Chapter 2. Planning Considerations - IBM Z9 Planning Manual

Chapter 2. Planning Considerations

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Planning the I/O Configuration . . . . . . . . . . . . . . . . . . . 2-3
Coupling Facility Planning Considerations . . . . . . . . . . . . . . 2-39
© Copyright IBM Corp. 2005, 2008
Planning Considerations . . . . . . . . . . . . . . . . . . . . 2-3
Control Program Support . . . . . . . . . . . . . . . . . . . 2-3
Hardware Configuration Definition (HCD) Support . . . . . . . . . . 2-3
z/VM Dynamic I/O Configuration Support . . . . . . . . . . . . . 2-4
Input/Output Configuration Program (IOCP) Support . . . . . . . . . 2-4
Characteristics of an IOCDS . . . . . . . . . . . . . . . . . . 2-4
Maximum Number of Logical Partitions . . . . . . . . . . . . . . . 2-5
Determining the Size of the I/O Configuration . . . . . . . . . . . 2-5
Maximum Size of the I/O Configuration . . . . . . . . . . . . . . 2-5
Guidelines for Setting Up the I/O Configuration . . . . . . . . . . . 2-5
Recovery Considerations . . . . . . . . . . . . . . . . . . . 2-6
Managing Logical Paths for ESCON and FICON Channels . . . . . . . 2-7
Definition . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Control Unit Allocation of Logical Paths . . . . . . . . . . . . . . 2-7
Why Manage Logical Paths? . . . . . . . . . . . . . . . . . 2-7
Managing the Establishment of Logical Paths . . . . . . . . . . . . 2-11
Logical Path Considerations . . . . . . . . . . . . . . . . . 2-11
Recommendations . . . . . . . . . . . . . . . . . . . . . 2-12
Shared Channel Overview . . . . . . . . . . . . . . . . . . . 2-21
MIF Requirements . . . . . . . . . . . . . . . . . . . . . 2-21
Understanding ESCON and MIF Topologies . . . . . . . . . . . 2-21
MIF Performance Planning Considerations . . . . . . . . . . . . 2-22
Unshared ESCON or FICON Channel Recommendations . . . . . . . 2-27
Dynamically Managed CHPIDs . . . . . . . . . . . . . . . . . 2-27
IOCP Coding Specifications . . . . . . . . . . . . . . . . . . 2-28
IOCP Statements for ICP . . . . . . . . . . . . . . . . . . 2-28
Shared Devices Using Shared Channels . . . . . . . . . . . . . 2-31
Shared Devices Using Unshared Channels . . . . . . . . . . . . 2-31
Duplicate Device Numbers for Different Physical Devices
Test or Migration Coupling Configuration . . . . . . . . . . . . . . 2-39
CFCC Enhanced Patch Apply . . . . . . . . . . . . . . . . . 2-39
Production Coupling Facility Configuration . . . . . . . . . . . . . 2-40
Production Coupling Facility Configuration for Full Data Sharing . . . . 2-40
Production Coupling Facility Configuration for Resource Sharing . . . . 2-40
Internal Coupling Facility (ICF) . . . . . . . . . . . . . . . . . 2-41
Dynamic Coupling Facility Dispatching (DCFD) . . . . . . . . . . 2-42
Dynamic Internal Coupling Facility (ICF) Expansion . . . . . . . . . . 2-42
Enhanced Dynamic ICF Expansion Across ICFs . . . . . . . . . . . 2-43
System-Managed Coupling Facility Structure Duplexing . . . . . . . . 2-44
Single CPC Software Availability Sysplex
Coupling Facility Nonvolatility . . . . . . . . . . . . . . . . . . 2-45
Nonvolatility Choices . . . . . . . . . . . . . . . . . . . . 2-45
Setting the Conditions for Monitoring Coupling Facility Nonvolatility
Status . . . . . . . . . . . . . . . . . . . . . . . . 2-45
Coupling Facility Mode Setting . . . . . . . . . . . . . . . . . 2-45
Coupling Facility LP Definition Considerations . . . . . . . . . . . . 2-46
Internal Coupling Facility (ICF) . . . . . . . . . . . . . . . . 2-46
Coupling Facility LP Storage Planning Considerations . . . . . . . . . 2-47
Structures, Dump Space, and Coupling Facility LP Storage . . . . . . 2-47
Estimating Coupling Facility Structure Sizes . . . . . . . . . . . 2-48
. . . . . . 2-33
. . . . . . . . . . . . . 2-44
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