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Oracle RAC releated question, Private IP v/s Public IP

 
Mike_305
Super Advisor

Oracle RAC releated question, Private IP v/s Public IP

Hello,

Not sure if this is the right place for this question and if it's not then I apologize.

The question I have is do we absolutely need one private IP and one public IP for Oracle RAC install. What I have heard from other SA that has deal with this issue is has to have the private IP and public IP to get this install done.

Can someone tell me if this is requirement on hp-ux11.23 and if I have two public IP then the set will or will not work?

Appreciate your help in advance.

Thanks
If there is problem then don't think as problem, think as opportunity.
6 REPLIES
Hein van den Heuvel
Honored Contributor

Re: Oracle RAC releated question, Private IP v/s Public IP


Yes, the requirement for one private IP and one public IP for Oracle is critical, and is strictly an Oracle requirement.
It does not mater whether you are on HPUX, AIX, OpenVMS, Linux, or whatever.

To understand the details, be sure to check the Oracle documentations and forums. It is all well documented and explained.


Hein.
Steven E. Protter
Exalted Contributor

Re: Oracle RAC releated question, Private IP v/s Public IP

Shalom,

RAC is designed to let you run two instances of the oracle database on two machines accessing a single database, which sits on some kind of shared storage.

To run RAC in active-active mode, and try and split your traffic between two servers, to load balance and such, you nee two public ip addresses on your network.

To run in active-passive mode, you need only 1 IP address public, which will float to whichever node is active.

SEP
Steven E Protter
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Mike_305
Super Advisor

Re: Oracle RAC releated question, Private IP v/s Public IP

Hello,

Do you do or do not need private IP for RAC install that is my question. Networking group is not happy on giving private IP out.

Thanks,

M
If there is problem then don't think as problem, think as opportunity.
Hein van den Heuvel
Honored Contributor

Re: Oracle RAC releated question, Private IP v/s Public IP

The private IP is the most critical.
It is where the inter-node cluster communication will happen.

You may want to go beyond private address to entirely private network, de-coupled form teh corporate backbone on its own gigabit or better switch with JUMBO FRAMES enabled.

In my home lab I have 3 networks:
1 - 'public' to the clients
2 - 'private' just between the servers
3 - 'control' to the management processors and such.

Just google for "RAC VIP requitement +site:oracle.com"

You'll find references like below.

Hein.

http://download.oracle.com/docs/cd/B28359_01/install.111/b28250/prewin.htm#CHDEBGHB


2.7.1 Network Hardware Requirements

Each node in the cluster must meet the following requirements:

Each node must have at least two network adapters; one for the public network interface and one for the private network interface (the interconnect).

The private and public private network connection names must be different from each other and cannot contain any multibyte language characters. The names are case-sensitive.

The private network connection name must be the same on all nodes.

The public network connection name must be the same on all nodes.

The public interface on each node must be listed first in the bind order (the order in which network services access the node).

Oracle supports the TCP/IP protocol for the public and private networks

Windows Media Sensing must be disabled for the private network connection by setting the value of the DisableDHCPMediaSense parameter to 1.

2.7.2 IP Address Requirements

Sani
Frequent Advisor

Re: Oracle RAC releated question, Private IP v/s Public IP

Hi ,

Yes there should be seperate public and private ips(Networks).Through public ip ,out side world will connect to the database instance.private ip used for "Inter instance communication".


<<>

Yes it should work.But inter instance traffic should not be disturbed by some other traffic .So dedicate the ip for only that purpose.

Mike_305
Super Advisor

Re: Oracle RAC releated question, Private IP v/s Public IP

Thanks for your help. Appreciate very much.
If there is problem then don't think as problem, think as opportunity.