where can i configure extra dispatchers in cognos?

[bvk.cognoise]

Hi,

we have installed cognos on distributed environment.i installed gateway,dispatcher, content store on different systems.now i we are planing to configure two more dispatcher  to my environment.

>now my question is where can i configure my two dispatcher in my cognos environment either in gateway or in dispatcher?
>how can i make those dispatchers starts automatically when my first dispatcher fails to work?
>what are the settings i need to do?

please help it is very urgent?


thanks
bvk

[SIM0N]

When you install your additional Dispatchers, you configure the Content Manager URI - this should be your existing Content Manager.  When then start up, they will register themselves with the CM and you should see them in the Admin Console.

[AussiePete2011]

Also dont forget to add them to the gateway if you've installed a separate gateway as this will be how the load balancing of the dispatchers take place.

I believe there are a number of tech notes and documents floating around in IBM for this type of work.
Have a look at the IBM Cognos Proven practices site

FOr technotes, dont bother with the IBM search engine, its easier to use google with the following key words
IBM Cognos "8.4" distributed dispatcher
You can chop and change the last word, like Install, or application and you'll get a fair amount of information on this topic.

Hope this helps
Cheers
Peter B

[bvk.cognoise]

Hi all,

thank you very much for your information.it helps me a lot. :D

thank you
bvk

[SIM0N]

Also dont forget to add them to the gateway if you've installed a separate gateway as this will be how the load balancing of the dispatchers take place.

Yes, you should do this , but I believe this will give you failover protection NOT load balancing.

[venkys4u_]

Yes, you should do this , but I believe this will give you failover protection NOT load balancing.

Hi ,
Am not sure about load balancing... I guess load balancing is increasing  dispatcher's processing weightage?? Am i right?

thanks for ur time
venky

[smiley]

Cognos dispatchers use passive loadbalancing logic.
ie they devide the load themselves, using the x amount of reports requests that's configured.
Default install set's it to 2 processes (bibusses), which each can handle 4 report requests (low affinity requests)

You can change this value in the dispatchers tuning section if you have more powerfull hardware then 2 cpu's and 4 gig memory, or have very small reports of which you can up the concurrency more. 

[venkys4u_]

Cognos dispatchers use passive loadbalancing logic.
ie they devide the load themselves, using the x amount of reports requests that's configured.
Default install set's it to 2 processes (bibusses), which each can handle 4 report requests (low affinity requests)

You can change this value in the dispatchers tuning section if you have more powerfull hardware then 2 cpu's and 4 gig memory, or have very small reports of which you can up the concurrency more.

I refered my previous post based on the following link..
http://public.dhe.ibm.com/software/dw/dm/cognos/infrastructure/cognos_specific/ibm_cognos8_failover_and_load_balancing.pdf

i feel im clear with failover dispatcher configuration(I guess failover dispatcher is having extra dispatcher like one is active and the other one is stand by and in this case only one dispacther be in active state.. Please correct me if I am wong..
)  But seeking info about how to have additional active cognos dispatcher that operates concurrent at same time and how they share processing reports..  Is it like having two different cognos connection url with same cognos content store? are thier load shared based on processing capacity in tuning section??

Thanks in advance
venky

[smiley]

Dispatchers are always active. It's the Content manager servlet that has an active and a standby construction.
Inside the tomcat java stack, you have 2 servlets running. A dispatcher servlet (application server), and a content manager servlet (content manager).
They can be seperated during install if needed. During install, they refer to the naming convention i used in the previous line in brackets.

When an end user starts a report, the gateway sends the request to the first dispatcher in it's configuration.
That dispatcher sends the request to the active content manager.
The active content manager decides (after authentication and authorisation) where the report should be executed, based on the passive load balancing rules it has.   

This is all a bit confusing if you only have 1 or 2 servers, that do it all.
Have a look in the installation and configuration guide that comes with the install of BI.
You should find samples of various confiugration possibilities, and pictures to make them clear.

[instmaniac]

Is this the same used for Cognos 10. or anything more i suppose have to do ?

Thanks in advance..:) :)

[RobsWalker68]

Hi,

The architecture with regard to dispatchers is the same as Cognos 8, although the load balancing is a bit more intelligent in Cognos 10

Rgds

Rob

[nsaxena]

Hi All,

I was following this blog and have few questions related to same topic.

We are migrating to new server(cloud server) for cognos. In that case how many dispatchers should i ask for?
Also on same server can we have more than one dispatcher? if yes how?

I was referring to this blog :-
http://public.dhe.ibm.com/software/dw/dm/cognos/infrastructure/cognos_specific/ibm_cognos8_failover_and_load_balancing.pdf
here the second dispatcher is on another server.