1. Read the upgrade requirements and restrictions. 

Upgrade Requirements and Restrictions

2. Take the cluster out of production, disable resources, and ensure that shared data and system disks are backed up. If the cluster uses dual-string mediators for Solstice DiskSuite/Solaris Volume Manager, unconfigure the mediators. 

How to Prepare the Cluster for Upgrade (Rolling)

3. Upgrade the Solaris software, if necessary, to a supported Solaris update release. Optionally, upgrade VERITAS Volume Manager (VxVM).  

How to Upgrade to a Solaris Maintenance Update Release (Rolling)

4. Upgrade to Sun Cluster 3.1 4/04 framework and data-service software. If necessary, upgrade applications. If you upgraded VxVM, upgrade disk groups. 

How to Upgrade to Sun Cluster 3.1 4/04 Software (Rolling)

5. If the cluster uses dual-string mediators, reconfigure the mediators. Register new resource types, migrate existing resources to new resource types, modify resource type extension properties as needed, enable resources, and bring resource groups online. Upgrade the Sun Cluster module to Sun Management Center, if needed.  

How to Finish Upgrading to Sun Cluster 3.1 4/04 Software (Rolling)