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Chapter 9. Parallel sysplex planning
This chapter is intended to provide guidance to those customers who operate in a Parallel Sysplex
environment. A Parallel Sysplex typically involves multiple processors and coupling facilities, shared I/O
devices, and a host of interconnection possibilities. Detailed planning for a Parallel Sysplex is essential to
meet technical objectives, such as performance and high availability, within the constraints of a specific
raised floor configuration. Consider using IBM Site and Facilities Services to plan your sysplex
environment. A list of tasks the Service can perform is provided under "IBM Site and Facilities Services"
on page 97. Different technologies for servers, links and coupling facilities affect your ability to configure
a productive sysplex.
The basic premise for a successful Parallel Sysplex installation is to centralize the physical location of the
coupling facilities, and then position the sysplex servers around that center. Servers can be placed
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side-to-side. In addition to bringing the servers closer to the coupling facility, placing your server
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side-to-side provides for better management of hot and cold air flow.
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Following are some guidelines to help you better plan for multiple system interconnection. These are
example configurations that would minimize the distance to the coupling facility.
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1. Position the coupling facilities (or servers with internal coupling facilities) in the center of an open
area of raised floor large enough to accommodate all of the servers and other coupling facilities to
which you want to connect.
= 610 mm (24 in) floor tiles
= Perforated floor tile
v Use physical planning information for each type of server/coupling facility you intend to add to
the Parallel Sysplex to help determine how much floor space you will need.
v Remember to consider weight distribution, service clearances, power, and cooling for each piece of
equipment you want to include.
2. Arrange the sysplex in two rows, with the fronts of servers and coupling facilities facing each other
(see the illustration under "Weight distribution and multiple systems" on page 38). Allow a 1168 mm
© Copyright IBM Corp. 2012, 2014
ICF
= Cool aisle, 1.22 meters
= Exhaust (heated air from
Level 01f
121
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