Glustefs Transport endpoint is not connected

[c_parapat]

Hello,

I try to configure glusterfs with 3 servers on centos platform.
After follow the way on howtoforge, i get some error when i try to looks with "df -h", or "ls".
Here is the output ;
================================================== ================
[root@sys-testbed3 glusterfs]# mount
/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/hda1 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
glusterfs#/etc/glusterfs/glusterfs.vol on /mnt/glusterfs type fuse (rw,allow_other,default_permissions,max_read=13107 2)
[root@sys-testbed3 glusterfs]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
8.9G 3.2G 5.3G 38% /
/dev/hda1 99M 34M 61M 36% /boot
tmpfs 189M 0 189M 0% /dev/shm
df: `/mnt/glusterfs': Transport endpoint is not connected
[root@sys-testbed3 glusterfs]# ls /mnt/glusterfs
ls: /mnt/glusterfs: Transport endpoint is not connected
[root@sys-testbed3 glusterfs]# ll /mnt/glusterfs
ls: /mnt/glusterfs: Transport endpoint is not connected
[root@sys-testbed3 glusterfs]# ll /mnt/
total 0
?--------- ? ? ? ? ? glusterfs
[root@sys-testbed3 glusterfs]#
================================================== ================
What it mean from that error ?

I really still not understand how the concept of this gluster work.
I have a plan to building cluster for storage server. The idea is, if the capacity of the current storage cluster system will empty i just add the new server with full storage and so on. So i can get more new capacity after adding a new server on the fly (maybe it could be Like youtube.com storage server). Can I do this with glusterfs ?
Please help me to do this, and correct me if i have something wrong here and sorry for my bad english.

Regards,

Parapat