How does Tuxedo 10.0 load balance across the BRIDGE?

Is the load balancing round robin or does work done factored in?

Yes and no. In all honesty, see if this white paper helps answer your question: http://www.oracle.com/technetwork/middleware/tuxedo/overview/ld-balc-in-oracle-tux-atmi-apps-1721269.pdf
Regards,
Todd Little
Oracle Tuxedo Chief Architect

Similar Messages

How does IronPort assist in load balancing?

There are plans to put a load balancer in front of an IronPort cluster of 6. As of now, we have Mx record priority (Round robin) based load balancing.
Does an ESA has the intelligence to automatically reject incoming connections if other ESAs in the cluster is idol? Or, in other way, does ESA has the intelligence to reject incoming connections if it sees a series of connection attempts from the same source? Or, does it have intelligence to reject incoming connections if it is devoid of any resource to process any new messages?
Thanks,
Chandan

No. The ESA will still act in the same stand alone fashion - so, it will act independently with the traffic that is presented. Other appliances in cluster would not recognize the other appliance's traffic or status for handling mail that is processed --- remember, with the ESA, in cluster - the only thing that is shared is the configuration between cluster appliances.
The traffic handling and load balancing aspect would be based on the 3rd party software/appliance sitting in front of the appliances --- then control the pool of appliances that you have set from there.
I hope this helps!
-Robert
(*If you have received the answer to your original question, and found this helpful/correct - please mark the question as answered, and be sure to leave a rating to reflect!)

How can I debug Aggressive Load Balancing on the WLC ?

Hello Cisco-Experts,
I'm looking for the command on the Cisco WLC to debug Aggressive Load-Balancing.
There is a nice document, ID 107457 describing this feature, but it lacks the command.
Please investigate and help me and maybe improve YOur documentations.
Thanks in advance
Winfried

Hello NetPros,
I have disabled now "Agressive Load Balancing" now on the WLC. To my surprise, still Load-balancing packets are received from our HREAP-APs via a WAN-Link on the central WLC.
Here is an example:
Tue Jan 13 15:35:59 2009: 00:1c:bf:4a:3f:2e LBS data stored for Mobile 00:1c:bf:4a:3f:2e from AP 00:23:5d:0e:e9:e0(0) new saved RS
SI (A -128, B -53), SNR 41, inUse 1, [rcvd RSSI (A -128, B -54), SNR 40]
Tue Jan 13 15:35:59 2009: 00:1c:bf:4a:3f:2e LBS data rcvd for Mobile 00:1c:bf:4a:3f:2e from AP 00:23:5d:0e:e9:e0(0) with RSSI (A -
128, B -55), SNR 42
Tue Jan 13 15:35:59 2009: 00:1c:bf:4a:3f:2e LBS data stored for Mobile 00:1c:bf:4a:3f:2e from AP 00:23:5d:0e:e9:e0(0) new saved RS
SI (A -128, B -54), SNR 41, inUse 1, [rcvd RSSI (A -128, B -55), SNR 42]
It is remarkable that the MAC-addresses of many of the WLAN-clients do not belong to our company and packets are send via a WAN-link.
Why do I see these packets while load-balancing is disabled ?
How is this working ?
Thank You for any explanation.
Winfried

Load balancing across multiple machines

I am looking for assistance in configuring Tuxedo to perform load balancing across
multiple machines. I have successfully performed load balancing for a service
across different servers hosted on one machine but not to another server that's
hosted on a different machine.
Any assistance in this matter is greatly appreciated.

Hello, Christina.
Load balancing with multiple machines is a little bit different than
in the same machine. One of the important resource in this kind
of application is network bandwidth, so tuxedo tries to keep the
traffic among the machines as low as possible. So, it only
balance the load (call services in other machine) in case all the
services are busy in the machine where they are call.
I mean, if you have workstation clients attached only to one
machine, then tuxedo will call services in this machine untill
all servers are busy.
If you want load balancing, try to put one WSL in each machine,
and the corresponding configuration in your WSC ( with the | to
make tuxedo randomly choose one or the other) or spread your
native clients among all the machines.
And so, be carefull with the routing!
Ramón Gordillo
"Christina" <[email protected]> wrote:
>
I am looking for assistance in configuring Tuxedo to perform load balancing
across
multiple machines. I have successfully performed load balancing for a
service
across different servers hosted on one machine but not to another server
that's
hosted on a different machine.
Any assistance in this matter is greatly appreciated.

Load balancing across database connection

Do you provide load balancing across database connections and allow RDBMS load
balancing for read only access?
Thanks in advance.

Hello, Christina.
Load balancing with multiple machines is a little bit different than
in the same machine. One of the important resource in this kind
of application is network bandwidth, so tuxedo tries to keep the
traffic among the machines as low as possible. So, it only
balance the load (call services in other machine) in case all the
services are busy in the machine where they are call.
I mean, if you have workstation clients attached only to one
machine, then tuxedo will call services in this machine untill
all servers are busy.
If you want load balancing, try to put one WSL in each machine,
and the corresponding configuration in your WSC ( with the | to
make tuxedo randomly choose one or the other) or spread your
native clients among all the machines.
And so, be carefull with the routing!
Ramón Gordillo
"Christina" <[email protected]> wrote:
>
I am looking for assistance in configuring Tuxedo to perform load balancing
across
multiple machines. I have successfully performed load balancing for a
service
across different servers hosted on one machine but not to another server
that's
hosted on a different machine.
Any assistance in this matter is greatly appreciated.

Load balancing from the BI portal

Hi everybody,
We have a BW system with two application servers.
When we use BEx, the load balancing leads the user to the application server that is used less.
When we use the portal, everything goes over the central server.
Does anybody know how we can set up load balancing from the BI portal ?
Kind regards,
Marc van Eijndt

The web dispatcher for your portal should do the load balancing... usually the scenario is the other way round - BEX tends to use the server irrespective of its load and Portal will hit the load balancer and hence lead to better performance ....

ACE30 load balancing across two slightly different rservers

Hi,
is there a possibility to get a load balancing across two rservers so:
when client sends http://vip/ and it goes to rserver1 then url is sent without change
when client sends http://vip/ and it goes to rserver2 then url is modified to http://vip/xyz/
Or maybe load balancing can be done across two serverfarms ?
thanks

Ryszard,
I hope you are doing great.
I do not think that´s possible since the ACE just load balance the traffic to the servers and once the load balance decision has been taken it will pass the "ball" to the chosen server.
Think about this, let´s say user A needs to go to Server1 but guess what? based on the load balance decision it was sent to Server2 which unfortunately does not have what the customer was looking for. OK, fine, user A close the connection and tries again but now the Server1 is down then the only available is Server2 then the ACE sends it to Server2 again then user A just decides to leave, you see how bad that can be.
A better approach would be to have either 2 VIPs ( different IP addresses) or 2 with the same IP address but hearing on another port, perhaps, one port per server.
Hope this helps!
Jorge

Load balancing across DMZs - Revisited

I know this question has been asked before and the answer is to have separate content switches per DMZ in order to maintain the security policy. There is an option to have the content switch in front of the firewall and then use only one content switch to load balance across multiple DMZs. Is this an acceptable design or the recommendation is to have a separate content switch behind the firewall for each DMZ of the firewall?
Can a Cisco 6500 with CSM be configured for multiple layer 2 load balanced VLANs thus achieving a mutiple DMZ load balancing scenario with only one switch/CSM?

How do you connect the router to the firewall ?
Problem is the response from the server to a client on the internet.
Traffic needs to get back to the CSS and if the firewall default gateway is the router, the response will not go to the CSS and the CSS will reset it.
If you configure the default gateway of the firewall to be the CSS, than all traffic from your network to the outside will go through the CSS.
This could be a concern as well.
If you don't need to know the ip address of the client for your reporting, you can enable client nat on the CSS to guarantee that server response is sent to the css without having the firewall default gateway pointing at the CSS.
Gilles.

Load balancing across 4 web servers in same datacentre - advice please

Hi All
Im looking for some advice please
The apps team have asked me about load balancing across some servers but im not that well up on it for applications
Basically we have 4 apache web servers with about 2000 clients connecting to them, they would like to load balance connections to all these servers, they all need the same DNS name etc.
what load balancing methods would I need for this, I believe they run on Linux
Would I need some sort of device, or can the servers run some software that can do this, how would it work? and how would load balancing be achieved here?
cheers

Carl,
What you have mentioned sounds very straightforward then everything should go well.
The ACE is a load balancer which takes a load balancing decisions based on different matching methods like matching virtual address, url, source address, etc then once the load balance decision has been taken then the ACE will load balance the traffic based on the load balance method which you have configured (if you do not configure anything then it will use the default which is "round robin"), then it will send the traffic to the servers which it has available and finally the client should get the content.
If you want to get some details about the load balancing methods here you have them:
http://www.cisco.com/en/US/docs/app_ntwk_services/data_center_app_services/ace_appliances/vA3_1_0/configuration/slb/guide/overview.html#wp1000976
For ACE deployments the most common designs are the following.
Bridge Mode
One Arm Mode
Routed Mode
Here you have a link for Bridge Mode and a sample for that:
http://docwiki.cisco.com/wiki/Basic_Load_Balancing_Using_Bridged_Mode_on_the_Cisco_Application_Control_Engine_Configuration_Example
Here you have a link for One Arm Mode and a sample for that:
http://docwiki.cisco.com/wiki/Basic_Load_Balancing_Using_One_Arm_Mode_with_Source_NAT_on_the_Cisco_Application_Control_Engine_Configuration_Example
Here you have a link for Routed Mode and a sample for that:
http://docwiki.cisco.com/wiki/Basic_Load_Balancing_Using_Routed_Mode_on_the_Cisco_Application_Control_Engine_Configuration_Example
Then as you could see in all those links you may end up having a configuration like this:
interface vlan 40
description "Default gateway of real servers"
ip address 192.168.1.1 255.255.255.0
service-policy input remote-access
no shutdown
ip route 0.0.0.0 0.0.0.0 172.16.1.1
class-map match-all slb-vip
2 match virtual-address 172.16.1.100 any
policy-map multi-match client-vips
class slb-vip
    loadbalance vip inservice
    loadbalance policy slb
policy-map type loadbalance http first-match slb
class class-default
    serverfarm web
serverfarm host web
rserver lnx1
    inservice
rserver lnx2
    inservice
rserver lnx3
    inservice
rserver host lnx1
ip address 192.168.1.11
inservice
rserver host lnx2
ip address 192.168.1.12
inservice
rserver host lnx3
ip address 192.168.1.13
inservice
Please mark it if it answered you question then other users can use it as reference in the future.
Hope this helps!
Jorge

Web Dispatcher not doing the load balancing on the portal

Hi Experts
I am having a production issue where the SAP web dispatcher is not doing the load balancing on the portal.
We have ESS/MSS portal with 1 Message server and 2 Application servers. The Web dispatcher is installed on the message server itself. Here is my Web disp profile file
Profile generated by sapwebdisp bootstrap
unique instance number
SAPSYSTEM = 16
add default directory settings
DIR_EXECUTABLE = .
DIR_EXECUTABLE = F:\usr\sap\<SID>\sapwebdisp
DIR_INSTANCE = .
Accessibility of Message Servers
rdisp/mshost = <hostname>.com
ms/http_port = 8111
#Log and Trace
rdisp/TRACE = 2
SAP Web Dispatcher Parameter
wdisp/auto_refresh = 120
wdisp/max_servers = 100
wdisp/shm_attach_mode = 6
configuration as per SAP note 538405
icm/max_conn      = 7000
icm/max_sockets   = 14000
icm/req_queue_len = 6000
icm/min_threads   = 100
icm/max_threads   = 300
mpi/total_size_MB = 500
mpi/max_pipes       = 14000
wdisp/HTTPS/max_pooled_con = 7000
SAP Web Dispatcher Ports
icm/server_port_0 = PROT=HTTP,PORT=8888
SSL
icm/server_port_1 = PROT=ROUTER,PORT=443, TIMEOUT=60
SAP Web Dispatcher Web Administration
icm/HTTP/admin_0 = PREFIX=/sap/wdisp/admin,DOCROOT=./admin,AUTHFILE=icmauth.txt
wdisp/enable_j2ee_groups = TRUE
wdisp/HTTPS/sticky_mask = 255.255.255.255
In my Web dispatcher Admin page, I see all the three application servers, however the requests are going to only 1 App server. We are using ENd to End SSL configuration for the web dispatcher.
We also have a reverse proxy in the landscape and reverse proxy is forwarding all the requests to the Web dispatcher. In Web disp Admin page>Dispatching Module>SSL End to END dispatching, I see only ONE table entry in the dispatching table and it is our Reverse Proxy.
As all the requests are coming from only one source (Reverse proxy), it seems to me that the sap web dispatcher is forwarding those to the same Application server every time.
Can anyone please advise ?
I also tried to configure logon group in NWA, the web dispatcher is detecting the logon group and all the app servers in the logon group. It still not doing the load balancing.
I would greatly appreciate any help.
Thanks
Viny

Vincent, can you please elaborate more ? Is the web dispatcher not able to recognize stateful and stateless application requests ?
I saw that the procedure for configuring SSL Termination on Web dispatcher is long and complicated and looks like SAP web dispatcher needs to have SSL certificate of its own. As we have no ABAP servers and only Java servers, I can not even create the PSEs using STRUST (as described in SAP help -http://help.sap.com/saphelp_nw70ehp1/helpdata/en/48/99c388d7c46bb9e10000000a42189d/frameset.htm
We already have SSL certificates for Java App servers.
I suppose there should be a way for web dispatcher to identify the incoming requests and forward to appropriate application servers.
Any help is much appreciated.
Thanks
Viny

Load balancing across multiple paths to Internet

Hello,
I have a 2821 router. Currently, I have two bonded T-1 circuits to the Internet.
I would like to add a DSL circuit to augment the T1s. I would also like to load balance across all of the circuits. Currently, IOS performs inherent load balancing for the T1 circuits. The DSL circuit is from a different provider than the T1s.
The T1s are coming from a local ISP that runs no routing protocols within their infrastructure. (They run static routes and rely on the upstream provider for BGP.) The DSL provider is a national telecom carrier.
What is the best way to perform load balancing for this scenario?

Here is the answer (sort of) for anyone reading this post with the same question:
No matter which way I choose to do it, the trick is to have the local ISP subnet advertised via BGP through both pipes. The national telecom DSL provider will not advertise a /20 subnet down a DSL pipe. (Ahh, why not? =:)
Had the secondary pipe been a T-1,T-3, or other traditional pipe, I could have used a load balancer like a BigIP, or FatPipe device or possibly CEF within the IOS.
Case closed. Thanks to everyone that took a look.
Doug.

IPTV load balancing across broadcast servers.

I know that across Archive servers in the same cluster that IPTV control server will load balance , is there is a similar function with Broadcast servers. I know broadcast servers use a different delivery mechanism (Multicast). We have multiple broadcast servers that take in an identical live stream, but the only way to advertise thru a URL is a seperate URL per server. Is there some way to hide the multiple URL's to the client population?

No. There is no way to load balance across multiple broadcast servers for live streams. Since this is going to be multicast, there should not be any additional load on the servers when the number of users are more.

Sticky load balancing across 2 ports with cookies

Hi,
I have a server configuration where I have 1 top level Apache server that deals with SSL termination (and handles static content) and proxy passes dynamic content onto 2 Tomcat servers on 2 ports, one for http requests (9001) and one for the requests that were secure, but have now been un-encrypted by Apache (9002). My 2 Tomcat servers are load balanced using a CSS and I need this load balancing to stick to the tomcat servers regardless of port so that the user is stuck to the same Tomcat server for their entire session.
I would like to use arrowpoint cookies to perform this stickyness, but the documentation suggests that arrowpoint cookie load balancing (in fact any cookie based load balancing) requires the port to be specified in the content rule. Is this correct? Is my only option to use the source IP for stickyness? I don't understand why the port should be required if the stickyness is via a cookie. Can I not simply configure my 2 tomcat servers as services with no port and add a single content rule that load balances these services using arrowpoint-cookie advanced balancing?
service tomcat1
ip address x.x.x.x
active
service tomcat2
ip address x.x.x.x
active
owner me
   content sticky
     vip address x.x.x.x
     protocol tcp
     url "/*"
     add service tomcat-1
     add service tomcat-2
     advanced-balance arrowpoint-cookie
     active

Angela-
The issue with port is that cookies are very specifically HTTP only and the CSS has no way of knowing what protocol will hit a VIP prior to trying to address it as HTTP. Your issue is actually a bit clearer than it is initially led to be - you can still use 2 different rules by using the configuration below.
However, you might be headed for a headache if you don't implicitly control the client's actions. By default, browsers don't generally send cookies cross-protocol and definitely not cross-domain. Use something like httpwatch or iewatch to check out the headers your client sends to your site. Make sure when the 200ok arrives with the set-cookie that the client sends that cookie in all preceeding packets that are HTTP and HTTPS both.
service tomcat1
string "tomcat1"
ip address x.x.x.x
active
service tomcat2
string "tomcat2"
ip address x.x.x.x
active
owner me
   content sticky9001
     vip address x.x.x.x
     protocol tcp
     url "/*"
     port 9001
     add service tomcat-1
     add service tomcat-2
     advanced-balance arrowpoint-cookie
     active
   content sticky9002
     vip address x.x.x.x
     protocol tcp
     url "/*"
     port 9002
     add service tomcat-1
     add service tomcat-2
     advanced-balance arrowpoint-cookie
     active
With this configuration, the CSS will use the "string" as the cookie value. So if the client were to recieve set-cookie: ArrowpointCookie=tomcat1, it should use it for either rule, and end up on tomcat1 accessing either VIP.
Regards,
Chris

Cache and Load Balancing for the Oracle APEX Listener

Hi,
I intend to use only HTTP access.
My database is Oracle 11gR2, SE, 32 bit.
How to implement a Cache and Load Balancing with the Oracle APEX Listener?
Is it possible to do with the the standalone running APEX Listener?
Thanks by advance for any tips/documentation/references.
Kind Regards.

Error. To be closed.

Load balancing by the proxy plugin

Has anyone encountered this before:
I have a cluster of two WLS 5.1 servers, hosting servlets that serve web
requests. The requests are proxied through a web server ( I have tried
Weblogic, Apache as well as IIS). I also have a tool that simulates
concurrent web requests and fires them to the proxy server.
As per documentation, as the load balancing while proxying requests to
servlets is round robin, I expect that the requests are uniformly
distributed across the two weblogic servers. But what I see is a bit
different. In one case I fired 15 requests and found that 11 went to first
server and 4 went to the other.
Second time when I fired again 2 of them went to the first server and 13 to
the second one. I would expect that around half of the total requests
should be routed to each server everytime so that there is a proper load
balancing done by the proxy. I have not changed any configuration related
to the default load balancing algorithm. So I expect it is round-robin.
Has anyone encountered this before ? This happens to me irrespective of
which proxy server I use (i.e which proxy plugin I use). Is there some
other configuration required and I am missing something or is there some
inherent problem with the load balancing of the proxy plugins. Any info
would be highly appreciated.
Thanks
Mainak

Could you post this in weblogic.developer.interest.plug-in? This group is for
ejb related questions. Thanks.
Bill
Mainak Datta wrote:
Has anyone encountered this before:
I have a cluster of two WLS 5.1 servers, hosting servlets that serve web
requests. The requests are proxied through a web server ( I have tried
Weblogic, Apache as well as IIS). I also have a tool that simulates
concurrent web requests and fires them to the proxy server.
As per documentation, as the load balancing while proxying requests to
servlets is round robin, I expect that the requests are uniformly
distributed across the two weblogic servers. But what I see is a bit
different. In one case I fired 15 requests and found that 11 went to first
server and 4 went to the other.
Second time when I fired again 2 of them went to the first server and 13 to
the second one. I would expect that around half of the total requests
should be routed to each server everytime so that there is a proper load
balancing done by the proxy. I have not changed any configuration related
to the default load balancing algorithm. So I expect it is round-robin.
Has anyone encountered this before ? This happens to me irrespective of
which proxy server I use (i.e which proxy plugin I use). Is there some
other configuration required and I am missing something or is there some
inherent problem with the load balancing of the proxy plugins. Any info
would be highly appreciated.
Thanks
Mainak

How does Tuxedo 10.0 load balance across the BRIDGE?

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