WebSphere Application Server V7.0: Concepts ... - IBM Redbooks

These features become more important at larger enterprises, where applications
tend to service a larger client base, and more elaborate performance and high
availability requirements are in place.
WebSphere Application Server Network Deployment Edge Components provide
high performance and high availability features. For example, the Load Balancer
(a software load balancer) provides horizontal scalability by dispatching HTTP
requests among several Web server or application server nodes supporting
various dispatching options and algorithms to assure high availability in high
volume environments. The usage of Edge Component Load Balancer can reduce
Web server congestion, increase content availability, and provide scaling ability
for the Web server.
WebSphere Application Server Network Deployment also includes a dynamic
cache service, which improves performance by caching the output of servlets,
commands, Web services, and JSP files. This cache can be replicated to the
other servers. The state of dynamic cache can be monitored with the cache
monitor application. For more information about WebSphere Application Server
Network Deployment V7.0, see the following Web page:
http://www.ibm.com/software/webservers/appserv/was/network/
1.3.5 WebSphere Application Server for z/OS V7.0
IBM WebSphere Application Server for z/OS is a full-function version of
WebSphere Application Server Network Deployment. While it offers all the
options and functions common to WebSphere Application Server V7.0 on
distributed platforms, it enhances the product in a variety of ways:
► Defines Service Level Agreements (SLA) on a transaction base (response
time per transaction).
► Protects your production with Workload Management, in times of
unpretendable peaks.
► Uses z/OS functionality for billing based on used resources or transactions.
► Uses one central security repository, including Java role-based security.
► Builds a cluster inside of a single application server (multi-servant).
► Profits from near linear hardware and software scalability.
► Profits from System z cluster (Parallel Sysplex®) and up to 99.999%
availability.
For more information about WebSphere Application Server for z/OS V7.0, see
Chapter 14, “WebSphere Application Server for z/OS” on page 419 or visit the
following Web page:
http://www.ibm.com/software/webservers/appserv/zos_os390/
16 WebSphere Application Server V7.0: Concepts, Planning, and Design