Installation of Cluster service consists of certain stages
1- Configure Hardware(shared Storage, Heartbeat NIC)
2- Install Failover Cluster feature
3- Create Cluster Group
4- Add shared Hardware
5- Install SQL 2005
6- Install SQL 2005 SP2
Here below some details.
Install Failover Cluster through Add features
Create Cluster Group
Add shared disk to the cluster group
Add more cluster nodes
Start Installing SQL Server 2005 on one of the cluster nodes.
The installation of SQL server 2005 is now completed.
if you look at the Failover Cluster Management Snap-in, you will find that the Cluster resources( Name of the cluster and IP and the SQL services) one of these services is failed to start, this is because compatibility issues with Windows Server 2008; the minimum supported version is SQL Server 2005 SP2, once it get installed everything will work fine.