复制卷
多个文件在多个brick上复制多份，brick 的数目要与需要复制的份数相等，建议brick分布在不同的服务器上。
复制卷和条带卷必须要指定卷的类型，复制卷就是每一个brick中的数据都是一样的，都是写入数据的完整备份。
所以容量会减少一半，当然性能上也会有所消耗.
应用场景: 对可靠性和读性能要求高的场景
优点： 读性能好
缺点： 写性能差</pre>
[root@node4 ~]# gluster
Welcome to gluster prompt, type 'help' to see the available commands.
创建复制卷
gluster> volume create datavol2 replica 2 transport tcp node1:/data0/gluster/data2 node2:/data0/gluster/data2 force #创建卷
volume create: datavol2: success: please start the volume to access data
启动volume
gluster> volume start datavol2
volume start: datavol2: success
查看volume状态
gluster> volume status datavol2
Status of volume: datavol2
Gluster process TCP Port RDMA Port Online Pid
------------------------------------------------------------------------------
Brick node1:/data0/gluster/data2 49153 0 Y 11961
Brick node2:/data0/gluster/data2 49153 0 Y 11858
Self-heal Daemon on localhost N/A N/A Y 12031
Self-heal Daemon on node3 N/A N/A Y 11857
Self-heal Daemon on node2 N/A N/A Y 11879
Self-heal Daemon on node1 N/A N/A Y 11982
Task Status of Volume datavol2
------------------------------------------------------------------------------
There are no active volume tasks
查看卷信息
gluster> volume info datavol2
Volume Name: datavol2
Type: Replicate
Volume ID: cb872ec7-6ce0-4635-bea2-d2e8d08dfac5
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: node1:/data0/gluster/data2
Brick2: node2:/data0/gluster/data2
Options Reconfigured:
transport.address-family: inet
storage.fips-mode-rchecksum: on
nfs.disable: on
performance.client-io-threads: off</pre>
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关于数据，存储节点会同步控制节点的数据，控制节点不会同步存储节点的数据
[root@node3 ~]# mount -t glusterfs node1:/datavol2/ /mnt
[root@node3 ~]# ls /mnt/
[root@node3 ~]# cd /mnt/
[root@node3 mnt]# touch a.txt #创建测试数据
测试
[root@node1 ~]# ls /data0/gluster/data2/
a.txt
[root@node2 ~]# ls /data0/gluster/data2
a.txt
条带卷
不支持了
将文件分成条带，存放在多个 brick上，默认条带大小128K
条带卷在处理大文件的时候会有一定的作用，它会将文件拆分几个部分，分别存在两个条带上即两个brick上。这个实际用的较少
应用场景: 大文件
优点： 适用于大文件存储
缺点： 可靠性低，brick 故障会导致数据全部丢失
创建条带卷
gluster> volume create datavol3 stripe 2 node01:/data0/gluster/data3 node02:/data0/gluster/data3 force
stripe option not supported
