CLUSTERS


Setting up a private LAN for a cluster
Setting up a private LAN for your cluster separates the server probes and cluster replication from the rest of your network traffic. This prevents the cluster traffic from slowing down your primary network.

Follow this procedure to set up a private network for your cluster.

1. Install an additional network interface card in each server in the cluster. These cards should be connected through a private hub or switch.

2. Configure the LAN to use TCP/IP.

3. Assign a second IP address to each server. In a cluster using two servers, for example, you could use the addresses 192.168.64.1 and 192.168.64.2.

4. Assign host names for the new IP addresses, and place entries in the HOSTS file or the DNS. In a cluster using two servers, for example, you could assign the host names Acme_clu.acme.com and Acme2_clu.acme.com. The entries in the HOSTS file might then be:


5. Verify that the private LAN is operational by making sure that each cluster server can ping both the IP address and the host name of the other cluster servers. Also, be sure that other servers can still ping the cluster servers at their regular LAN addresses.

6. On each server in the cluster, add a new network port for the private LAN, and edit the Server document to enable the port.

7. Assign each port an IP address from the corresponding subnets, and place this information in the NOTES.INI file in the following form:
8. Do one of the following:
9. Restart the server.

Making sure Domino is using the private LAN

To verify that IBM® Lotus® Domino® is using the private LAN, you can do the following:

1. At the server console, type show cluster.

2. In the results, look for the line "Server cluster default port: Cluster Port"

3. If the cluster port is preventing mail from routing, or binding to SMTP, add this line to the Domino server's notes.ini file:
Making sure that cluster replication is using the private LAN

It is also a good idea to check the cluster to be sure that cluster replication is using the private LAN. To do this, you can look at some of the cluster statistics.

1. From the Domino Administrator or the Web Administrator, click the Server - Statistics tab.

2. In the list of statistics, expand NET.

3. Expand the port name you gave to the cluster.

4. Look for the following statistics for the private LAN port:


5. Expand Replica, and then expand Cluster.

6. Expand SessionBytes, and look for the following replication statistics for the cluster:


7. Compare the NET.portname.BytesReceived value with the Replica.Cluster.SessionBytes.In value.
8. Compare the NET.portname.BytesSent value with the Replica.Cluster.SessionBytes.Out value.
Related topics