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34 | cman has been replaced by the dlm package.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