DRBD (Distributed Replicated Block Device)
DRBD (Distributed Replicated Block Device)
Homepage: http://www.drbd.org/
实验环境需要两台电脑，如果你没有，建议你使用VMware，并且为每一个虚拟机添加两块硬盘。
实验环境
-
master: 192.168.0.1 DRBD:/dev/sdb
-
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 -l Disk /dev/sda: 8589 MB, 8589934592 bytes 255 heads, 63 sectors/track, 1044 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x000301bd Device 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 / Solaris Disk /dev/sdb: 2147 MB, 2147483648 bytes 255 heads, 63 sectors/track, 261 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x00000000 Device 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 r0 neo@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 2146627584 Found some data ==> This might destroy existing data! <== Do you want to proceed? [need to type 'yes' to confirm] yes v07 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 2146627584 Found some data ==> This might destroy existing data! <== Do you want to proceed? [need to type 'yes' to confirm] yes v07 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 11:56:43
0: 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:0
resync: used:0/31 hits:0 misses:0 starving:0 dirty:0 changed:0
act_log: used:0/127 hits:0 misses:0 starving:0 dirty:0 changed:0
1: 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