Re: Question re IP address mapping in a RAC environment

the eth0:2 is the Virtual IP for your rac connections. This is part of the nodeapps resource in the CRS. Without the VIP bouncing to another node, clients would be constraints by TCP timeouts before being redirected to another node.

On Thu, Feb 21, 2008 at 7:28 PM, Finn Jorgensen <finn.oracledba_at_gmail.com> wrote:

> 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 Bcast:128.120.45.127
> > Mask: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 Bcast:128.120.45.127
> > Mask: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 Bcast:192.168.10.255
> > Mask: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 Bcast:128.120.45.127
> > Mask: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
> > --
> > http://www.freelists.org/webpage/oracle-l
> >
> >
> >
>

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