There's almost no limit to the number of cells you can build in a (Parallel) Sysplex. The resources used by a WAS for z/OS aren't trivial. You shouldn't create too many ND cells unless the cell-to-cell isolation is really needed.

WAS for z/OS V6.0.1 introduces a new HA manager. It provides a continuous availability solution for singleton services in WAS for z/OS. It complements the Parallel Sysplex's continuous availability solution. It works with all the topologies discussed so far.

Other Topologies
Under certain condition and configurations, WAS for z/OS V5.0.x, V5.1 and V6.0.1 can co-exist in the same cell.

• WAS for z/OS v5.0.x, and V5.1 nodes can co-exist in the same cell if and only if they are on different LPARs.
• WAS for z/OS V5.0.x and V5.1 nodes can co-exist in the same LPAR if and only if they are in different cells
• WAS for z/OS V5.0.x and V6.0.1 nodes can co-exist in the same cell if and only if they are on different LPARs.
• WAS for z/OS V5.0.x and V6.0.1 nodes can co-exist in the same LPAR if and only if they are in different cells.
• WAS for z/OS V5.1 and V6.0.1 nodes can co-exist on the same LPAR in the same or in different cells.

Conclusion
The WAS for z/OS topologies on a single LAPR is more suitable for development and testing. Should you need a highly scalable and continuously available environment, you should consider configuring ND cells across the LPARs in a (Parallel) Sysplex.

Unfortunately we don't have the space to discuss the edge components for a WAS for z/OS. If you're interested in edge components, please refer to the resources.

Should you need a step-by-step installation and configuration guide of WAS for z/OS, please refer to the resources.

Resources

• WAS for z/OS information center: http://publib.boulder.ibm.com/infocenter/ wasinfo/index.jsp?topic=/com.ibm.websphere.zseries.doc/info/welcome_zos.html

  http://publib.boulder.ibm.com/infocenter/ws51help/ index.jsp?topic=/com.ibm.websphere.zseries.doc/info/welcome_zos.html

  http://publib.boulder.ibm.com/infocenter/ws60help/ index.jsp?topic=/com.ibm.websphere.zseries.doc/info/welcome_nd.html

• Washington Systems Center Sample WebSphere for z/OS ND Configuration www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/WP100367
• WebSphere Application Server for z/OS V5 - Planning for Test, Production and Maintenance www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/WP100396
• WBSR6 - "Gen 6" workshop handouts www.03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/PRS1290