RE: Question re IP address mapping in a RAC environment

Finn,  

I believe that is in fact what it is. I am just looking for a discussion or documentation on the architecture of this process. I sort of understand how it works but I'm not sure and am looking for an explanation.  

Thanks.  

Bill Wagman
Univ. of California at Davis
IET Campus Data Center
wjwagman_at_ucdavis.edu
(530) 754-6208  

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Finn Jorgensen Sent: Thursday, February 21, 2008 5:28 PM To: William Wagman
Cc: oracle-l_at_freelists.org
Subject: Re: Question re IP address mapping in a RAC environment

Wouldn't that be the VIP of node 2 that's migrated to node 1?  

Finn

On Thu, Feb 21, 2008 at 5:38 PM, William Wagman <wjwagman_at_ucdavis.edu> wrote:

        Greetings,         

        Below is the output from ifconfig -a on one node of a two node RAC
        cluster running Oracle 10.2.0.3.0 EE on RHEL4. I just noticed something

        interesting today. If node 2 of the cluster is down there will appear an

        entry for eth0:2 with IP address for that node, see below. This makes

        sense to me, sort of, in that connections from node 2 must be redirected

        to node 2 and when node 2 comes back up the entry for eth0:2 no longer

        appears. My question, where can I find an explanation/documentation of

        what is occurring here and how it functions? I guess this is what the

        CRS is supposed to be doing, I'm just looking for more detail.         

        Thanks.         

        Both nodes up ----------         

	eth0      Link encap:Ethernet  HWaddr 00:11:43:EB:C7:8C
	         inet addr:128.120.45.32 <http://128.120.45.32/>
Bcast:128.120.45.127 <http://128.120.45.127/> 
	Mask:255.255.255.128 <http://255.255.255.128/> 
	         inet6 addr: fe80::211:43ff:feeb:c78c/64 Scope:Link
	         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
	         RX packets:1157 errors:0 dropped:0 overruns:0 frame:0
	         TX packets:5437 errors:0 dropped:0 overruns:0 carrier:0
	         collisions:0 txqueuelen:1000
	         RX bytes:122271 (119.4 KiB)  TX bytes:619958 (605.4
KiB)
	         Interrupt:233
	
	eth0:1    Link encap:Ethernet  HWaddr 00:11:43:EB:C7:8C
	         inet addr:128.120.45.33 <http://128.120.45.33/>
Bcast:128.120.45.127 <http://128.120.45.127/> 
	Mask:255.255.255.128 <http://255.255.255.128/> 
	         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
	         Interrupt:233
	
	eth1      Link encap:Ethernet  HWaddr 00:11:43:EB:C7:8D
	         inet addr:192.168.10.156 <http://192.168.10.156/>
Bcast:192.168.10.255 <http://192.168.10.255/> 
	Mask:255.255.255.0 <http://255.255.255.0/> 
	         inet6 addr: fe80::211:43ff:feeb:c78d/64 Scope:Link
	         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
	         RX packets:65825 errors:0 dropped:0 overruns:0 frame:0
	         TX packets:23028 errors:0 dropped:0 overruns:0
carrier:0
	         collisions:0 txqueuelen:1000
	         RX bytes:70736721 (67.4 MiB)  TX bytes:10977844 (10.4
MiB)
	         Interrupt:50
	
	Added when node 2 unavailable ---------
	
	eth0:2    Link encap:Ethernet  HWaddr 00:0F:1F:69:6B:A1
	         inet addr:128.120.45.31 <http://128.120.45.31/>
Bcast:128.120.45.127 <http://128.120.45.127/> 
	Mask:255.255.255.128 <http://255.255.255.128/> 
	         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
	         Interrupt:233
	
	Bill Wagman
	Univ. of California at Davis
	IET Campus Data Center
	wjwagman_at_ucdavis.edu
	(530) 754-6208
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