Load Balancing didn't work (version 4.20.959)!! BUG?

There are two Windows 2003 Application Server.
Both are available in the Hostlist for the Application.
When i start the application and one of the server is not available i get the following message in the Connection Progress window
Starting the application...
Connecting to Protocol Engine...
Launch failed on 10.193.24.255; trying the next third-tier host
No i only can cancel the session.
The appliaction is not reachable.

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Oracle Applications 11i Load Balancing does not work with RAC one Node

Hi all,
Could you help me to resolve this issue.
Architecture environment is :
- One APPS tier node
- Two nodes Oracle Database Appliance (Primary node 1 holds INSTANCE_1 et Secondary node is configurured to holds INSTANCE_2), i.e RAC one Node.
- The primary node have instance_name SIGM_1 and the secondary node have instance_name SIGM_2, but in RAC one node, the secondary instance is not alive.
We convert our EBS 11i environment to RAC following note ID Using Oracle 11g Release 2 Real Application Clusters with Oracle E-Business Suite Release 11i [ID 823586.1].
When testing Database failover, Oracle Applications 11i load balancing does not work anymore.
The root cause is that, when the primary node of the Rac one node is down, the INSTANCE_NAME_1 is automaically relocating to the surviving node,.
During test failover, we imagine that when the primary node goes down, the secondary node start or relocate database with instance_name SIGM_2, and in that case the Oracle Applications load balancing works.
Currently, when the primary node goes down, the instance_name SIGM_1 is relocated on the secondary node, which cause failure of Oracle Applications Load Balancing.
Thank you for your advice.
Moussa

This is something I observed a long time ago for Safari (ie: around version 1). I'm not sure this is Safari, per se, but OpenSSL that is responsible for the behavior. I'm pretty sure Chrome does this and I've seen some Linux browsers do it.
What I have done at the last two companies I've worked for is recommend that our clients do not use SSL SessionID as the way of tracking sticky sessions on web servers, but instead using IP address. This works in nearly all cases and has few downsides. The other solution is to use some sort of session sharing on your web servers to mitigate the issue (which also means that your web servers aren't a point of failure for your users' sessions). (One of the products I supported had no session information stored on the web servers, so we could safely round-robin requests, the other product could be implemented with a Session State Server... but in most cases we just used IP address to load balance with). The other solution is to configure your load balancer to terminate the SSL tunnel. You get some other benefits from this, such as allowing your load balancer to reduce the number of actual connections to the web servers. I've seen many devices setup this way.
One thing to consider through this is that - due to the way internet standards work - this really can't be termed a bug on anyone's part. There is no guarantee in the SSL/TLS standards that a client will return the same SSL Session ID for each request and there is not requirement that subsequent requests will even use the same tunnel. Remember, HTTP is a stateless protocol. Each request is considered a new request by the web server and everything else is just trickery to try and get it to work the way you want. You can be annoyed at Safari's behavior, but it's been this way for over 5 years by my count, so I don't expect it to change.

RFC Sender (XI 3.0, SP14) Load Balancing doesn't work

Hi all,
We're "desperately" trying to use the Load Balancing option of RFC Sender Adapter (XI 3.0, SP14). It doesn't work.
The Adapter can not register to the sender SAP server. But when we do not use the "Load Balancing" option, everything works well.
We did follow the XI guidelines step-by-step. All necessary configurations in XI and in SAP sender system (TA: SM59) are "properly" done and reviewed by different experts several times.
Do you have, by chance any running scenario using "Load Balancing" within a RFC Adapter? If yes, I would appreciate if you can share it with me.
Thanks a lot!
Regards,
Khaled

Hello Khaled,
the RFC sender adapter registers a program at the SAP Gateway. Load Balancing for the Sender Adapter means, that you have at least two J2EE server nodes within your XI installation. On all these server nodes the same RFC sender adapter is started and register the same program at the same gateway. The load balancing is then handled by the gateway. That means, that for the sender adapter the settings are the same, even if you use load balancing or not.
The settings are, e.g.
- SID=ABC
- hostname=abchost (central instance, message server)
- hostname=xyzhost (additional dialog instance of ABC)
- instance nr=00
application server (gateway): xi1host
application server service (gw-service): sapgw00
programm id: could be freely choosen
The Metadata Repository could be connected using load balancing. Here a user need to log on to the system.
The settings here must be:
Message-Server: abchost
Message-Server-Service: sapmsABC
System-ID: ABC
Logon-Group: e.g. PUBLIC; this logon group need to be created in system ABC using transaction SMLG
For the RFC-Receiver Adapter the same settings as for the Metadata could be used.
Keep in mind, that for the RFC Sender Adapter a RFC connection of type T must be created in transaction SM59 in system ABC.
Rgds.,
Andreas

Load balancing doesn't work

I'm using iAS 9.0.2.2.1
I need to establish 2 form servers for Load Balancing.
I have done all the things written in the document,
but it seem doesn't work !
I need extra information for establishing Load balancing
in form server , is there anyone could help me !
Thanx in advance
Kamran Bakhshandeh

Hi,
the server version you give is Oracle9iAS Release 2, but the Forms release is Forms 6i as is in Oracle9iAS Release 1 (9.0.1.x). Actually these wont work together. Also, the Forms 6i metrics server used for loadbalancing does not work with Servlets but the Forms listener. Loadbalancing with Forms6i is documented in the Whitepaper for patch 10 (http://otn.oracle.com/products/forms/pdf/p10listenerservlet.pdf).
The load balancing in Oracle9iAS Release 2 Forms Services is done with mod_oc4j.
Frank

MPLS TE equal or unequal load balancing doesn't work? - step2

Previous question in thread:
Dear Sir!
I've two MPLS TE tunnels from one PE to another PE.
And there are traffic share count between them
(as tunnel mpls traffic-eng load-share command define).
But in real life all traffic from the same source to the same destination go through only one tunnel
(as CEF define - i.e. how sh ip cef exact-route says).
PEs are 3660 platforms with c3660-jk9o3s-mz.123-8.T
installed.
How can I correct this problem?
But this answer does not solved my issue:
hritter - Network Consulting Engineer, CISCO SYSTEMS, CCIE
Aug 4, 2004, 7:20am PST
This is expected behavior since CEF is used at the head end to perform label imposition. I wouldn't recommend changing the default bahavior to per=packet loadsharing since this could lead to of of sequence packets, which could lower the overall performance.
Hope this helps,
so my secound question:
Dear Sir!
I'm agree with you as MPLS TE tunnels are opened from PE to PE, so CEF does it work.
But if I open this tunnels from P to PE, ONLY ONE of this tunnels are used instead of load-sharing, if traffic go from one source (of site1 of VPN1) to the same destination (located at site2 of VPN1).
Why? Packet through P-devices swithes by labels, so I mean that CEF cannot does src-dst load sharing?
My problem are that I must to do load sharing between this two tunnels in the case above.
Q: How can I solve this problem?
Best regards,
Maxim Denisov

The per session load-balancing is also used by MPLS when multiple paths are available. Changing this behavior to per-packet is still not recommended.
Hope this helps,

Round-robin Load balancing doesn't work after one instance reboot

Hi,
          We have two weblogic instances in a cluster. All Http requests are routed through the plug-in for load-balancing(round-robin). One instance in a cluster is shutdown for production maintenance. Now all requests are being forwarded to the second instance. When the first instance is started, only the new users are forwarded to the first instance. The requests from users already logged in are not forwarded to the first instance. Due to this the second instance is over-loaded.
          How to prevent this and make weblogic to distribute the load even after the server restart? This is a production problem and I highly appreciate your responses.
          Thanks,
          Prasad Dantuluri

it worked when I removed the value entered in the "Unicast Broadcast Channel" and restarted the cluster. Don't know what is supposed to go in that field but hey.

Accessing individual server in load-balanced cluster not working as expected

We have a cluster set up with multiple managed servers and hardware load
          balancers sitting in front to direct traffic. We have the frontend host
          configured to be the dns name of the single URL for the cluster, which maps
          to the IP address that the load balancers balance. When accessing part of
          our site (a WebLogic portal) at
          http://server1/portalApp/appmanager/portal/desktop
          (where server1 is the name of one of the managed servers)
          the portal performs a redirect to the login page at
          /portalApp/appmanager/portal/desktop?_nfbp=true&_pageLabel=login_page.
          The URL that results in the browser is not what I would expect, which would be
          http://server1/portalApp/...
          Instead, it is
          http://cluster/portalApp/...
          where cluster is the frontend host setting. Is there any way to avoid
          this, so we can perform directed testing on specific managed servers?
          Thanks,
          Andy


Hi Maria, thanks for your help! I wrote a simple test jsp that does a
          redirect if a parameter is set, otherwise it doesn't do anything. When I
          accessed the jsp at server1/app/test.jsp?a=true, something (I assume
          either WebLogic or the load balancer) rewrote the URL after the redirect
          (the redirect was to /app/test.jsp). The URL that appears in the browser
          after the redirect is cluster/app/test.jsp. Do you know if this happens
          because of WebLogic or the load balancer? Our load balancers are Cisco
          11503's I believe.
          Do you think it would make any difference if I leave the frontend host
          for the cluster to be the dns name of the cluster, and then if I set the
          frontend host for each server to be the dns name of that specific server?
          Currently each server does not have any value entered for frontend host.
          Thanks!
          Andy
          Maria Carcedo <[email protected]> wrote in
          news:31424665.1108079763742.JavaMail.root@jserv5:
          > Hi Andy!
          >
          > We had basically the same problem and we fixed it by configuring the
          > F5 load balancer to maintain the session with whichever server it
          > started the connection with. We had to enable cookie persistence, more
          > specifically the Active HTTP Cookie, with Method insert (do not enter
          > any expiration or anything else in any other field other than what is
          > already there when the page loads -> F5 bug).
          >
          > So if the original request from the portal goes to server1, every
          > subsequent request will go to server1 as well. The next session
          > request will go to server2 and every subsequent request within that
          > session will go to server 2, and so on (assuming you have round
          > robin).
          >
          > I hope this helps!
          >
          > Maria

How does load-balancing with WebCache work - is there still a bottleneck?

Hello,
We're migrating an old Forms 6i app to 10.1.2.0.2 (apps servers = Redhat Linux), and are starting to consider using WebCache to loadbalance between two application servers.
My question is this - say we have apps servers A and B, both running Forms and Reports Services. We use Webcache on server A (don't have the luxury of a third apps server...) to load balance between A and B. So all initial requests come into A, which in some cases may then be diverted to start a new Forms session on B.
For those users whose middle-tier sessions are now running on B - will all network traffic for their Forms session continue to be routed through Webcache on A, then to B, over the course of the session? Or does Webcache somehow shunt the whole connection to be straight between the client PC and server B, for the duration of that Forms session?
If the former, does that mean that the server hosting Webcache can still be a significant bottleneck for network traffic? Have people found load-balancing with Webcache to be useful..?
Thanks in advance,
James

Hi gudnyc,
Thanks for posting on Adobe forums.
For HDPI you do not have to do any It will adjust automatically.
http://helpx.adobe.com/photoshop-elements/using/whats-new.html
Regards,
Sandeep

Load balancing is not working correctly during server fail-over

Hi,
          We have 4 weblogic instances in a cluster with proxy-plugin load balancing the requests. When instance 1 is shutdown, all the subsequent requests from users whose sessions were at instance1 are sent over to instance2 only. They are not divided between instance2, instance3 and instance4.
          Can somebody, please, tell if there is any solution to this so that sessions for users who were being redirected to instance1 will be divided between instances 2,3 and 4.
          Thanks,
          Prasad

It is not possible because in a cluster server1 always chooses the same secondary server (with some algorithm)
          So all sessions with primaries on server1 will have secondaries on same secondary server.
          So if primary is down, all the requests(that has primaries on server1) will be routed to the same secondary server.
          -Vijay

Sharepoint 2013 SP1 incoming email in load balanced farm not working on both servers

I have 2 SharePoint 2013 WFE servers with a VIP load balancer.
I have configured the basic scenario incoming email on both servers as per this article
http://technet.microsoft.com/en-ca/library/cc262947(v=office.15).aspx.
The email makes it to both WFEs in the SMTP drop folder but SharePoint picks it up always from one smtp server.
What could go wrong? is there any additional configuration needed so that sharepoint check both servers?

MX records can be pointing to the IPs of your Incoming Email SharePoint servers. They should have the same weight if you want them to load balance, or different weights if you want them to be failover.
Trevor Seward
Follow or contact me at...
&nbsp&nbsp
This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

MPLS TE equal or unequal load balancing doesn't work?

Dear Sir!
I've two MPLS TE tunnels from one PE to another PE.
And there are traffic share count between them
(as tunnel mpls traffic-eng load-share command define).
But in real life all traffic from the same source to the same destination go through only one tunnel
(as CEF define - i.e. how sh ip cef exact-route says).
PEs are 3660 platforms with c3660-jk9o3s-mz.123-8.T
installed.
How can I correct this problem?
Best regards,
Maxim Denisov

Dear Sir!
I'm agree with you as MPLS TE tunnels are opened from PE to PE, so CEF does it work.
But if I open this tunnels from P to PE, ONLY ONE of this tunnels are used instead of load-sharing, if traffic go from one source (of site1 of VPN1) to the same destination (located at site2 of VPN1).
Why? Packet through P-devices swithes by labels, so I mean that CEF cannot does src-dst load sharing?
My problem are that I must to do load sharing between this two tunnels in the case above.
Q: How can I solve this problem?
Best regards,
Maxim Denisov

Jdbc urls and when does load balancing and failover work?

I you use a jdbc url with OracleDriver not OracleDataSource because we use dbcp for our connection pooling. What can we expect by putting in two connection descriptors one for each host when an 11g RAC node goes away?
I know all about ONS and FCF etc but when you are not using OracleDataSource and friends what benefit is there is having mulitple hosts in the jdbc url?
What is that recognises the other host in the jdbc url when a RAC node goes away? Is that integral to OracleDataSource or anything outside of OracleDriver?
right now we only have one HOST = in your jdbc url but I'm not sure how we would benefit by adding the second if we are not using OracleDataSource.

Best I can suggest - step up and become the expert.
You are dealing with RAC which most people do not have and do not use (based on postings I have seen) so you already have that advantage.
The dbcp pool doesn't mean anything since it just acts as a wrapper around the Oracle driver.

JDBC load balancing with non RAC replicated instances

Hi,
The thin JDBC load balancing feature only works with RAC clusters or it can be used with two non RAC replicated instances using the same service name?
Thanks,
Ezio.

Thank you Douglas for your time.
I assumed the first case (database connection load balancing). I thought that the listener would do the load balancing and failover trick. So, I configured the JDBC connection as follow:
String MM_loadBalance1_DRIVER = "oracle.jdbc.driver.OracleDriver";
String MM_loadBalance1_USERNAME = "scott";
String MM_loadBalance1_PASSWORD = "tiger";
String MM_loadBalance1_STRING = "jdbc:oracle:thin:@(DESCRIPTION=" +
" (LOAD_BALANCE=on) (FAILOVER=on)"+
" (ADDRESS_LIST="+
" (ADDRESS=(PROTOCOL=TCP)(HOST=test1) (PORT=1521))"+
" (ADDRESS=(PROTOCOL=TCP)(HOST=test2)(PORT=1521)))"+
" (CONNECT_DATA=(SERVICE_NAME=test)))";
Driver DriverRecordset1 = (Driver)Class.forName(MM_loadBalance1_DRIVER).newInstance();
Connection ConnRecordset1 = DriverManager.getConnection(MM_loadBalance1_STRING,MM_loadBalance1_USERNAME,MM_loadBalance1_PASSWORD);
But, when one of the instances was down (test1), the connection failed, it didn't failed over to the other instance (test2).
So I wondered if it failed due to some misconfiguration issue or because it only works with RAC instances...

Siebel Testing. Cookie handling, cookie load balancing and authentication.

We are delivering a PoC in a big Siebel customer and we are finding some issues.
Environment information is:
- Siebel testing, version 8.
- NTLM Windows authentication.
     When we create a Siebel Load script, recording works fine. Replaying the script, after adding the Authentication function, does not work
     When we create a Web Load Script with the same structure and business process, after adding the Authentication function, it works.
     Looking at the difference between Web and Siebel scripts, only difference are a couple of cookies that Web script considers and Siebel does not. This two cookies are added in the second call of the NTLM handshake requests (two requests with 401 http code and a final with a 200 http code). The application, in the first NTLM handshake request, ask the browser to add a couple of cookies that the browser (and OLT in a web load script) add. Siebel load script does not add/handle this cookies.
     Accordingly, the script works with web module but does not work with Siebel module.
Right now we only have two options to make Siebel work:
- Change the DNS address to point to a single node for the application, instead of pointing to the load balancing service. This way, cookies are not needed and the script does not fail.
- Add the cookies by hand. This way, cookie content is "hardcoded" and, so, it will not be useful for load balancing purposes, which lead us to previous bullet. Load testing using Siebel will not work load balanced.
I added a web script (works fine with no tweaking) and a Siebel script executed with normal configuration (does not work) and workaround (avoiding the load balancing cookies- it works).
Many thanks for the help,
Iván.
IM_Siebel_Second_Test.zip
Siebel web test.zip
Edited by: user9982485 on 03-Aug-2010 09:18

Álex,
Thank you a lot, I will call you related to other issue also. Thanks for the kind help!.
IMHO, it works or not depending on cookies added for load balancing. Siebel module does not specifically add these cookies, while web module does. If you delete the cookies from the web module, it stops working, so I guess the cookies are making/breaking the script.
I will send you the scripts, so you can have a look.
Thanks,
Iván.

Home Interface Load Balancing with user transactions

Hi
          Im running the following Client scenario:
          * gets initial context
          * lookup for Home Interface.
          * save the Home Interface.
          * Begin User Transaction
          * Home.findByPrimaryKey(pk)
          * activate some business method
          * Commit transaction.
          * close context
          now repeat but use the saved home interface
          * gets initial context
          * get saved Home Interface.
          * Begin User Transaction
          * Home.findByPrimaryKey(pk)
          * activate some business method
          * Commit transaction.
          * close context
          It seems that once i use the Home finder under a transaction the home
          interface will stick to the first server and load balancing won't work
          (doesn't matter if its round-robin or random).
          that means that in both cases the EjbObject i use is on the same server.
          please correct me if im wrong.
          but if im right is this a weblogic bug? or maybe a feature?
          thanks
          Dror Last


You will find that most engineers at BEA strong recommend NOT using UserTxns, unless you've got some
          complex nest transaction modeling that can't be done with BMT.
          From your case, it looks as if you should use a Session-bean facade between your servlets and entity
          beans; this way you set the session bean BMT attribute to whatever you wanted using
          UserTransaction; try this out and see what happens with load-balancing... we use BMT in clustered
          servers and load-balancing works great.
          Gene
          "Dror Last" <[email protected]> wrote in message news:[email protected]...
          > Im using Weblogic 5.1 / SP8
          >
          > <home-is-clusterable> set to TRUE on all beans.....
          >
          >
          > I have a big Question Mark if weblogic clustering does have load balancing
          > while the client (Servlet Engine in my case) Uses User Transactions.
          >
          > thanks
          > Dror Last
          >
          >
          > "Gene Chuang" <[email protected]> wrote in message
          > news:[email protected]...
          > > What WL version are u using, and what do you have <home-is-clusterable>
          > set to?
          > >
          > > Gene
          > >
          > > "Dror Last" <[email protected]> wrote in message
          > news:[email protected]...
          > > > Hi
          > > >
          > > > Im running the following Client scenario:
          > > >
          > > > * gets initial context
          > > > * lookup for Home Interface.
          > > > * save the Home Interface.
          > > > * Begin User Transaction
          > > > * Home.findByPrimaryKey(pk)
          > > > * activate some business method
          > > > * Commit transaction.
          > > > * close context
          > > >
          > > > now repeat but use the saved home interface
          > > >
          > > > * gets initial context
          > > > * get saved Home Interface.
          > > > * Begin User Transaction
          > > > * Home.findByPrimaryKey(pk)
          > > > * activate some business method
          > > > * Commit transaction.
          > > > * close context
          > > >
          > > > It seems that once i use the Home finder under a transaction the home
          > > > interface will stick to the first server and load balancing won't work
          > > > (doesn't matter if its round-robin or random).
          > > >
          > > > that means that in both cases the EjbObject i use is on the same server.
          > > >
          > > > please correct me if im wrong.
          > > >
          > > > but if im right is this a weblogic bug? or maybe a feature?
          > > >
          > > > thanks
          > > > Dror Last
          > > >
          > > >
          > >
          > >
          >
          >

Load Balancing didn't work (version 4.20.959)!! BUG?

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