Upgrading cluster nodes to Windows 2000 Advanced Server occurs in four phases during which one node will be paused and upgraded while the other handles resource groups. The following steps outline how to perform a rolling upgrade.

1. Once the cluster nodes are running the required software, point to Start | Programs | Administrative Tools and click Cluster Administrator.

2. From within the Cluster Administrator tool, select the node to be upgraded first and click Pause Node from the File menu.
3. Your next step will be to move any groups from the first node to the second. Click the group you want to move and click Move Group from the File menu. Repeat this step for each group you want to move.
4. Upgrade the paused node to Windows 2000 Advanced Server. During setup, Microsoft Cluster Service will automatically be upgraded to Cluster Service for Windows 2000 Advanced Server.
5. Once the upgrade is complete, the node automatically rejoins the cluster but remains in a paused state.
6. Launch the Cluster Administrator tool and resume the node.
7. Repeat steps 1 through 6 to upgrade the second cluster node.

The four phases of performing a rolling upgrade:

• Phase 1: Verify that the cluster nodes are running the required software.

• Phase 2: Pause the node to be upgraded and move its groups to the second cluster node. The second cluster node handles resources and client requests.
• Phase 3: The paused cluster node is upgraded to Windows 2000 Advanced Server. The node automatically rejoins the cluster once the upgrade is complete. The node is then resumed.
• Phase 4: The second cluster node is paused and groups are moved back to the first cluster node. The upgrade is completed on the paused cluster node.

[tags]upgrade,diana huggins,cluster node,rolling upgrade,advanced server[/tags]