Techdocs Library > White papers > WebSphere z/OS - The Value of Co-Location

Document Author: Additional Author(s):	Don Bagwell Richard Ko, Michael Buechele, Mike Cox		Document ID:	WP101476
Doc. Organization:	Washington Systems Center		Document Revised:	11/12/2009
Product(s) covered:	WebSphere Application Server; WebSphere Process Server; z/OS

Abstract: One of the value propositions of WebSphere Application Server (WAS) for z/OS is the ability to collocate the application layer with the data layer in the same z/OS operating system instance. This leverages many of the inherent advantages of the System z hardware and z/OS operating system to be exploited to your business advantage. 1) Performance and Efficiency – co-location within the same z/OS operating system instance enables taking advantage of cross-memory data transfer, reducing overall request latency, improving overall throughput and reducing overall CPU utilization through the elimination of network traffic handling. We offer benchmark support of this under “Performance Studies”. 2) Operational benefits – co-location within the same z/OS operating system instance allows for things such as a the assertion of security identity, maintaining the same thread of execution, and being able to manage within a single Work Load Manager (WLM) classification. The purpose of this document is to provide validation and support for those two categories of value statements. The objective is to document and explain several advantages of co-location to enable customers to better arrive at the proper decision as to the best architecture to suit their needs.

Classification:	Software	Category:	Performance
Solution(s):	SOA Infrastructure
Platform(s):	IBM System z Family	S/W Pillar(s):	WebSphere
O/S:	z/OS	Keywords:	WebSphere z/OS, co-location, performance, Type 2, Type 4, zAAP, offload