Multiple Heartbeat Lans

[Steve Post]

The MC/Service Guard book says: "It is recommended that you configure heartbeats on all subnets, including those to be used for client data."
I'm having a hard time understanding how this is done.

Let me give my example with the gaping holes in it.

I have a 2 node cluster (called clust), with computer A and B on it.

Node A has 4 lan cards on 3 different subnets.
lan1 1.2.10.x is where the applications and main host connects are.
lan2 1.2.20.x is where the heartbeat mini network is.
lan3 1.2.30.x is a network that backs up filesystems to tape.
lan4 is unconfigured. It would be for lan failover.
Node B has the same configuration.

Here's what I can see for the clust.ascii file.

CLUSTER_NAME clust
FIRST_CLUSTER_LOCK_VG /dev/vg01

NODE_NAME nodeA
NETWORK_INTERFACE lan1
STATIONARY_IP 1.2.10.88
NETWORK_INTERFACE lan2
HEARTBEAT_IP 1.2.20.5
NETWORK_INTERFACE lan3
STATIONARY_IP 1.2.30.5
NETWORK_INTERFACE lan4

NODE_NAME nodeB
NETWORK_INTERFACE lan1
STATIONARY_IP 1.2.10.89
NETWORK_INTERFACE lan2
HEARTBEAT_IP 1.2.20.6
NETWORK_INTERFACE lan3
STATIONARY_IP 1.2.30.6
NETWORK_INTERFACE lan4

As shown above, I have only one heartbeat card on each node, not three. Do I change the words "STATIONARY_IP" to "HEARTBEAT_IP"?
My packages would run on lan1 on both nodes.

Thanks for any help.

[A. Clay Stephenson · Accepted solution]

You should at least change the STATIONARY_IP's to HEARTBEAT_IP's. This would give you two heartbeats on each node. That should be adequate if these LAN connections go through independent switches/hubs. Bear in mind that for a 2-node cluster you can simply use a crossover cable in lieu of a hub or switch for the heartbeat lan.

[Christopher McCray_1]

Hello,

The entry "HEARTBEAT_IP" means that that network interface is used as a heartbeat network and potentially data traffic. The answer is yes, if you want to have a heartbeat on all subnets, then you will need to change the "STATIONARY_IP" to "HEARTBEAT_IP" then cmcheckconf and cmapplyconf with the cluster down.

Everything should be just fine

Good luck

Chris

[Steve Post]

So you guys mean.....

NODE_NAME nodeA
NETWORK_INTERFACE lan1
HEARTBEAT_IP 1.2.10.88
NETWORK_INTERFACE lan2
HEARTBEAT_IP 1.2.20.5
NETWORK_INTERFACE lan3
HEARTBEAT_IP 1.2.30.5
NETWORK_INTERFACE lan4

NODE_NAME nodeB
NETWORK_INTERFACE lan1
HEARTBEAT_IP 1.2.10.89
NETWORK_INTERFACE lan2
HEARTBEAT_IP 1.2.20.6
NETWORK_INTERFACE lan3
HEARTBEAT_IP 1.2.30.6
NETWORK_INTERFACE lan4

Ok. I can do that. And even though I only have a two node network (soon). I have a heartbeat lan that has been around in anticipation of service guard.

Thanks. Points are coming.
steve