Adding nodes to the cluster

This task provides step-by-step instructions about how to add nodes to the cluster using the SAN Volume Controller Console. A cluster must have a minimum of two nodes, otherwise, you must add at least one other node to the cluster so it has a minimum of two nodes.

Attention: Before adding a node to a cluster, make sure that the switch zoning is configured such that the node being added is in the same zone as all other nodes in the cluster. In particular, if you are replacing a node and the switch is zoned by worldwide port name (WWPN) rather than by switch port, you must update the switch configuration.

Before adding a node to the cluster check to see if any of the following conditions are true:

The cluster has more than one I/O group.
The node being added to the cluster uses physical node hardware which has previously been used as a node in the cluster.
The node being added to the cluster uses physical node hardware which has previously been used as a node in another cluster and both clusters have visibility to the same hosts.

Attention: If any of these conditions are true, then you must perform the following special procedures. Failure to perform the special procedure is likely to result in the corruption of all data managed by the cluster.

Assume that the cluster has been created.

From the Welcome panel, click Work with Nodes in the portfolio.
Click Nodes in the portfolio. The Nodes panel is displayed.
Figure 1. Nodes panel
Select Add Node from the drop down list and click Go.
Figure 2. Add Node drop down list
Attention: If you are re-adding a node to the SAN, ensure that you are adding the node to the same I/O group that it was removed from. Failure to do this can result in data corruption. Use the information that was recorded when the node was originally added to the cluster. If you do not have access to this information, call IBM Service to add the node back into the cluster without corrupting the data.
If you are adding the node into the cluster for the first time, record the following information:
- Node serial number
- WWNN
- All WWPNs
- I/O group that contains the node
This can avoid a possible data corruption exposure if the node must be removed from and re-added to the cluster.
Note: This warning also is displayed on the SAN Volume Controller Console panel when adding the node.
Select the node that you want to add from the list and the I/O group name that you want to add the node to and click OK. This will add the node to the I/O group.
Figure 3. Add Node to Cluster panel
Note:
1. Each node in an I/O group must be connected to a different uninterruptible power supply.
2. If you do not supply a name, the cluster assigns a default name to the object. Whenever possible you should provide a meaningful name for objects to make identifying that object easier in the future.
In our hypothetical scenario, the nodes are called:
```
knode and lnode
```
In our hypothetical scenario, the I/O group is called:
```
io_group0
```
In our hypothetical scenario, the nodes are called:
```
mnode and nnode
```
In our hypothetical scenario, the I/O group is called:
```
io_group1
```
Repeat step 4 for each of the nodes that you want to add to the cluster.