Failover NIC for 2 subnets?

[Rudy Williams]

Hello--

I have two identically configured rp54370s with three NICs each. Two of the NICs (lan0 and lan2) are defined in cmcluster.ascii as heartbeat NICs and are on different subnets, of course. We will be running the heartbeat over production LANs--there is no private heartbeat network.

If the network infrastructure configuration will allow it, can the third NIC act as the failover for either of the other two?

cjw

[Hai Nguyen_1]

The answer is yes.

In this case, you have already had redundant HBs (2) of which one should serve as a primary data lan card (assume that it is lan2). You should configure lan1 as a standby lan for lan1 so you will have both redundant HBs and redundant data LANs.

Hai

[Stephen Doud]

Hi Christopher,

I agree with Hai,
As long as the two "primary" LANs are on the same physical network, and the unused LAN is on the same net and is the same type of LAN (ethernet, FDDI etc), it can act as a standby. Normally, cmquerycl will build a cluster configuration file that would show this relationship (except for making the second primary LAN a HB LAN).

-s.

[Hai Nguyen_1]

Sorry.

This:
You should configure lan1 as a standby lan for lan1...

should have been:
You should configure lan1 as a standby lan for lan2...

Hai

[Rudy Williams]

Folks--

Two of the NICs (lan0 and lan1) are 100 Base-T, lan2 is gigabit fiber.

If I understand what you are saying, lan1 can only be standby for lan0, right?


cjw

[Hai Nguyen_1]

FYI,

"Managing MC/ServiceGuard", March 2002, page 30 says:
NOTE: FibreChannel is no longer supported as a heartbeat or data LAN.

Therefore, in order to impelment MC/SG, your lan2 has to be switched back to 100 base-T.

Hai

[melvyn burnard · Accepted solution]

A Gigabit Fibre connection is NOT the same as Fibre Channel Networking.
So there is no reason why this cannot be done, provided you have the appropriate hardware (switch normally) to interconnect all the connections.
Word to the wise, ensure you are patched especially on networking and the SG patch for the SG version you are running