How to Disconnect the Node from Shared Storage

You must maintain proper SCSI-bus termination during this procedure. The process by which you disconnect the node from shared storage depends on whether you have host adapters available on Node B (see Figure 2–1) . If you do not have host adapters available on Node B and your storage device does not have auto-termination, you must use terminators (see Figure 2–2).

To determine the specific terminator that your storage array supports, see your storage documentation. For a list of storage documentation, see Related Documentation.

1. Become superuser or assume a role that provides solaris.cluster.read and solaris.cluster.modify RBAC authorization.

2. Determine the resource groups and device groups that are running on Node A.

   Record this information because you use this information in How to Reconnect the Node to Shared Storage to return resource groups and device groups to this node.

   • If you are using Sun Cluster 3.2, use the following commands:

     # clresourcegroup status -n NodeA # cldevicegroup status -n NodeA

   • If you are using Sun Cluster 3.1, use the following command:

     # scstat

3. Identify the submirrors on the storage array that is connected to Node A.

4. Move all resource groups and device groups off Node A.

   • If you are using Sun Cluster 3.2, use the following command:

     # clnode evacuate NodeA

   • If you are using Sun Cluster 3.1, use the following command:

     # scswitch -S -h NodeA

5. (Optional) If necessary, detach the submirrors on the storage array that is connected to Node A.

   For more information, see your Solaris Volume Manager or Veritas Volume Manager documentation.

6. Shut down Node A.

   To shut down and power off a node, see your Sun Cluster system administration documentation.

7. To maintain proper SCSI-bus termination during this procedure, perform one of the following steps. The approach you choose depends on whether you have an available host adapter on Node B.

   • Disconnect the SCSI cable between Node A and the storage array. Attach this SCSI cable to Node B on the storage array. For an illustration, see Figure 2–1.

     Figure 2–1 Disconnecting the Node from Shared Storage by Using Host Adapters on Node B

     
     

   • Disconnect the SCSI cable between Node A and the storage array. Install an appropriate SCSI terminator to this SCSI connector on the storage array. For an illustration, see Figure 2–2.

     Figure 2–2 Disconnecting the Node from Shared Storage by Using Terminators

     
     

8. Boot Node A into cluster mode.

   For the procedure about booting cluster nodes, see Chapter 3, Shutting Down and Booting a Cluster, in Sun Cluster System Administration Guide for Solaris OS.

9. If you detached the submirrors in Step 5, reattach the submirrors. Wait for the submirrors to resynchronize.

   For more information, see your Solaris Volume Manager or Veritas Volume Manager documentation.

10. Repeat Step 5 through Step 9 for each remaining storage array that is connected to Node A.

11. Reconnect the node to the shared storage as outlined in How to Reconnect the Node to Shared Storage.