Setting Up Network RAID1 With DRBD on Ubuntu 11

04/11/11 Setting Up Network RAID1 With DRBD On Ubuntu 11.10 | HowtoForge - Linux Howtos and Tutorials

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You are here: Home » Howtos » Linux » Ubuntu » Setting Up Network RAID1 With DRBD On Ubuntu 11.10

Setting Up Network RAID1 With DRBD On Ubuntu 11.10

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Submitted by falko (Contact Author) (Forums) on Sun, 2011-10-30 20:34. :: Ubuntu | High-Availability | Storage



6 27

Submitted by falko (Contact Author) (Forums) on Sun, 2011-10-30 20:34. :: Ubuntu | High-Availability | Storage

Setting Up Network RAID1 With DRBD On Ubuntu 11.10

Version 1.0 Author: Falko Timme <ft [at] falkotimme [dot] com>

Follow me on TwitterLast edited 10/28/2011

This tutorial shows how to set up network RAID1 with the help of DRBD on two Ubuntu 11.10 systems. DRBD stands forDistributed Replicated Block Device and allows you to mirror block devices over a network. This is useful for high-availability setups(like a HA NFS server) because if one node fails, all data is still available from the other node.

I do not issue any guarantee that this will work for you!

1 Preliminary NoteI will use two servers here (both running Ubuntu 11.10):

server1.example.com (IP address 192.168.0.100)

server2.example.com (IP address: 192.168.0.101)

Both nodes have an unpartitioned second drive (/dev/sdb) with identical size (30GB in this example) that I want to mirror over the network (network RAID1) with the help of DRBD.

It is important that both nodes can resolve each other, either through DNS or through /etc/hosts. If you did not create DNS records for server1.example.com and

server2.example.com, you can modify /etc/hosts on both nodes as follows:

server1/server2:

vi /etc/hosts

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127.0.0.1 localhost.localdomain localhost192.168.0.100 server1.example.com server1192.168.0.101 server2.example.com server2

# The following lines are desirable for IPv6 capable hosts::1 ip6localhost ip6loopbackfe00::0 ip6localnetff00::0 ip6mcastprefixff02::1 ip6allnodesff02::2 ip6allrouters

I'm running all the steps in this tutorial with root privileges, so make sure you're logged in as root:

sudo su

2 Synchronize Timeserver1/server2:

It is very important that both nodes have the same time. Therefore we install the ntp packages:

aptget install ntp ntpdate

3 Partition /dev/sdb



3 Partition /dev/sdbserver1/server2:

Right now, our partitioning looks as follows:

fdisk l

root@server1:~# fdisk l

Disk /dev/sda: 32.2 GB, 32212254720 bytes255 heads, 63 sectors/track, 3916 cylinders, total 62914560 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x000712c1

Device Boot Start End Blocks Id System/dev/sda1 * 2048 499711 248832 83 Linux/dev/sda2 501758 62912511 31205377 5 Extended/dev/sda5 501760 62912511 31205376 8e Linux LVM

Disk /dev/sdb: 32.2 GB, 32212254720 bytes255 heads, 63 sectors/track, 3916 cylinders, total 62914560 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000

Disk /dev/sdb doesn't contain a valid partition table

Disk /dev/mapper/server1root: 31.4 GB, 31415336960 bytes255 heads, 63 sectors/track, 3819 cylinders, total 61358080 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000

Disk /dev/mapper/server1root doesn't contain a valid partition table

Disk /dev/mapper/server1swap_1: 536 MB, 536870912 bytes255 heads, 63 sectors/track, 65 cylinders, total 1048576 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000



Disk identifier: 0x00000000

Disk /dev/mapper/server1swap_1 doesn't contain a valid partition tableroot@server1:~#

As you see, /dev/sdb is not partitioned. We change that now and create one big partition on it, /dev/sdb1:

fdisk /dev/sdb

root@server1:~# fdisk /dev/sdbDevice contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabelBuilding a new DOS disklabel with disk identifier 0xf7ab5969.Changes will remain in memory only, until you decide to write them.After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): <-- n

Command action e extended p primary partition (14)<-- p

Partition number (14, default 1): <-- 1

First sector (204862914559, default 2048): <-- ENTER

Using default value 2048Last sector, +sectors or +size{K,M,G} (204862914559, default 62914559): <-- ENTER

Using default value 62914559

Command (m for help): <-- t

Selected partition 1Hex code (type L to list codes): <-- 83

Command (m for help): <-- w

The partition table has been altered!

Calling ioctl() to reread partition table.Syncing disks.root@server1:~#

Now run

fdisk l

again, and you should find /dev/sdb1 in the output:



again, and you should find /dev/sdb1 in the output:

root@server1:~# fdisk l

Disk /dev/sda: 32.2 GB, 32212254720 bytes255 heads, 63 sectors/track, 3916 cylinders, total 62914560 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x000712c1

Device Boot Start End Blocks Id System/dev/sda1 * 2048 499711 248832 83 Linux/dev/sda2 501758 62912511 31205377 5 Extended/dev/sda5 501760 62912511 31205376 8e Linux LVM

Disk /dev/sdb: 32.2 GB, 32212254720 bytes64 heads, 51 sectors/track, 19275 cylinders, total 62914560 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0xf7ab5969

Device Boot Start End Blocks Id System/dev/sdb1 2048 62914559 31456256 83 Linux

Disk /dev/mapper/server1root: 31.4 GB, 31415336960 bytes255 heads, 63 sectors/track, 3819 cylinders, total 61358080 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000

Disk /dev/mapper/server1root doesn't contain a valid partition table

Disk /dev/mapper/server1swap_1: 536 MB, 536870912 bytes255 heads, 63 sectors/track, 65 cylinders, total 1048576 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000

Disk /dev/mapper/server1swap_1 doesn't contain a valid partition tableroot@server1:~#



nextSetting Up Network RAID1 With DRBD On Ubuntu 11.10 - Page 2

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Setting Up Network RAID1 With DRBD On Ubuntu 11.10 - Page 2

Copyright © 2011 Falko TimmeAll Rights Reserved.

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Setting Up Network RAID1 With DRBD on Ubuntu 11

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