博客

一、gluster Basic establishment

Brick:

A filesystem mountpoint

A *unit of storage used as a Glusterfs building block

Translator:

Logic between the bits and the Global Namespace

Layered to provide Glusterfs functionality

Volume:

bricks combined and passed though translators

Node/Peer

server running the gluster daemon and sharing volumes

二、Types of Volumes

（1）分布式卷：Distributed Glusterfs Volume



file只能存储在brick1或brick2中，但不能同时存储在两者中(一个文件来了是存在brick1还是brick2当中？用户不用操心，使用的是gluster的

弹性hash

计算出来的),不支持数据冗余，brick故障将导致数据完全丢失，只能依靠底层来保护数据(比如raid)

# gluster volume create NEW-VOLNAME [transport [tcp | rdma | tcp,rdma]] NEW-BRICK...
#gluster volume create test-volume server1:/exp1 server2:/exp2 server3:/exp3 server4:/exp4
Creation of test-volume has been successful
Please start the volume to access data

显示磁盘信息

#gluster volume info
Volume Name: test-volume
Type: Distribute
Status: Created
Number of Bricks: 4
Transport-type: tcp
Bricks:
Brick1: server1:/exp1
Brick2: server2:/exp2
Brick3: server3:/exp3
Brick4: server4:/exp4

（2）复制卷：Replicated Glusterfs Volume



数据存放多份，这个很好理解，就不说了，emmmmm…..

# gluster volume create NEW-VOLNAME [replica COUNT] [transport [tcp | rdma | tcp,rdma]] NEW-BRICK...
#gluster volume create test-volume replica 2 transport tcp server1:/exp1 server2:/exp2
Creation of test-volume has been successful
Please start the volume to access data

（3）分布式复制卷：Distributed Replicated Glusterfs Volume



结合Distributed 和 Replicated，比如设置 Distributed 2 Replicated 2，那么你存文件的时候就会存在Distributed 1的brick和Distributed 2的brick当中，但是存在那个上面是使用的gluster的弹性哈希，然后 Replicated 2 就是在复制一份，这两份Replicatied就是两个Distributed 进行复制

# gluster volume create NEW-VOLNAME [replica COUNT] [transport [tcp | rdma | tcp,rdma]] NEW-BRICK...

gluster volume create test-volume replica 2 transport tcp server1:/exp1 server2:/exp2 server3:/exp3 server4:/exp4
Creation of test-volume has been successful
Please start the volume to access data

（4）条带卷：Striped Glusterfs Volume



许多客户端经常同时访问该块，这将导致单块brick的负载过大，从而降低性能。在条带化模式中，数据将分成不同的条带后存储在brick当中。因此，大文件将被分成较小的块（等于卷中的块数）存放起来，每个块存储在一个brick当中。，但不提供数据冗余。

# gluster volume create NEW-VOLNAME [stripe COUNT] [transport [tcp | dma | tcp,rdma]] NEW-BRICK...
#gluster volume create test-volume stripe 2 transport tcp server1:/exp1 server2:/exp2
Creation of test-volume has been successful
Please start the volume to access data

（5）分布式条带卷：Distributed Striped Glusterfs Volume



一个文件存如到Distributed卷中，而每个Distributed又有多个 Striped卷，也就是一个文件存进来是存在Striped当中（分成多块存入，有几个Striped就分几块），而存放在哪个Distributed是根据弹性hash

#gluster volume create NEW-VOLNAME [stripe COUNT] [transport [tcp | rdma | tcp,rdma]] NEW-BRICK...
#gluster volume create test-volume stripe 4 transport tcp
 server1:/exp1 server2:/exp2 server3:/exp3 server4:/exp4 server5:/exp5 server6:/exp6 server7:/exp7 server8:/exp8
Creation of test-volume has been successful
Please start the volume to access data.