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A Comparison of System/390 Configurations - Parallel and Traditional

IBM Redbooks

A Comparison of System/390 Configurations - Parallel and Traditional

There is a clear consensus, from IBM, other vendors and industry
consultants, that parallel is the future for large systems. The question
is not whether parallel systems will happen, but when a user should move
to them.

This document compares parallel sysplex to traditional System/390 MVS
configuration options. It shows the relative advantages of each, in terms
of availability, performance, cost and systems management effort. This
will help users to select the configuration that most closely meets their
needs.

The configurations discussed are a single processor, a single
multiprocessor, two processors sharing DASD for backup purposes, two
processors in a parallel sysplex, and five processors in a parallel
sysplex. The document is intended to assist users to answer questions
such as:
- Should I implement a single stand-alone processor, or multiple
processors in a parallel sysplex?
- Should I upgrade to a larger processor, or should I add an additional
processor with a parallel sysplex?
- If I have multiple processors, is it more efficient to run them with
shared DASD (and no parallel sysplex), or in a parallel sysplex?
- Should I run a processor as a single system, or partitioned, either
physically, or logically using PR/SM?
This document was written for information systems managers and planners.

It is also relevant to IBM large systems marketing and technical
personnel. Some knowledge of System/390 and parallel sysplex is assumed.
Price: $24.00
Pages: 64
Date Published: October 19, 1995
ISBN: 0738407569
Author: IBM Redbooks
Product Number: SG24-4514-00
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