RE: Question re IP address mapping in a RAC environment

  • From: "William Wagman" <wjwagman@xxxxxxxxxxx>
  • To: <finn.oracledba@xxxxxxxxx>
  • Date: Fri, 22 Feb 2008 08:19:12 -0800

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@xxxxxxxxxxx
(530) 754-6208 

 

________________________________

From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Finn Jorgensen
Sent: Thursday, February 21, 2008 5:28 PM
To: William Wagman
Cc: oracle-l@xxxxxxxxxxxxx
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@xxxxxxxxxxx>
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@xxxxxxxxxxx
        (530) 754-6208
        --
        //www.freelists.org/webpage/oracle-l
        
        
        


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