I think this is likely a bug with either mount or glusterfs:
[root at vm-container-0-0 ~]# cat /etc/fstab
LABEL=/ / ext3 defaults 1 1
LABEL=/state/partition /state/partition1 ext3 defaults 1 2
LABEL=/var /var ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
LABEL=SWAP-sda3 swap swap defaults 0 0
/dev/sdb1 /gluster ext3 defaults 0 1
/etc/glusterfs/glusterfs.vol /pifs/ glusterfs defaults 0 0
[root at vm-container-0-0 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 16G 2.6G 12G 18% /
/dev/sda5 883G 35G 803G 5% /state/partition1
/dev/sda2 3.8G 121M 3.5G 4% /var
tmpfs 7.7G 0 7.7G 0% /dev/shm
/dev/sdb1 917G 200M 871G 1% /gluster
none 7.7G 104K 7.7G 1% /var/lib/xenstored
glusterfs#/etc/glusterfs/glusterfs.vol
2.7T 600M 2.6T 1% /pifs
[root at vm-container-0-0 ~]# mount -a
[root at vm-container-0-0 ~]# mount -a
[root at vm-container-0-0 ~]# mount -a
[root at vm-container-0-0 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 16G 2.6G 12G 18% /
/dev/sda5 883G 35G 803G 5% /state/partition1
/dev/sda2 3.8G 121M 3.5G 4% /var
tmpfs 7.7G 0 7.7G 0% /dev/shm
/dev/sdb1 917G 200M 871G 1% /gluster
none 7.7G 104K 7.7G 1% /var/lib/xenstored
glusterfs#/etc/glusterfs/glusterfs.vol
2.7T 600M 2.6T 1% /pifs
glusterfs#/etc/glusterfs/glusterfs.vol
2.7T 600M 2.6T 1% /pifs
glusterfs#/etc/glusterfs/glusterfs.vol
2.7T 600M 2.6T 1% /pifs
glusterfs#/etc/glusterfs/glusterfs.vol
2.7T 600M 2.6T 1% /pifs
