gfs_jadd - Add journals to a GFS filesystem
gfs_jadd [OPTION]... <DEVICE|MOINTPOINT>...
gfs_jadd is used to add journals to a GFS filesystem after the device
upon which the filesystem resides has been grown. By running gfs_jadd
on a GFS filesystem, you are filling in space between the current end
of the filesystem and the end of the device upon which the filesystem
resides. When this operation is complete, the journal index is updated
so that machines mounting the filesystem at a later date will see the
newly created journals in addition to the journals already there.
Machines which are already running in the cluster are unaffected.
gfs_jadd will not use space that has been formatted for filesystem data
even if that space has never been populated with files.
You may only run gfs_jadd on a mounted filesystem, addition of journals
to unmounted filesystems is not supported. You only need to run
gfs_jadd on one node in the cluster. All the other nodes will see the
expansion has occurred when required.
You must be superuser to execute gfs_jadd. The gfs_jadd tool tries to
prevent you from corrupting your filesystem by checking as many of the
likely problems as it can. When growing a filesystem, only the last
step of updating the journal index affects the currently mounted
filesystem and so failure part way through the expansion process should
leave your filesystem in its original state.
You can run gfs_jadd with the -Tv flags to get a display of the current
state of a mounted GFS filesystem. This can be useful to do after the
journal addition process to see if the changes have been successful.
-j num The number of new journals to add. This defaults to 1.
The size of the new journals in megabytes. The defaults to 128MB
(the minimum size allowed is 32MB). If you want to add journals
of different sizes to the filesystem, you’ll need to run
gfs_jadd once for each different size of journal. The size you
specify here will be rounded down so that it is a multiple of
the journal segment size which was specified at filesystem
-h Help. Prints out a short usage message and exits.
-q Quiet. Turns down the verbosity level.
-T Test. Do all calculations, but do not write any data to the disk
and do not add journals. This is used to discover what the tool
would have done were it run without this flag. You probably want
to turn the verbosity level up in order to gain most information
from this option.
-V Version. Print version information, then exit.
-v Verbose. Turn up verbosity of messages.