Adding Gbit interface to ServiceGuard

[Fedon Kadifeli]

We have a cluster with two (hardware-identical) V-class machines.

# ioscan -fkC lan | grep Base
lan 0 0/0/0 btlan6 CLAIMED INTERFACE HP A3738A PCI 10/100Base-TX Ultimate Combo
lan 6 0/3/0 gelan CLAIMED INTERFACE HP A4926A PCI 1000Base-SX Adapter
lan 1 3/1/0 btlan6 CLAIMED INTERFACE HP A3738A PCI 10/100Base-TX Ultimate Combo
lan 2 5/1/0 btlan6 CLAIMED INTERFACE HP A3738A PCI 10/100Base-TX Ultimate Combo
lan 7 6/2/0 gelan CLAIMED INTERFACE HP A4929A PCI 1000Base-T Adapter
lan 3 7/1/0 btlan6 CLAIMED INTERFACE HP A3738A PCI 10/100Base-TX Ultimate Combo


Currently the cluster is using lan0 as the primary interface, while lan3 is the standby interface, and lan1 & lan2 are used for heartbeat. All these are 100Base-TX (copper) interfaces.

I am planning to introduce lan6 (1000Base-SX, i.e., FC) interface into ServiceGuard. lan6 will be the primary interface of ServiceGuard and the machine itself. In other words I will disable lan0. (The same change will be done on both machines.) However I want to still use lan3 (100Base-TX, copper) interface as the standby interface.

Do you think that I will have any problem in using a 100Mbit interface, as the standby interface of a Gbit primary interface?

I will appreciate any recommendations.

[monasingh_1]

There should absolutely be no problem. You have more than enough lan cards configured with separate hearbeat as well.

[Mohanasundaram_1 · Accepted solution]

Hi,

If I understand you, You are going to replace lan0 with lan6.

There should not be any problem, except that 100Mbps may be slower compared to your Gigabit LAN. This scenario comes when primary lan6 fails and standby lan3 has taken over.

I am assuming that you are going for Gigabit card as you need more bandwidth. In that case, it implies that you are ready to run the show with 100mbps in case of any problem in primary lan6.

Of course, you need to redistribute the cluster configuration while replacing lan0 to lan6.

Hope this helps.

Cheers,
Mohan.

[Fedon Kadifeli]

Thanks for the answers.

It looks like the only change to be done is in file /etc/cmcluster/cmclconf.ascii (Node Definition section)...