
16 | ||
25985edc | 17 | GFS uses interchangeable inter-node locking mechanisms, the currently |
e9ccb73a | 18 | supported mechanisms are: |
e4731420 | 19 | |
720c2fc1 MCC |
20 | lock_nolock |
21 | - allows gfs to be used as a local file system | |
e4731420 | 22 | |
720c2fc1 MCC |
23 | lock_dlm |
24 | - uses a distributed lock manager (dlm) for inter-node locking. | |
25 | The dlm is found at linux/fs/dlm/ | |
e4731420 | 26 | |
e9ccb73a | 27 | Lock_dlm depends on user space cluster management systems found |
e4731420 DT |
28 | at the URL above. |
29 | ||
30 | To use gfs as a local file system, no external clustering systems are | |
720c2fc1 | 31 | needed, simply:: |
e4731420 | 32 | |
2fcb4a12 | 33 | $ mkfs -t gfs2 -p lock_nolock -j 1 /dev/block_device |
e4731420 DT |
34 | $ mount -t gfs2 /dev/block_device /dir |
35 | ||
e9ccb73a SW |
36 | If you are using Fedora, you need to install the gfs2-utils package |
37 | and, for lock_dlm, you will also need to install the cman package | |
49f30789 SW |
38 | and write a cluster.conf as per the documentation. For F17 and above |
39 | cman has been replaced by the dlm package. | |
e9ccb73a SW |
40 | |
41 | GFS2 is not on-disk compatible with previous versions of GFS, but it | |
42 | is pretty close. | |
e4731420 DT |
43 | |
44 | The following man pages can be found at the URL above: | |
720c2fc1 MCC |
45 | |
46 | ============ ============================================= | |
4cb947b5 AG |
47 | fsck.gfs2 to repair a filesystem |
48 | gfs2_grow to expand a filesystem online | |
49 | gfs2_jadd to add journals to a filesystem online | |
49f30789 | 50 | tunegfs2 to manipulate, examine and tune a filesystem |
720c2fc1 | 51 | gfs2_convert to convert a gfs filesystem to gfs2 in-place |
4cb947b5 | 52 | mkfs.gfs2 to make a filesystem |
720c2fc1 | 53 | ============ ============================================= |