gfs2_jadd command is used to add journals to a GFS2 file system. You can add journals to a GFS2 file system dynamically at any point without expanding the underlying logical volume. The gfs2_jadd command must be run on mounted a file system, but it only needs to be run on one node in the cluster. All the other nodes sense that the expansion has occurred.
journals option of the gfs2_tool to find out how many journals the GFS2 file system currently contains. The following examples displays the number and size of the journals in the file system mounted at /mnt/gfs2.
[root@roth-01 ../cluster/gfs2]# gfs2_tool journals /mnt/gfs2
journal2 - 128MB
journal1 - 128MB
journal0 - 128MB
3 journal(s) found.
gfs2_jadd -j Number MountPoint
NumberMountPoint/mygfs2 directory.
gfs2_jadd -j1 /mygfs2
/mygfs2 directory.
gfs2_jadd -j2 /mygfs2
gfs2_jadd [Options] {MountPoint|Device} [MountPoint|Device]
MountPointDevice| Flag | Parameter | Description |
|---|---|---|
-h
| Help. Displays short usage message. | |
-J
|
MegaBytes
|
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 gfs2_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.
|
-j
|
Number
|
Specifies the number of new journals to be added by the gfs2_jadd command. The default value is 1.
|
-q
| Quiet. Turns down the verbosity level. | |
-V
| Displays command version information. |