gfs2_tool(8)

NAME
gfs2_tool - interface to gfs2 ioctl/sysfs calls

SYNOPSIS
gfs2_tool COMMAND [OPTION]...

DESCRIPTION
gfs2_tool is an interface to a variety of the GFS2 ioctl/sysfs calls. Some of the functions of gfs_tool have been replaced by standard system tools such as mount and chattr, so gfs2_tool doesn't have as many options as gfs_tool used to.

COMMANDS

clearflag Flag File1 File2 ...
    Clear an attribute flag on a file. This is now obsolete and kept only for backward compatibility, chattr is the preferred way to clear attribute flags. See setflag for available flags. This option will probably be removed at a future date.

freeze MountPoint
    Freeze (quiesce) a GFS2 cluster.

gettune MountPoint
    Print out the current values of the tuning parameters in a running filesystem. A better source of similar (more comprehensive) information is that in the /proc/mounts file. Running the mount command with no arguments will also provide the same information. This option is considered obsolete and will probably be removed at some future date.

journals MountPoint
    Print out information about the journals in a mounted filesystem.

lockdump MountPoint
    Print out information about the locks this machine holds for a given filesystem. This information is also available via the debugfs glock dump file, and accessing that file is the preferred method of obtaining a dump of the glock state.

sb device proto [newvalue]
    View (and possibly replace) the name of the locking protocol in the file system superblock. The file system shouldn't be mounted by any client when you do this.

sb device table [newvalue]
    View (and possibly replace) the name of the locking table in the file system superblock. The file system shouldn't be mounted by any client when you do this.

sb device ondisk [newvalue]
    View (and possibly replace) the ondisk format number in the file system superblock. The file system shouldn't be mounted by any client when you do this. No one should have to use this.

sb device multihost [newvalue]
    View (and possibly replace) the multihost format number in the file system superblock. The file system shouldn't be mounted by any client when you do this. No one should have to use this.

sb device uuid [newvalue]
    View (and possibly replace) the uuid in the file system superblock. The file system shouldn't be mounted by any client when you do this. The new uuid value should be in the standard uuid format. For example: 1AEA8269-15C5-72BD-6D83-8720B17AA4EE

sb device all
    Print out the superblock.

setflag Flag File1 File2 ...
    Set an attribute flag on a file. The currently supported flags are jdata, immutable, appendonly, noatime, and sync. The chattr command is the preferred way to set attributes on files. This option will probably be removed at a future date. The jdata flag causes all the data written to a file to be journaled. If the jdata flag is set for a directory, all files and directories subsequently created within that directory are also journaled. This behavior replaces the old inherit_jdata flag from gfs. Same as chattr +j. The immutable flag marks the file immutable. The behavior is similar to the immutable flag in the ext2/3 filesystems. All write access is denied. Same as chattr +i. The appendonly flag causes all data to be written at the end of the file. Same as chattr +a. The noatime flag disables updates to the file's access time. Same as chattr +A. The sync flag causes data written to the file to be sync'ed to stable storage immediately. Same as chattr +S.

settune MountPoint parameter newvalue
    Set the value of tuning parameter. Use gettune for a listing of tunable parameters. The mount -oremount command is the preferred way to set the values of tunable parameters. At some future stage, when all parameters can be set via mount, this option will be removed.

unfreeze MountPoint
    Unfreeze a GFS2 cluster.

version
    Print out the version of GFS2 that this program goes with.

withdraw MountPoint
    Cause GFS2 to abnormally shutdown a given filesystem on this node. This feature is only useful for testing and should not be used during normal filesystem operation.