RHCS ：Red Hat Cluster Suite 红帽集群组件
cman
rgmanager
ra
internal
script : lsb
/etc/rc.d/init.d/*
RH6.0
corosync(cman)
pacemaker (rgmanager)
corosync
1.4.5
2.3.0 (needle)
votequorum
gfs : Global File System
gfs2
dlm：Distributed Lock Manager
ocfs2 : Oracle Cluster File System
gfs ：google file system
LVM：Logical Volume Manager
cLVM : Cluster LVM
借助于HA的功能，将某节点对LVM操作通知给其它节点
集群组件 ：
RA : Lsb(/etc/init.d) , ocf(providers) , Legacy HB v1 , stonith
Cluster Infrastructure： heartbeat corosync cman (Cluster manager) keepalived
CRM :