Preparations - Novell SUSE LINUX ENTERPRISE SERVER 10 SP2 HEARTBEAT Manual

• The disks contained in the shared disk system should be configured to use mirroring
or RAID to add fault tolerance to the shared disk system. Hardware-based RAID
is recommended. Software-based RAID1 is not supported for all configurations.
• If you are using iSCSI for shared disk system access, ensure that you have properly
configured iSCSI initiators and targets.

2.4 Preparations

Prior to installation, execute the following preparatory steps:
• Configure hostname resolution by either setting up a DNS server or by editing the
/etc/hosts file on each server in the cluster as described in
with YaST
hosts
to find each other by name. If the names are not available, internal cluster commu-
nication will fail.
• Configure time synchronization by making Heartbeat nodes synchronize to a time
server outside the cluster as described in
Time Synchronization
time synchronization source.
Heartbeat does not require that time is synchronized for each of the nodes in the
cluster, however, it is highly recommended if you ever plan to look at logfiles.
Procedure 2.1 Modifying /etc/hosts with YaST
1 On one SLES 10 server, open YaST, and in left column, select Network Services
> Hostnames.
2 In the Host Configuration window, click Add and fill in the necessary information
in the pop-up window for one other server in the cluster.
This information includes the IP address, hostname (for example node2.nov-
ell.com), and host alias (for example node2) of the other server.
Use node names for host aliases. You can find node names by executing uname
-n at a command prompt on each server.
(page 15). It is essential that members of the cluster are able
(page 16). The cluster nodes will use the time server as their
Configuring the Heartbeat Servers for
Modifying
/etc/
Installation and Setup 15