The scenario is as follows, it is necessary to replicate the configuration WAS Solaris to AIX, the version is the same, there is only change of operating system, I need orientanción about what would be the best strategy, the best pratices or even if there is some tool as WASPreUpgrade and WASPreUpgrade that could speed up the deployment configuration.

Best regards

Your post does not specify which version or edition of WebSphere Application Server you are using, so I am going to assume your using WAS Network Deployment v8.5. My recommendation is to review the information in the WebSphere Application Server Knowledge Center on Migration.  The WAS ND 8.5 Knowledge Center - Migrating, Coexistance, and Interoperating has many articles that can give you a good overview of what is involved. Moving a WAS profile from one machine to another (even when the operating system changes) should be rather straight forward task. The article I recommend reading is for this task is Migrating to WAS 8.5 on a remote machine, where remote simply means that 2 machines are involved in the migration (in your case Solaris and AIX). Similar articles are available for other versions of WAS too.

When you install WAS, a configuration migration wizard also gets installed. The Configuration Migration Wizard is basically a graphical UI for the preupgrade and postupgrade CLI tools. This wizard might help you get through the migration faster. 

There are also several application Migration Tools available on developerWorks, but they are not likely to apply to your scenario of migrating from one Operating System to another using the same version of WAS on both machines.  These tools are more appropriate in situations where you are migrating from a non-IBM application server to WAS, or if you are migrating your applications from an earlier version of WAS up to a newer version of WAS, where the SDK level or other supported features changed between releases. 

The idea is move from WebSphere Application Server ND v6.1 v7 and v8 to same version but different Operative Sistem, in this case Solaris to AIX . I'll review the links that you share with me and I'll share my comments

For keeping the same version across platforms.. See the following as a reference document to help you move the configuration. Key points to remember is that, The new server needs to have WebSphere Application Server installed, but it won’t need to have any profiles created, although there is one preparatory item that will make your transfer go smoothly: the directory structure on the target system should match the directory structure on the source system. 

Any part of your configuration outside the WebSphere Application Server profiles (for example, any applications expanded in non-default locations, shared library JARs, database drivers used in JDBC providers, standalone connector modules, and so on) must be manually copied. Additionally, you will want to also make sure that any unique JVM settings is also moved or corrected for the new OS as needed. Hope this helps.

http://www.ibm.com/developerworks/websphere/techjournal/0905_webcon/0905_webcon.html

I'll review the link that you share with me and I'll share my comments