6.1. DRBD (Distributed Replicated Block Device)

实验环境

1. master: 192.168.0.1 DRBD:/dev/sdb

2. slave: 192.168.0.2 DRBD:/dev/sdb

Each of the following steps must be completed on both nodes

show all of disk and partition

neo@master:~$ sudo sfdisk -s
/dev/sda:   8388608
/dev/sdb:   2097152
total: 10485760 blocks

create a new partition on the disk /dev/sdb

$ sudo cfdisk /dev/sdb         

you must have extended partition

check partition

neo@master:~$ sudo fdisk -lDisk /dev/sda: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000301bdDevice Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1         993     7976241   83  Linux
/dev/sda2             994        1044      409657+   5  Extended
/dev/sda5             994        1044      409626   82  Linux swap / SolarisDisk /dev/sdb: 2147 MB, 2147483648 bytes
255 heads, 63 sectors/track, 261 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1         261     2096451    5  Extended
/dev/sdb5               1         261     2096419+  83  Linux

format /dev/sdb1

neo@master:~$ sudo mkfs.ext3 /dev/sdb1

you also can using other file system

reiserfs

neo@master:~$ sudo mkfs.reiserfs /dev/sdb1        

I suggest you using reiserfs.

Each of the following steps must be completed on both nodes

search drbd8-utils package

neo@master:~$ apt-cache search drbd
drbd8-utils - RAID 1 over tcp/ip for Linux utilities
drbd0.7-module-source - RAID 1 over tcp/ip for Linux module source
drbd0.7-utils - RAID 1 over tcp/ip for Linux utilities
drbdlinks - Manages symlinks into a shared DRBD partition

installation

neo@master:~$ sudo apt-get install drbd8-utils            

to add modules from the Linux Kernel

neo@master:~$ sudo modprobe drbd
neo@master:~$ lsmod |grep drbd
drbd                  213000  0
cn                      9632  1 drbd

Each of the following steps must be completed on both nodes

backup configure file

neo@master:~$ sudo cp /etc/drbd.conf /etc/drbd.conf.old

edit /etc/drbd.conf

global { usage-count yes;
}
common {protocol C;
}
resource r0 {on master {device    /dev/drbd0;disk      /dev/sdb5;address   192.168.0.1:7789;meta-disk internal;}on slave {device    /dev/drbd0;disk      /dev/sdb5;address   10.1.1.32:7789;meta-disk internal;}
}

Each of the following steps must be completed on both nodes.

neo@master:~$ sudo drbdadm create-md r0
neo@master:~$ sudo drbdadm attach r0
neo@master:~$ sudo drbdadm connect r0
neo@master:~$ sudo drbdadm -- --overwrite-data-of-peer primary r0neo@slave:~$ sudo drbdadm create-md r0
neo@slave:~$ sudo drbdadm attach r0
neo@slave:~$ sudo drbdadm connect r0

master

neo@master:~$ sudo drbdadm create-md r0
v08 Magic number not found
md_offset 2146725888
al_offset 2146693120
bm_offset 2146627584Found some data==> This might destroy existing data! <==Do you want to proceed?
[need to type 'yes' to confirm] yesv07 Magic number not found
v07 Magic number not found
v08 Magic number not found
Writing meta data...
initialising activity log
NOT initialized bitmap
New drbd meta data block sucessfully created.
success

slave

neo@slave:~# sudo drbdadm create-md r0
v08 Magic number not found
md_offset 2146725888
al_offset 2146693120
bm_offset 2146627584Found some data==> This might destroy existing data! <==Do you want to proceed?
[need to type 'yes' to confirm] yesv07 Magic number not found
v07 Magic number not found
v08 Magic number not found
Writing meta data...
initialising activity log
NOT initialized bitmap
New drbd meta data block sucessfully created.
success

status

neo@master:~$ cat /proc/drbd
version: 8.0.11 (api:86/proto:86)
GIT-hash: b3fe2bdfd3b9f7c2f923186883eb9e2a0d3a5b1b build by phil@mescal, 2008-02-12 11:56:430: cs:StandAlone st:Primary/Unknown ds:UpToDate/DUnknown   r---ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0resync: used:0/31 hits:0 misses:0 starving:0 dirty:0 changed:0act_log: used:0/127 hits:0 misses:0 starving:0 dirty:0 changed:01: cs:Connected st:Secondary/Secondary ds:Diskless/Inconsistent C r---ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0

master

neo@master:~$ sudo drbdadm primary all
neo@master:~$ sudo mkfs.reiserfs /dev/drbd0
neo@master:~$ sudo mkdir /mnt/drbd0
neo@master:~$ sudo mount /dev/drbd0 /mnt/drbd0/
neo@master:~$ sudo touch /mnt/drbd0/helloworld.tmp
neo@master:~$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1             7.6G  1.3G  6.0G  18% /
varrun                125M  216K  125M   1% /var/run
varlock               125M  8.0K  125M   1% /var/lock
udev                  125M   60K  125M   1% /dev
devshm                125M     0  125M   0% /dev/shm
/dev/drbd0            2.0G   33M  2.0G   2% /mnt/drbd0
neo@master:~$ sudo dd if=/dev/zero of=/mnt/drbd0/tempfile1.tmp bs=104857600 count=1
1+0 records in
1+0 records out
104857600 bytes (105 MB) copied, 0.564911 s, 186 MB/s
neo@master:~$ sudo umount /mnt/drbd0/
neo@master:~$ sudo drbdadm secondary all

slave

neo@slave:~$ sudo drbdadm primary all
neo@slave:~$ sudo mkdir /mnt/drbd0
neo@slave:~$ sudo mount /dev/drbd0 /mnt/drbd0/
neo@slave:~$ ls /mnt/drbd0/
helloworld.tmp  tempfile1.tmp