Load balancing multiple J2ee servers - each running it's own CI

Is it possible to load balance multiple J2ee servers(running Portal), both running it's own Central Instance?
We do not have the resources (SAN storage) to implement MSCS for Portal...so instead we want to use two complete Portal servers HW load balanced with the ability to keep running in case one fails.
thanks for any info !
Linwood

Hi Linwood,
in a nutshell, the difference between an ordinary J2EE server instance and the central instance are the central services. The central services (enqueue server, message server) are only needed once. Basically, they are required for the communication between the server instances (and to the load balancer). What you should go for is a cluster installation with one central instance and another ordinary server instance (both running the SAP NetWeaver Portal). But be aware that you have to use the same database for both server instances (otherwise you cannot guarantee consistent data).
For load balancing the two server you can use the SAP Web Dispatcher or any other load balancer tool you like.
You will find more and detailed information on load balancing in the SAP Library. Have a look into section <a href="http://help.sap.com/saphelp_nw2004s/helpdata/en/2e/611724f410254ca12a3f396ec5ae85/frameset.htm">Java Cluster Architecture</a>.
Hope I could help!
Best regards,
Martin

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fortunately the cookie are different on the 2 servers otherwise this feature would not work.
The value you enter after the keyword cookie-passive is a 'name' and can be whatever you want (you can also leave it blank/empty).
The LD will learn the cookie directly from the server.
See the documentation at :
http://www.cisco.com/univercd/cc/td/doc/product/iaabu/localdir/ldv42/421guide/42ch05.htm#xtocid8565101
I hope this answer your question.
Gilles.

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Does anyone have a recommended network, hardware and software configuration guide for a Portal installation running with multiple gateways load balanced (ie one URL) that talk to multiple servers?

David,
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on this one.
David Broeren wrote:
Recommended configuration for load balanced Portal with load balancer,
multiple gateways and multiple servers.
Does anyone have a recommended network, hardware and software
configuration guide for a Portal installation running with multiple
gateways load balanced (ie one URL) that talk to multiple servers?
Try our New Web Based Forum at http://softwareforum.sun.com
Includes Access to our Product Knowledge Base!

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Thanks,
Dave
serverfarm host application
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probe server-80-PROBE
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probe server-80-PROBE
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replicate sticky
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Sean,
Maybe a little confused.
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Solution load Balancing for two Servers run Sun One Web Server 7.0

Hi All ,
I must configure load balancing web server for two server . Could you tell me Solution ?
Please help
Thanks .

The following should help you configure Web Server to reverse proxy (load balance) to your two backend servers.
[http://blogs.sun.com/amit/entry/setting_up_a_reverse_proxy|http://blogs.sun.com/amit/entry/setting_up_a_reverse_proxy]

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Hi,
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you listed the only 2 options available.
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Thanks for rating this answer.

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Hello,
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Running Multiple OC4J Instances From a Single Install of 9iAS 1.0.2.2
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Pooja,
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I want to load balance SSO middle tier servers and have them access a single SSO database. When you install infrastructure and select SSO only it creates a new infrastructure database. How can I install multiple SSO servers and point them to a single database. I am doing Load Balancing with F5 and read an Oracle WP where they mentioned an Oracle supported configuration where they load balanced SSO servers with F5.
KB

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Personally solution 1 is the best method. We are using F5 Big-IP with this configuration and it is working great.
Hope this helps!

CSS10500 Load Balancing Multiple Hosts

Hello,
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int e1-RTR1-------->int e2-Host1
-------->int e3-Host2
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Sorry for all the fuss i am new to the CSS concept.

Let's start with the basic
http://www.cisco.com/en/US/products/hw/contnetw/ps792/products_configuration_example09186a008009438d.shtml
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Verify that you can ping the CSS from the router and the server.
Gilles.

Load balancing for CORBA servers not happening

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James

Hi James,
As I believe the whitepaper Ed pointed to you probably explained, what you are likely seeing is normal behavior for load balancing. Assuming that you aren't dealing with issues associated with active objects and that requests to active objects are going to be sent to the server where the object is active, then you seeing normal behavior.
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Regards,
Todd Little
BEA Tuxedo Chief Architect

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ACE module not load balancing across two servers

We are seeing an issue in a context on one of our load balancers where an application doesn't appear to be load balancing correctly across the two real servers. At various times the application team is seeing active connections on only one real server. They see no connection attempts on the other server. The ACE sees both servers as up and active within the serverfarm. However, a show serverfarm confirms that the load balancer sees current connections only going to one of the servers. The issue is fixed by restarting the application on the server that is not receiving any connections. However, it reappears again. And which server experiences the issue moves back and forth between the two real servers, so it is not limited to just one of the servers.
The application vendor wants to know why the load balancer is periodically not sending traffic to one of the servers. I'm kind of curious myself. Does anyone have some tips on where we can look next to isolate the cause?
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Here are the show serverfarm statistics as of today:
ACE# show serverfarm farma-8000
serverfarm     : farma-8000, type: HOST
total rservers : 2
                                                ----------connections-----------
       real                  weight state        current    total      failures
   ---+---------------------+------+------------+----------+----------+---------
   rserver: server#1
       x.x.x.20:8000      8      OPERATIONAL 0          186617     3839
   rserver: server#2
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Regards,
Yuji

Using a single CSS to load balance multiple services

Is it possible to use a single CSS to load balance 3 different services (server farm) ? That mean the CSS need to advertise 3 VIP
I'm thinking of two scenarios:
1 - configure the CSS to use 4 interfaces: 1 to public, 3 to private (each interface will plug-in to a different vlan/server farm)
2 - configure the CSS to use 2 interfaces: 1 to public, 1 to private (all 3 server farms are in the same vlan)
Will both scenarios work ?
Thanks
--Phillip.

Hi Phillip,
both scenarios will work. One CSS can certainly manage more than 3 services! You can even use just one VIP for all traffic, then just create the proper rules to send specific traffic to the corresponding service(s). No need for 3 VIPs.
Regards
-juerg

Load balancing multiple J2ee servers - each running it's own CI

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