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Old 12-02-2010, 12:21 PM   #1
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Registered: Jul 2008
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RAC Cluster (Redhat) NIC information


Trying to build a RAC server. I have 5 ips that the Network Team has provided with. They are like this:

LAN IP (IP & Cable, which means physical card is present)
TSM IP (Tivoli Storage Manager-Backup) (IP & Cable)
ISO1 (Heartbeat 1) (IP & Cable)
ISO2 (Heartbeat 2) (IP & Cable)
iLO & (HP Integrated Light-Outs for remote console) (IP & Cable)
vip (IP Only)

So I thought I could check the ips of all the nics with ifconfig. But when I do

#ifconfig -a

I see only the eth0 (LAN) and eth1 (TSM) ips, eth2 and eth3 are empty. I don't see any other information. I have learnt that, I need to configure ISO1 and ISO2 for the NIC cards, but don't know which NICs to configure.

There is an already built RAC server which confused me because that has the following information:

Existing RAC server
#ifconfig -a

eth0: has the ip0, gateway1, Mask1 and h/w id as say(64:12:13:14:15)

eth0:1 has the ip1, gateway1, Mask1 and h/w id SAME AS eth0 as say(64:12:13:14:15)
eth0:2 has the ip2, gateway1, Mask1 and h/w id SAME AS eth0 as say(64:12:13:14:15)

eth1: ip3, gateway2, mask2

eth2: ip4, gateway3, mask3

eth3: ip5, gateway4, mask3 (same as eth2's mask)

sit0 Link encap: IPv6-in-IPv4 (does not have any ips assigned)

My Questions:

1. What does it mean by eth0:1, eth0:2, are these virtual ips, if so how do we configure them ( I might need commands (thanks in advance) as this is my first time and also are IPs related to ISO1 & ISO2?)

2. When I check the /etc/sysconfig-scripts/ directory, I did not find the eth0:1 and eth0:2, how do I find them?

3. How do I know what NICs in the existing RAC server are associated to the Heartbeat ips as I don't have the existing server's specification, I only have the new server's specs which I need to build), is it ok if I configure the ISO1 and ISO2 ips with eth2 and eth3?

4.If I want to make my RAC server look similar to this one, then what should I do? I mean any additional pre-reqs that you might think of?

Thank you in advance. Sorry if there are too many questions, but I am very eager to build these boxes as this is my first time.

Please Help
Old 12-02-2010, 05:02 PM   #2
Registered: Jun 2001
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1. These are interface aliases (not vlans, which would be eth0.1 and eth0.2, but you didn't ask about vlans...). They are nothing more than a simple way to have multiple IP addresses on the same bog standard interface. You'd configure them using...

2. it's /etc/sysconfig/network-scripts/ifcfg-ethX so no wonder you couldn't find them. You should also be able to use system-config-network to get a gui (x windows or console based) to modify them. TBH off hand I can't remember the exact name the files for an aliased interface will be, I remember getting stuffed with special characters before, but if ifcfg-eth0:1 does exist, then that's your man.

3. Well I guess you need to find someone who does... no?

4. Clone the disk I guess is the easiest way, if the machine is otherwise identical the only thing you'd need to do is change the hostname, ip's and MAC addresses *if* the macs are listed in the ifcfg files. Outside of that there are a huge number of variables, and oracle and RAC are not trivial things.
Old 12-02-2010, 08:36 PM   #3
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Registered: Jul 2008
Posts: 23

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Found a little info about RAC NICs


Thank you very much for the information. So, What I found after a little research is all the NICs' configuration is specified in the /etc/hosts file. So I checked all the ips assigned to the NICs using ifconfig -a and compared each one to the ones in the /etc/hosts file of the same server (I would call it as ss84ora20) and everything matches including the ISO1(eth2) and ISO2(eth3).

The eth0:1 is being assigned an ip address (vip) for that server and is caled as ss84ora20-vip(say) and eth0:2 belongs to scan ips it seems. So the Network guy gave me information about this eth0:2 which is called as SCAN and there are three scan ips that they gave me and all of them having the same ips (say 10.692.62.1) and their fqdn is somewhat like, its like same fqdn and ips repeated 3times.

So these ips are binded (I dn't know whether I am using the right terminology or not?) and are assigned to this eth0:2 as a single ip.

However, I learnt that, the RAC team configures these things, but there is a possiblity that they might ask me to do it too.

So, again, as I cannot use the gui here, and if I understood your information properly, I can create it like this right:

# ifconfig eth0.1 (assuming, I am in the network-scripts directory) and then give the ip as specified & gateway, mask same as eth0's gateway and mask and save it. If so, when I type ifconfig -a, then should I be able to see the o/p like this:




I will also try to figure out through my search. But if you or anyone knows, please update my raw brain to a volume brain (vb00)

Thank you in advance s


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