Software Subsystem	Components	Description
GFS	gfs.ko	Kernel module that implements the GFS file system and is loaded on GFS cluster nodes.
	gfs_fsck	Command that repairs an unmounted GFS file system.
	gfs_grow	Command that grows a mounted GFS file system.
	gfs_jadd	Command that adds journals to a mounted GFS file system.
	gfs_mkfs	Command that creates a GFS file system on a storage device.
	gfs_quota	Command that manages quotas on a mounted GFS file system.
	gfs_tool	Command that configures or tunes a GFS file system. This command can also gather a variety of information about the file system.
	lock_harness.ko	Implements a pluggable lock module interface for GFS that allows for a variety of locking mechanisms to be used (for example, the DLM lock module, lock_dlm.ko).
	lock_dlm.ko	A lock module that implements DLM locking for GFS. It plugs into the lock harness, lock_harness.ko and communicates with the DLM lock manager in Red Hat Cluster Suite.
	lock_gulm.ko	A lock module that implements GULM locking for GFS. It plugs into the lock harness, lock_harness.ko and communicates with the GULM lock manager in Red Hat Cluster Suite.
	lock_nolock.ko	A lock module for use when GFS is used as a local file system only. It plugs into the lock harness, lock_harness.ko and provides local locking.

redhat enterprise 4.5_gfs_各子軟體（或名：子系統）官方文件_

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