IBM zSeries 800 and z/OS, z/OS.e, z/VM and VSE/ESA ... z/VM and VSE/ESA Reference Guide 2 zSeries Overview The IBM ^ zSeries is one of the fi rst enterprise-class platform optimized

December 2002

IBM ^ zSeries 800 and z/OS, z/OS.e, z/VM and VSE/ESAReference Guide

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zSeries Overview

The IBM ^ zSeries is one of the fi rst enterprise-

class platform optimized to integrate business applications

and to help meet the critical transactions and demands

of the e-business world far into the twenty-fi rst century.

The IBM ^ zSeries servers are designed to provide

these capabilities through a totally new system design

based on z/Architecture announced in October 2000 with

the IBM ^ zSeries 900 (z900).

The IBM ^ zSeries 800 (z800) servers use the

functional characteristics of the z900 in a package that is

designed to deliver excellent price/performance for those

requiring zSeries functionality with a lower capacity entry

point than that offered by z900.

The z800 offers ten General Purpose models, from a sub-

uni to a four-way, which can operate independently or as

part of a Parallel Sysplex cluster. There is a Coupling

Facility model and also a Dedicated Linux model on which

one to four engines can be enabled for the deployment of

Linux solutions.

The z800 takes advantage of the robust zSeries I/O sub-

system. High speed interconnects for TCP/IP communi-

cation, known as HiperSockets, let TCP/IP traffi c travel

between partitions at memory speed rather than network

speed. A high-performance Gigabit Ethernet feature is one

of the fi rst in the industry capable of achieving line speed:

1 Gb/sec. The availability of Native FICON devices, Fibre

Channels (FCP channels), 2 Gigabit per second links

and cascaded FICON directors can increase I/O perfor-

mance, simplify/consolidate channel confi gurations and

help reduce the cost of ownership.

The z800 benefi ts from the Intelligent Resource Director

(IRD) function, which directs resources to priority work. The

IRD function combines the strengths of key technologies:

z/OS, Workload Manager, Logical Partitioning and Parallel

Sysplex clustering.

Unique to the z800 is z/OS.e, a specially priced offering

for z/OS, providing select function at an exceptional price.

z/OS.e is intended to help customers exploit the fast growing

world of next generation e-business by making the deploy-

ment of new applications on the z800 very attractively

priced. z/OS.e uses the same code as z/OS, customized

with new system parameters, and invokes an operating

environment that is comparable to z/OS in service, man-

agement, reporting, and reliability. Also, z/OS.e invokes

key z800 hardware functionality that you would get from

z/OS. As a result, unless otherwise specifi ed, zSeries hard-

ware functionality described herein is applicable to both

z/OS and z/OS.e running on a z800 server.

While z/OS.e is unique to the z800, all existing zSeries

operating systems such as z/OS, z/VM and Linux are

supported and will be discussed later.

New Tools for Managing e-business

The IBM ^ product line is backed by a comprehen-

sive suite of offerings and resources that are designed to

provide value at every stage of IT implementation. These

tools can help customers test possible solutions, obtain

fi nancing, plan and implement applications and middle-

ware, manage capacity and availability, improve perfor-

mance and obtain technical support across the entire

infrastructure. The result is an easier way to handle the

complexities and rapid growth of e-business. In addition,

IBM Global Services experts and IBM Business Partners

can help with business and IT consulting, business trans-

formation, total systems management services, as well as

customized e-business solutions.

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Ease of Use and Self-Management

To help organizations deal effectively with complexity, IBM

provides a blueprint for autonomic computing which will

help enable self-managing, self-optimizing, self-protecting

and self-healing functions for systems. The goal is to use

technology to manage technology, creating an intelligent,

self-managing IT infrastructure that minimizes complexity

and gives customers the ability to manage environments

that are hundreds of times more complex and more

broadly distributed than exist today. This enables

increased utilization of technology without the spiraling

pressure on critical skills, software and service/support

costs.

The IBM autonomic computing initiative represents a major

shift in the way the industry approaches reliability, avail-

ability and serviceability (RAS). It harnesses the strengths

of IBM and its partners to deliver open, standards-based

servers and operating systems that are self-confi guring,

self-protecting, self-healing and self-optimizing. The object

of autonomic computing technology is to help ensure that

critical operations continue without interruption and with

minimal need for operator intervention.

The goal of autonomic computing is to help customers

dramatically reduce the cost and complexity of their

e-business infrastructures, and overcome the challenges

of systems management. The zSeries product line plays a

major role in autonomic computing, since the self-manage-

ment capabilities available for the zSeries will function

as a model for other IBM ^ platforms, such

as IBM ^ xSeries, IBM ^ iSeries and

IBM ^ pSeries.

zSeries servers and z/OS provide the ability to confi gure,

connect, extend, operate and optimize the computing

resources to help effi ciently meet the always-on

demands of e-business.

One of the key functions of z/OS is the Intelligent Resource

Director (IRD), an exclusive IBM technology that makes

the z800/z900 servers capable of automatically reallocat-

ing processing power to a given application on the fl y,

based on the workload demands being experienced by

the system at that exact moment. This advanced tech-

nology, often described as the living, breathing server,

allows the z800/z900 with z/OS to provide nearly unlimited

capacity and nondisruptive scalability to z/OS and non-

z/OS partitions such as Linux, according to priorities deter-

mined by the customer.

Although z/VM does not specifi cally support the IRD,

capabilities are provided for managing guest performance

to help achieve customer-defi ned goals. A new service

virtual machine, the Virtual Machine Resource Manager

(VMRM), accepts workload defi nitions, goal specifi cations,

and associations between them. Virtual machine CPU and

I/O performance controls are adjusted based on actual

performance to attempt to achieve the goals associated

with each workload. Additionally, I/O management facilities

have been added that enable z/VM to exploit the hardware

I/O Priority Queuing facility to prioritize guest and host

I/O operations. A virtual equivalent of the hardware facility

is provided, allowing virtual machines running operating

systems such as z/OS that exploit I/O Priority Queuing to

determine the priority of their I/O operations within bounds

defi ned by a new SET IOPRIORITY command. z/VM will

automatically set a priority for I/O operations initiated by

virtual machines that do not exploit this function.

The zSeries is based on the z/Architecture, which is

designed to eliminate bottlenecks associated with the

lack of addressable memory and automatically directs

resources to priority work through Intelligent Resource

Director (IRD). The z/Architecture is a 64-bit superset of

ESA/390.

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This architecture has been implemented on the zSeries

to allow full 64-bit real and virtual storage support. A maxi-

mum 32 GB of real storage is available on z800 servers.

zSeries can defi ne any LPAR as having 31-bit or 64-bit

addressability.

z/Architecture has:

64-bit general registers.

New 64-bit integer instructions. Most ESA/390 architec-

ture instructions with 32-bit operands have new 64-bit

and 32- to 64-bit analogs.

64-bit addressing is supported for both operands and in-

structions for both real addressing and virtual addressing.

64-bit address generation. z/Architecture provides 64-bit

virtual addressing in an address space, and 64-bit real

addressing.

64-bit control registers. z/Architecture control registers

can specify regions, segments, or can force virtual

addresses to be treated as real addresses.

The prefi x area is expanded from 4K to 8K bytes.

New instructions provide quad-word storage consistency.

The 64-bit I/O architecture allows CCW indirect data

addressing to designate data addresses above 2 GB for

both format-0 and format-1 CCWs.

IEEE Floating Point architecture adds twelve new instruc-

tions for 64-bit integer conversion.

The 64-bit SIE architecture allows a z/Architecture server

to support both ESA/390 (31-bit) and z/Architecture

(64-bit) guests. Zone Relocation is expanded to 64-bit

for LPAR and VM/ESA.

Use of 64-bit operands and general registers for all

Cryptographic Coprocessors instructions and Peripheral

Component Interconnect Cryptographic Coprocessors

(PCICC) instructions is added.

The im