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Diffstat (limited to 'Documentation/filesystems/gfs2.txt')
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diff --git a/Documentation/filesystems/gfs2.txt b/Documentation/filesystems/gfs2.txt new file mode 100644 index 00000000..4cda9266 --- /dev/null +++ b/Documentation/filesystems/gfs2.txt @@ -0,0 +1,46 @@ +Global File System +------------------ + +http://sources.redhat.com/cluster/wiki/ + +GFS 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). GFS 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 GFS is perfect consistency -- changes made to the file system +on one machine show up immediately on all other machines in the cluster. + +GFS uses interchangeable inter-node locking mechanisms, the currently +supported mechanisms are: + + lock_nolock -- allows gfs to be used as a local file system + + lock_dlm -- uses a 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 gfs 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 + +If you are using Fedora, you need to install the gfs2-utils package +and, for lock_dlm, you will also need to install the cman package +and write a cluster.conf as per the documentation. + +GFS2 is not on-disk compatible with previous versions of GFS, but it +is pretty close. + +The following man pages can be found at the URL above: + fsck.gfs2 to repair a filesystem + gfs2_grow to expand a filesystem online + gfs2_jadd to add journals to a filesystem online + gfs2_tool to manipulate, examine and tune a filesystem + gfs2_quota to examine and change quota values in a filesystem + gfs2_convert to convert a gfs filesystem to gfs2 in-place + mount.gfs2 to help mount(8) mount a filesystem + mkfs.gfs2 to make a filesystem |