IBM z/OS User Manual download pdf (Page 45)

Continuous Availability Recommended Conﬁ guration for

Parallel Sysplex

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

Key attributes can include

• No single point of failure

• Fast, automatic recovery

– 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

ESCON/FICON Express Channels

z/OSz/OS

Internal Coupling

Facility

Dedicated (External)

Coupling Facility

z900 Model 100

9674, 9672 R06,

or z800 Model 0CF

ICF

z990

with CFs only

Sysplex Timers

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 87 88

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IBM z/OS User Manual Page 45