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 김민수
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Global File System
https://fedorahosted.org/cluster/wiki/HomePage
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
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
lock_dlm
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. For F17 and above
cman has been replaced by the dlm package.
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
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
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