Does JBoss Cluster on Two or More Databases?

[6tr6tr]

I have a question about the structure of a clustered JBoss setup. Can I cluster two JBoss App Servers, each with it's own Database (that are the same in structure/content)?

So like this:

JBoss Server 1 <-----| Clustered | ------> JBoss Server 2
| |
| |
V V
Database 1 Database 2


Or is it like this:

JBoss Server 1 <-----| Clustered | ------> JBoss Server 2
| |
| |
--------------------------------------------------------
|
|
V
Database 1


If so, why is it the second one and not the first?

[6tr6tr]

Sorry, the text all became left-aligned.

So like this:

JBoss Server 1 <-----| Clustered | ------> JBoss Server 2
 | |
 | |
 V V
 Database 1 Database 2


Or is it like this:

JBoss Server 1 <-----| Clustered | ------> JBoss Server 2
 | |
 | |
 ------------------------------------------------
 |
 |
 V
 Database 1


If so, why is it the second one and not the first?

[tsagovic]

I believe that the second setup is the right one (well I am quite sure it is the good choice) to keep ur DBs in sync. There should be one single DB from the JBoss app server point of view. IF the a single DB server can not scale then the database should be scaled. Most DB offer some kind of clustering capabilities, but with $£$ license. In case u r using open source DBs, I would suggest you to check Out ClusteredJDBC; It looks like a JDBC driver to ur app. but it has clustering capabilities.

http://c-jdbc.objectweb.org/ JDBC web site

Hope that helps.