DRBD部署实践

                                        DRBD部署实践

     DRBD作为廉价的存储级别复制方案，在很多场合被使用，比如Mysql HA,使用DRBD比较多

环境: rhel 5.8,使用相同的ntp服务器同步时间(这一步很重要)

dg1  192.168.245.101
dg1  192.168.245.102

以下两台服务器都需要安装
[root@dg1 ~]# rpm -Uvh drbd83-8.3.15-2.el5.centos.x86_64.rpm   
warning: drbd83-8.3.15-2.el5.centos.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID e8562897
Preparing...                ########################################### [100%]
   1:drbd83                 ########################################### [100%]

[root@dg1 ~]# rpm -Uvh kmod-drbd83-8.3.15-3.el5.centos.x86_64.rpm
warning: kmod-drbd83-8.3.15-3.el5.centos.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID e8562897
Preparing...                ########################################### [100%]
   1:kmod-drbd83            ########################################### [100%]

[root@dg1 ~]# fdisk -l /dev/sdb

Disk /dev/sdb: 64.4 GB, 64424509440 bytes
255 heads, 63 sectors/track, 7832 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1        7832    62910508+  83  Linux

查看drbd内核模块是否已经被加载

[root@dg1 ~]# lsmod | grep drbd
[root@dg1 ~]# modprobe drbd
[root@dg1 ~]# lsmod | grep drbd
drbd                  321608  0

 定义配置文件/etc/drbd.conf

resource r0{

protocol C;
startup { wfc-timeout 0; degr-wfc-timeout 120;}

disk { on-io-error detach;}

net{

   timeout 60;

   connect-int 10;

   ping-int 10;

   max-buffers 2048;

   max-epoch-size 2048;

}

syncer { rate 50M;}   --同步速度

on dg1{

   device /dev/drbd0;

   disk   /dev/sdb1;

   address 192.168.245.101:7788;

   meta-disk internal;

}

on dg2{

   device /dev/drbd0;

   disk   /dev/sdb1;

   address 192.168.245.102:7788

   meta-disk internal;

}

}

创建drbd设备

[root@dg1 ~]# drbdadm create-md r0
Writing meta data...
initializing activity log
NOT initialized bitmap
New drbd meta data block successfully created.

                --== Creating metadata ==--
As with nodes, we count the total number of devices mirrored by DRBD
at .

The counter works anonymously. It creates a random number to identify
the device and sends that random number, along with the kernel and
DRBD version, to usage.drbd.org.

* If you wish to opt out entirely, simply enter 'no'.
* To continue, just press [RETURN]
yes

再次创建

[root@dg1 ~]# drbdadm create-md r0
You want me to create a v08 style flexible-size internal meta data block.
There appears to be a v08 flexible-size internal meta data block
already in place on /dev/sdb1 at byte offset 10733953024
Do you really want to overwrite the existing v08 meta-data?
[need to type 'yes' to confirm] yes

Writing meta data...
initializing activity log
NOT initialized bitmap
New drbd meta data block successfully created.

启动drbd服务

[root@dg1 ~]# service drbd start
Starting DRBD resources: [ d(r0) ].......

[root@dg1 ~]# service drbd status
drbd driver loaded OK; device status:
version: 8.3.15 (api:88/proto:86-97)
GIT-hash: 0ce4d235fc02b5c53c1c52c53433d11a694eab8c build by , 2013-03-27 16:01:26
m:res  cs         ro                   ds                         p  mounted  fstype
0:r0   Connected  Secondary/Secondary  Inconsistent/Inconsistent  C

设置主设备，主设备就是当前正在使用的设备，

[root@dg1 ~]# drbdsetup /dev/drbd0 primary --force
[root@dg1 ~]# service drbd status
drbd driver loaded OK; device status:
version: 8.3.15 (api:88/proto:86-97)
GIT-hash: 0ce4d235fc02b5c53c1c52c53433d11a694eab8c build by , 2013-03-27 16:01:26
m:res  cs          ro                 ds                     p  mounted  fstype
...    sync'ed:    1.0%               (10144/10236)M
0:r0   SyncSource  Primary/Secondary  UpToDate/Inconsistent  C
[root@dg1 ~]#

当前正在同步，ro为1.0%,所以第二个设备状态是Inconsistent

[root@dg1 ~]# service drbd status
drbd driver loaded OK; device status:
version: 8.3.15 (api:88/proto:86-97)
GIT-hash: 0ce4d235fc02b5c53c1c52c53433d11a694eab8c build by , 2013-03-27 16:01:26
m:res  cs         ro                 ds                 p  mounted  fstype
0:r0   Connected  Primary/Secondary  UpToDate/UpToDate  C

稍过一段时间，再次查看，发现两边的设备已经同步完成了.接下来就是格式化和挂载了.