Hi everyone! I have to install HA

[risc6k]

Hi everyone!
I have to install HACMP in S85 system(AIX V4.3.3_ML_07).
so i need someone advice to configuration HACMP
My question is
1. when i configuration tcpip, svc_adapter(serverA) to stby_adapter(serverB) can ping each other?
2. If it is, I have to registered in routing table?
thanks & regards

 

[edg]

Not knowing your exact environment, I can only comment on our HA setup. I have a two node rotating cluster so that one of the systems is always idle. When HA is started, the service address is activated in place of the boot address of the current primary system. The addressing has the service and boot addresses on one subnet, and the standby adapters on a different subnet. I am able to ping between all of the adapters, and I did not have to enter any routing entries. I put in the default gateway addresses when configuring the adapters and the routers and firewalls took care of everything else. Hope this helps.

 

[Guest_imported]

The short answer is: boy are you in trouble.

The longer and more helpful answer is that your service and standby adapters should NOT be able to ping one another. Both should be on different subnets, but part of the same physical network. That is, assuming a netmask of 255.255.255.0:

service_a 50.50.50.1
standby_a 50.50.55.1

service_b 50.50.50.2
standby_b 50.50.55.2

Here, the service adapters can ping one another, and the standbys can too, but the services cannot reach the standbys.

Of course, if you want IPAT (IP Address Takeover) where the IP address will move from one machine to another, you will need a boot address also:

boot_a 50.50.50.101
boot_b 50.50.50.102

I say you are in trouble because administering HACMP requires expert-level knowledge of TCP/IP and LVM. Find every book that IBM makes on HACMP and read it.

Good luck.

 

[edg]

Sorry, I don't seem to be the expert that gusbear is. But I'm not sure if I agree with the explanation of ping between the adapters. My understanding is that the reasoning behind putting standbys on a different subnet is that by default a ping from a standby on the same subnet will return on the service adapter. So for troubleshooting purposes, you put the standbys on a different subnet to make the ping return on it. If you stick a router on the network, you can make it so that all of the adapters can ping each other. However, I think that HACMP plays by its own rules. So as I have found, in a two node cluster, if one standby adapter loses connection to the network, the other standby adapter loses the ability within the cluster to prove that it is alive, and so it goes into a failed state. I'm sure that gusbear will correct me if I am wrong.

 

[gileb]

Hello to all,

Yes svc and stby adapters must be on a different subnet, and no, if you loose one stby adapter, the other one on the other server is not lost. for example if you loose one standby adapter the other node still can swap from svc to stby on the same node ...
The even which comes up in case of a standby adapter down is limited to the adapter itself and not the entire standby network.

 

[risc6k]

Hi dear!
thanks for your advice. It's really helpful to me.

 

[absi]

hi all
while taking advantage of hacmp discussion on this forum
which i think that i have not seen much i have some quries
also
1.Do any one of our friends on this forum have cascading config hotstandby.
i have two rgs each with its own svc address.Both have to be
taken over by standby node in case of node1 failure.
My questions are as :
is this config correct?
Node1---
svc1 stby1 boot1
145.17.16.1 145.17.18.1 145.17.16.200
svc2 stby2 boot2
145.17.16.2 145.17.18.2 145.17.16.202

Node2------
I really confuse for this node??
how many adapters it will need?
how many boot and standby adapters
any need for svs adapter or not

can any body help me????
Absi

 

[gileb]

Well thats an interesting question;
Are all you adapters (svc) in the same network (in hacmp point of vue)?
I would say that you need 2 stby adapter in your backup node, and only one other adapter that would be svc but not in any rg and no boot address.