/ 11.2. Configuring the DRBD Service
	Chapter 11. Distributed Replicated Block Device (DRBD)		11.3. Testing the DRBD Service

Configuring the DRBD Service


The following procedure uses the server names node 1 and node 2, and the cluster resource name r0. It sets up node 1 as the primary node. Make sure to modify the instructions to use your own node and file names.

Start YaST and select the configuration module Miscellaneous+drbd.
In Start-up Configuration+Booting select On to start drbd always at boot time.
If you need to configure more than one replicated resource, select Global Configuration. The input field Minor Count selects how many different drbd resources may be configured without restarting the computer.

The actual configuration of the resource is done in Resource Configuration. Press Add to create a new resource. The following parameters have to be set:

Resource Name	The name of the resource, often called `r0`.
Name	The hostname of the respective node.
Address:Port	The IP address and port number of the respective node.
Device	The device that holds the replicated data on the respective node. Use this device to create file systems and mount operations.
Disk	The device that is replicated between both nodes.
Meta-disk	The Meta-disk is either set to the value `internal` or specifies an explicit device extended by an index to hold the meta data needed by drbd. When using `internal`, the last 128 MB of the replicated device are used to store the meta data. A real device may also be used for multiple drbd resources. For example, if your Meta-Disk is `/dev/sda6[0]` for the first resource, you may use `/dev/sda6[1]` for the second resource. However, there must be at least 128 MB space for each resource available on this disk.

All of these options are explained in the examples in the /usr/share/doc/packages/drbd/drbd.conf file and in the man page of drbd.conf(5).

Copy the /etc/drbd.conf file to the /etc/drbd.conf location on the secondary server (node 2).
```
scp /etc/drbd.conf <node 2>:/etc
```
Initialize and start the DRBD service on both systems by entering the following on each node:
```
drbdadm create-md r0
rcdrbd start
```
Configure node1 as the primary node by entering the following on node1:
```
drbdsetup /dev/drbd0 primary --overwrite-data-of-peer
```
Check the DRBD service status by entering the following on each node:
```
rcdrbd status
```
Before proceeding, wait until the block devices on both nodes are fully synchronized. Repeat the rcdrbd status command to follow the synchronization progress.
After the block devices on both nodes are fully synchronized, format the DRBD device on the primary with a file system such as reiserfs. Any Linux file system can be used. For example, enter
```
mkfs.reiserfs -f /dev/drbd0 
```
Always use the /dev/drbd<n> name in the command, not the actual /dev/disk device name.


Always use the `/dev/drbd<n>` name in the command, not the actual `/dev/disk` device name.