IBM eServer zSeries 900 Technical Guide

Chapter 5. Sysplex functions 181

򐂰 Can also be upgraded from

9674 R06 models

See Chapter 2, “zSeries 900 system structure” on page 17 for a description of SAPs, MBAs

and STIs.

Table 5-2 lists the options for the standalone CF z900 Model 100.

Table 5-2 Coupling Facility (Model 100)

5.2.3 Operating system to CF connectivity

The connectivity from a z/OS and/or OS/390 image to a Coupling Facility (and vice-versa) is

provided by coupling channels (coupling links). z/OS and/or OS/390 images and CF images

may be running on the same or on separate servers. Every z/OS or OS/390 image in a

Parallel Sysplex must have at least one coupling link to each CF image.

For availability reasons, there should be:

򐂰 At least two coupling links between z/OS and/or OS/390 and CF images

򐂰 At least two CF images (not running on the same server)

򐂰 At least two CF images are required for system-managed CF structure duplexing

򐂰 At least one standalone CF (if running with just “Resource Sharing” only, then a

stand-alone CF is not mandatory)

5.2.4 ICF processor assignments

Model 100

The advantage of using ICFs instead of CPs for CF Images is that, because an ICF cannot

run any z/OS or OS/390 operating systems, software licenses are not charged for those

processors.

The z900 Model 100 cannot have CPs or Integrated Facility for Linux (IFL), so it is an ICF-only

machine to run CF Images. The ICFs can be dedicated, shared, or both.

Feature Minimum Maximum Increment

ICF

a

a. Two SAPs come with the Model 100 and anywhere from 1 to 9 spare PUs,

depending on the number of ICFs.

191

Memory

b

b. Increments are 6, 7, 8, 10, 12, 14, 16, 20, 24, 28, and 32 GB.

5 GB 32 GB (see note b)

ISC-3

(c

,

d)

c. ISC-3 runs in either Native or Compatibility mode. There are up to four

ISC-3 links per card. A link may be defined as Native or Compatibility.

Link definitions on the same card can be a mixture of modes.

d. There is a system minimum of 1 ICB-3

or

1 ISC-3 channel and a system

maximum of 64 coupling channels, which can be a combination of

ICB-3/ICB or ISC-3 channels.

042

e

e. Via RPQ 8P2248, otherwise 32.

1

ICB-3 Peer

(d)

0161

ICB Compatibility 0 16

f

f. Up to 16 is available via RPQ and on configurations with from 13-16 ICBs,

the compatibility I/O cage FC 2022

cannot be configured.

1

182 IBM eServer zSeries 900 Technical Guide

Figure 5-2 on page 182 shows an example of what logical processor assignments for the

z900 Model 100 would be defined in the partition image profile.

򐂰 LP for CF 1 would have three dedicated ICF processors assigned.

򐂰 LP for CF 2 would have one shared ICF processor assigned.

򐂰 LP for CF 3 would have one shared ICF processor assigned.

This flexibility is very useful for mixed environments where a z900 Model 100 is being used for

more than one Parallel Sysplex system. Figure 5-2 also shows the z900 with an ICF partition

defined with two dedicated ICF processors.

Figure 5-2 Model 100 - ICF assignment example

A z900 Model 100 can have up to 15 Coupling Facility Images, each one having one of the

following:

򐂰 Dedicated ICF processors

򐂰 Shared ICFs

򐂰 Dedicated and

Shared ICFs

General purpose models

Currently, the general purpose z900 models are the following models:

򐂰 101 to 109

– 12 PU MCM (non-turbo)

򐂰 1C1 to 1C9 (capacity models)

– 20 PU MCM (non-turbo)

򐂰 110 to 116

– 20 PU MCM (non-turbo)

򐂰 2C1 to 2C9 (capacity models)

– 20 PU MCM (turbo)

򐂰 210 to 216

Function

Setup

HMC

z900

Partition

Image

Profiles

z/OS CF

CF (1)

CF (2)

CF (3)

z900 Model 100

Test Sysplex

z/OS z/OS z/OS

z900 z900