Continuous Availability Recommended Configuration for

Parallel Sysplex

Key attributes can include

No single point of failure

Fast, automatic recovery

IC

z/OS

ICF

Dedicated (External)

Coupling Facility

z990 with CFs only z900 Model 100 9674, 9672 R06,

or z800 Model 0CF

Internal Coupling

Facility

z/OS

– CF: rebuild in surviving CF

– CEC, z/OS, OS/390: restart subsystems on surviving

image

– TM/DBMS: restart in place

• Surviving components absorb new work

• No service loss for planned or unplanned outages

• Near unlimited, plug-and-play growth capacity

Sysplex Timers

ESCON/FICON Express Channels

Note: z990 will attach to 9037-001 or 9037-002. Service for 9037-001 will be discontinued at the end of 2003.

Components and assumptions

Two Coupling Facilities; at least one external or else using System-Managed CF Structure Duplexing

Two Sysplex Timers

Two z/OS or OS/390 servers with redundant backup capacity

Two links from each CF to each image

Two hardware management consoles

Two ESCON or FICON Directors with cross-connected disks

Dual electrical power grids

Cloned OS/390 images, latest available software levels

Automation capabilities for recovery/restart

Critical data on RAID and/or mirrored disks

45

Page 45
Image 45
IBM z/OS manual No single point of failure, Components and assumptions