Chapter 1. IBM zSeries 990 overview 19
Draft Document for Review April 7, 2004 6:15 pm 6947ch01.fm
Figure 1-6 z990, the versatile server

Traditional database/transaction workloads

z/OS is well positioned as the deployment platform for e-business data transaction workloads.
The traditional S/390 strengths—scalability, high availability, low total cost of ownership and
robust security—are all necessary elements for a company seeking to create the kind of
flexible computing infrastructure required for enterprise-wide e-business solutions.
In addition, batch workloads, which never go away, even in an e-business environment, are a
strength for z/OS, particularly with its ability to run concurrent batch jobs with on-line and Web
workloads; and batch jobs get resources as they are available. The strength of zSeries I/O
subsystem and I/O balancing capabilities are also key reasons for this platform’s excellent
support of batch workloads.

UNIX System Services

UNIX System Services include shell functions, numerous utilities, and UNIX file systems.
Perhaps most significantly, what distinguished z/OS UNIX from other variants is that th e UNIX
services were integrated into the z/OS base, not added as middleware or shipped as a
separate S/390 operating system. As a result, not only can UNIX applications be written for
zSeries, but they can also take advantage of z/OS facilities and zSeries hardware to obtain
true enterprise server qualities of service.
The importance of UNIX System Services is growing because most new applications and
middleware build upon them.

zSeries File System (zFS)

To meet the changing needs of new workloads, a different file system is available with
OS/390® R10 and beyond. This file system is complementary to the existing Hierarchical File
System (HFS), but provides enhanced performance and easier management for many
different file usage patterns often encountered with new workloads.

The z990 Generation:

"A heterogeneous soft ware

model on

a homogeneous

hardware

platform"

zSeries Plat for m
Linux
z/OS z/VM
Linux
JVM
PR/SM LPAR (up to 30 logical part itions)
Consolidate
Cluster/Parallel
File/Disk/Print
Appl.+DB
ERP
IMS
CICS
Siebel
Linux
Appl
Java
&
EJB
Appl*
WebSphere
e-commerce
Business
appl.
Trans-
action
DL/I
DB2
Trans-
action