Red Hat ENTERPRISE LINUX 4 - GLOBAL FILE SYTEM Manual page 36

Chapter 4. Managing GFS
After running the gfs_jadd command, run a gfs_jadd command with the -T and -v flags enabled
to check that the new journals have been added to the file system.
Examples
In this example, one journal is added to the file system on the /gfs1 directory.
gfs_jadd -j1 /gfs1
In this example, two journals are added to the file system on the /gfs1 directory.
gfs_jadd -j2 /gfs1
In this example, the current state of the file system on the /gfs1 directory is checked for the new
journals.
gfs_jadd -Tv /gfs1
Complete Usage
gfs_jadd [Options] {MountPoint | Device} [MountPoint | Device]
MountPoint
Specifies the directory where the GFS file system is mounted.
Device
Specifies the device node of the file system.
Table 4.4, "GFS-specific Options Available When Adding Journals"
that can be used when adding journals to a GFS file system.
Flag Parameter
-h
-J MegaBytes
-j Number
-T
26
describes the GFS-specific options
Description
Help. Displays short usage message.
Specifies the size of the new journals in megabytes.
Default journal size is 128 megabytes. The minimum
size is 32 megabytes. To add journals of different sizes
to the file system, the gfs_jadd command must be
run for each size journal. The size specified is rounded
down so that it is a multiple of the journal-segment size
that was specified when the file system was created.
Specifies the number of new journals to be added by the
gfs_jadd command. The default value is 1.
Test. Do all calculations, but do not write any data to the
disk and do not add journals to the file system. Enabling
this flag helps discover what the gfs_jadd command