1.Creating Volumes
node A nodeB trusted storage pool
lv1 lv2 lv3 lv4
brick1 brick2 brick3 brick4
volume
client native nfs samba mount
volume的类型
RHGS以三种方式将bricks合并成为volume：Distributed Replicated and Dispersed
这三种类型的volume可以进行整合：
Distributed-Replicated volumes and Distributed-Dispersed volume
Distributed Volumes
创建volume不赋予参数，默认创建distribute volumes
使用场景：容量>可用性场景
创建distrubuted Volumes
使用gluster volume create 命令，不带任何参数创建
gluster volume create distributedvolume <bricks>
gluster volume create help