[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

gfs2_jadd -j1 /mygfs2

gfs2_jadd -j2 /mygfs2

gfs2_jadd [Options] {MountPoint | Device} [MountPoint | Device]

[root@roth-01 ~]# chattr +j /mnt/gfs2/gfs2_dir/newfile
[root@roth-01 ~]# lsattr /mnt/gfs2/gfs2_dir
---------j--- /mnt/gfs2/gfs2_dir/newfile

[root@roth-01 ~]# chattr -j /mnt/gfs2/gfs2_dir/newfile
[root@roth-01 ~]# lsattr /mnt/gfs2/gfs2_dir
------------- /mnt/gfs2/gfs2_dir/newfile

[root@roth-01 ~]# chattr -j /mnt/gfs2/gfs2_dir
[root@roth-01 ~]# lsattr /mnt/gfs2
---------j--- /mnt/gfs2/gfs2_dir
[root@roth-01 ~]# touch /mnt/gfs2/gfs2_dir/newfile
[root@roth-01 ~]# lsattr /mnt/gfs2/gfs2_dir
---------j--- /mnt/gfs2/gfs2_dir/newfile

 17592186044416 / 4096 = 4294967296

4294967296 * 5/8 = 2684354560

fsck.gfs2 -y BlockDevice

[root@dash-01 ~]# fsck.gfs2 -y /dev/testvg/testlv
Initializing fsck
Validating Resource Group index.
Level 1 RG check.
(level 1 passed)
Clearing journals (this may take a while)...
Journals cleared.
Starting pass1
Pass1 complete
Starting pass1b
Pass1b complete
Starting pass1c
Pass1c complete
Starting pass2
Pass2 complete
Starting pass3
Pass3 complete
Starting pass4
Pass4 complete
Starting pass5
Pass5 complete
Writing changes to disk
fsck.gfs2 complete

mount --bind olddir newdir

[root@menscryfa ~]# cd ~root
[root@menscryfa ~]# mkdir ./tmp
[root@menscryfa ~]# mount --bind /var/log /root/tmp

/var/log                /root/tmp               none    bind            0 0

[root@menscryfa ~]# mount | grep /tmp
/var/log on /root/tmp type none (rw,bind)

/usr/i386-bin
/usr/x86_64-bin
/usr/ppc64-bin

mount --bind /usr/i386-bin /bin

/usr/1386-bin             /bin               none    bind            0 0

# mount --bind /var/log /tmp

#!/bin/bash
#
# chkconfig: 345 29 73
# description: mount/unmount my custom bind mounts onto a gfs2 subdirectory
#
#
### BEGIN INIT INFO
# Provides: 
### END INIT INFO

. /etc/init.d/functions
case "$1" in
  start)
	# In this example, fred and wilma want their home directories
	# bind-mounted over the gfs2 directory /mnt/gfs2a, which has
	# been mounted as /mnt/gfs2a
	mkdir -p /mnt/gfs2a/home/fred &> /dev/null
	mkdir -p /mnt/gfs2a/home/wilma &> /dev/null
	/bin/mount --bind /mnt/gfs2a/home/fred /home/fred
	/bin/mount --bind /mnt/gfs2a/home/wilma /home/wilma
        ;;

  stop)
	/bin/umount /mnt/gfs2a/home/fred
	/bin/umount /mnt/gfs2a/home/wilma
        ;;

  status)
        ;;

  restart)
        $0 stop
        $0 start
        ;;

  reload)
        $0 start
        ;;
  *)
        echo $"Usage: $0 {start|stop|restart|reload|status}"
        exit 1
esac

exit 0