Hi,

  What are the steps need to take care for migration of Websphere Application Server from Unix to Linux OS? Provide related articles about it.

  Details related to Migration of IBM IHS Server from Unix to Linux?
   
  

IBM has a tool called Rational Automation Framework that can duplicate / automate all the WAS Configuration.

In short, you point it to the enviournment you want to duplicate, and it will read it, and then point it to  the new location and it creates a duplicate env. there.

here is a link for that tool:

www-01.ibm.com/software/rational/product...

I hope this is helpful.

Take Care,

Mohammad

Hi,

   Thanks for the information....

   Whether it is designed for helping on IBM products migration alone or not? As of related documents didn't get enough information on it.

   I'm looking on migration of OS (HP-UX) to linux

To my understanding RAFW migrates IBM WebSphere, and not the whole OS.

IBM services team can migrate the whole OS.  Ask your IBM Sales representative for such services; I am not aware of products that does complete OS migration.

Help me understand... You want to go from HP-UX or AIX to what flavor of linux?  RedHat or SuSe?  Are you going from ND to Hyperviser too?

Any flavor of unix to another unix is not going to be that hard most (but not all) are supported for WAS.  Can you bullet out the transition points? I can give you the steps to make it work.

Thanks Rene for your reply...

Below are little more clear details;

From AIX to  Linux.

 It is an Red hat Linux.

Migrating Application Resources on each cluster from current AIX to Linux environment. Deploy Application to Linux Environment

The cleanest apprach would be to do a fresh websphere install on Linux and then deploy your applications onto the new environment.  That way your deploying the WAR/EAR onto a clean setup.  You can also try a backupConfig in WAS on the old environment and try restoring that config onto the new linux install.  That would give you your configs, cell, apps etc.  But be careful you'd have to do the dmgr and the nodes.  Now I have not tried this in the lab but I was told it may work.  I'll see if I can get further detail for you with some scripts and commands you can try.

Here is how it should be planned

 

Step1: Checklists

• - Most important is a checklist of the tasks to be done in each level


• - Check the operating systems levels and connfirm that they are as per websphere installation requirements


• - Check if there are any websphere related file changes [names, custom properties etc..] from AIX to Linux


• - The service levels of websphere on both AIX and RHEL should be same [fixpacks]


• - Notedown all the node names, server names etc .. from the AIX machine


• - Create ports def inition file for each profile on the AIX machine.

Step2: on AIX machine

• - Take a backup of the configuration when all the servers, nodeagents are stopped on the AIX machine.  [backup config]


• - BackupConfig doesn't include all the necessary files. Like SSL keyrign files [was_home/etc] and was_home/property directory [these are related to security configurations]


• - SI bus configurations are also not backed up using above command.

Step3: on RHEL machine

• - The path of was_root,profile_root on RHEL should be same as that of AIX.


• - On RHEL machine create the required nodes, servers with the same names as of the old machine.


• - Remember to use the portdef file created above [so that port number will be same]


• - Stop all nodeagents and servers


• - Restore the configuration taken on the old machine. [restoreConfig]


• - Replace the other directories mentioned above also.


• - Remove all the old logfiles, transaction logs etc..

Step4: Renaming

• - use the scripts on this page to change the host names etc.. [www.ibm.com/developerworks/websphere/lib...]


• - do a grep on all the files under was_profiles/config and modify if any files has still reference to old hostnames, nodenames etc..

Step5: Validation.

• - Start the nodeagnets and servers


• - Check the applications.

Step6: GWC

• - After completion, write your feedback/experience on GWC :-)