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HomeHomeUsing DNN Platf...Using DNN Platf...Administration ...Administration ...Load balancing with DNN4.8Load balancing with DNN4.8
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2/19/2008 7:00 AM
 

Hello all,

We have a big client that want to run traffic and user heavy portal on DNN. On their colocation we have configured 2 webservers in NLB and 2 SQL servers.

NLB cluster is with 3 NICs, and running in unicast with affinity of single IP address. It is working perfectly. Also i have made realtime two way replication/syncronisation between 2 webservers home directorys. It has been tested and working perfectly also.Any file that is changed (copy, move, delete or else) is in same second replicated to other server.

SQL is 2005 Standard. For begining i have configured it with database mirroring. So second database is synced and mirrored in second SQL server and witness can initialise automatic failover. For start and testing i have rulled out witness so failover is done manualy.

When i had everything tested i started installation of DNN 4.8 on one node. Everything also went ok. SQL is used on just one node. After install is over i tryed website on other node, it was also working. And last test is try cluster host, and there is working also. Did simple tests doing administration on first node (adding text, pictures, articles) and it is shown in same second on other node and on cluster host.

So by this time i do not have a problem. I folowed webfarm document in documentation, but it is rather old. From version 3.x. So either document is explaining everything we need, or it is not updated :) I'm afraid that one thing is development environment, and other is live. In live situation i expect caching problems that i read so much about it in forums, blogs, etc.etc.

But my question is how did you people do this kind of environment? How did you do NLB cluster of Web server? How did you do SQL cluster/mirror? I'm also interested in load balance with SQL 2005. That thing is not supported by default, but there is table partitioning, there is p2p replication and those kind of things. So how did you do it? Was there ID conflict on mergeing of databases (in case of p2p replication)? Any kind of information is helpful here.

Thx in advance.

 
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2/27/2008 6:26 AM
 

No answers here just more questions....

I run a large application as DNN 4.8.0 modules in an Intranet environment.  My current setup is to use hardware load balancer with sticky session, connect to 3 webservers with identical website directory connecting to a single SQL Server 2000 database.

The application is complex and consumes a lot of cpu and memory resources. Currently about 20 active users per webserver. I need the load balanced environment to make sure I can scale quickly with more webservers to accomodate new users.

Almost all website content is generated from the database. File synchronisation of DNN root  is not necessary for this setup.

I am very satisfied with this setup except for one aspect:

I have implemented my own HTTP_Authenticate  method in combination with IIS windows authentication.  The network credentials of the users are then reused to automatically login to the DNN portal and my custom application. I keep getting HTTP 401.2 and 401.1 errors on requests from users. I suspect this is due to the network load balancer but am not completely sure.  Users are unaware of the errors because somehow IIS authenticates the user correctly and gives HTTP 200.

Perhaps I am being over cautious and the IIS eventlog errors are warnings...

My questions are:

- anyone have a solution for NLB and IIS Windows authentication errors?

-are there other ways to setup multiple webservers for DNN in combination with single signon situations?

Cheers, Evert

 
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