Fencing and adding speed to read/write to glusterfs

http://forum.proxmox.com/threads/8623-Proxmox-2-node-cluster-fencing-device?p=48890#post48890

http://forum.proxmox.com/threads/16470-fencing-with-one-APC-Switch-Rack-PDU-node-with-redundant-power-supply

https://fedorahosted.org/cluster/wiki/FAQ/Fencing#fence_redundant_pwr

someone said :
"We currently use GlusterFS with our PHP app where the gluster volume is mounted under / (e.g. /dev/sda is already partitoned, then a gluster volume is created inside of it).  I've found a way to get the best performance from it is to read directly from the brick, but write to the volume."