Summary of changes
This section describes the technical changes made in this edition of the book and in previous editions. This edition also includes minor corrections and editorial changes that are not identified.
Summary of Changes
for SG24-6374-08
for GDPS Family: An Introduction to Concepts and Capabilities
as created or updated on October 31, 2013.
October 2013, Update to Ninth Edition
New and changed information
•The following sections were added or updated in support of the GDPS/Active-Active V1R4 enhancements:
 – Section “What is a workload” on page 175 is updated.
March 2013, Ninth Edition
New and changed information
•“Protecting tape data” on page 61 is updated to include information about the TS7700 “in-doubt” tape support that is added in GDPS 3.10.
•“Region Switch” on page 137 is extended to describe the different possible configurations when performing a GDPS region switch.
•The following sections are updated with information about the GDPS/PPRC and GDPS/PPRC HM support of CONSISTENT FlashCopy® exploiting the IBM FlashCopy Freeze capability of the disk subsystems:
•The following sections are updated with the GDPS Health Check management panel information:
•Information about the legacy FREEZE option is removed from the following sections:
•The following new sections are added to describe add-on GDPS tools available for each of the GDPS products:
•Some screen captures are refreshed.
•A number of the sections are renamed or reorganized for clarity.
•A number of small changes are made for clarity or to correct minor errors.
July 2012, Eighth Edition
New information
•A new section “HyperSwap with less than full channel bandwidth” on page 58 is added to the GDPS/PPRC chapter. An equivalent section is added to the GDPS/HM chapter.
•3.5.1, “GDPS/PPRC health checks” on page 85 in Chapter 3, “GDPS/PPRC” on page 51, has been updated to include information that GDPS now ships sample coexistence policy definitions for the GDPS checks that are known to be conflicting with those provided with IBM z/OS®.
•4.4.1, “GDPS/PPRC HM health checks” on page 117 in Chapter 4, “GDPS/PPRC HyperSwap Manager” on page 95, has been updated to include information that GDPS now ships sample coexistence policy definitions for the GDPS checks that are known to be conflicting with those provided with IBM z/OS.
•A new section “System Management actions” has been added in Chapter 3, “GDPS/PPRC” on page 51 to accommodate customer procedures to perform specific LOAD and RESET actions
•A new section “SYSRES Management” on page 84 has been added to remove the requirement for clients to manage and maintain their own procedures when IPLing a system on a different alternate SYSRES device.
•The ability to use commands for taking a FlashCopy is added to 4.3.2, “NetView commands” on page 116.
•A new section “Query Services” has been added to Chapter 5, “GDPS/XRC” on page 127. It describes new capabilities in GDPS/XRC that improve system management and availability through autonomic capabilities.
•A new section “Region Switch” has been added in 5.4, “Managing the GDPS environment” on page 131 to reflect a process for performing a planned Site Switch between the two sites that act as the application and recovery sites. New capabilities of the GDPS/XRC product assist with and simplify various procedural aspects of a Site Switch or Return Home operation.
•A new section 5.6.4, “Vary-After-Clip automation” on page 143 has been added to Chapter 5, “GDPS/XRC” on page 127. With XRC primary devices online in the SDM systems, Vary After Clip processing detects an XRC primary volume has been relabelled and automates varying the subject device online with the new volume label in SDM systems, and schedules a VOLSER REFRESH-type GDPS Configuration update.
•A new section 6.6.1, “GDPS/GM Copy Once facility” on page 167 has been added in Chapter 6, “GDPS/Global Mirror” on page 149 to provide information about the Copy Once facility to copy volumes that have data sets on them that are required for recovery but the content is not critical, such that they do not require to be copied all the time.
•A new section 8.2, “GDPS/PPRC Multiplatform Resiliency for System z” on page 216 has been added in 8.2, “GDPS/PPRC Multiplatform Resiliency for System z” on page 216 to reflect the GDPS system management capabilities for IBM z/VM® and Linux systems. GDPS controlled shutdown of z/VM (also referred to as graceful shutdown) has also been included.
Changed information
•Section “Addressing z/OS device limits in a GDPS/PPRC environment” in 2.4.1, “PPRC (IBM Metro Mirror)” on page 22 is updated to reflect the new support, the PPRC secondary of IPL, IODF and Stand-Alone Dump devices for z/OS systems in the GDPS sysplex can be defined in the alternate subchannel set (MSS1).
•Section “PPRC-based solutions” in 2.9, “Cross-site connectivity considerations” on page 42 is updated to include considerations about possible use of IBM HyperSwap® with less than full bandwidth cross-site connectivity.
•Section “Sysplex resource management” in 3.4, “Managing the GDPS environment” on page 70 has been updated to include GDPS Coupling Facility Management with a single CFRM policy.
•Section “GDPS HyperSwap function” in Chapter 3, “GDPS/PPRC” on page 51 and in Chapter 4, “GDPS/PPRC HyperSwap Manager” on page 95 has been updated to include information about the new, proactive unplanned HyperSwap trigger in conjunction with a new function available in z/OS 1.13 and the new Storage Controller Health Message capability in the IBM DS8700/DS8800 disk subsystems.
•5.6.1, “FlashCopy disk definition in the GDPS systems” on page 142 in Chapter 5, “GDPS/XRC” on page 127 has been updated to include the new FlashCopy protection support, a new GDPS logic to ensure that when a FlashCopy is taken, it is only taken if the FlashCopy source devices represent a valid recovery point.
•8.2.1, “Guest Linux under z/VM” on page 216 in 8.2, “GDPS/PPRC Multiplatform Resiliency for System z” on page 216 has been updated to reflect various enhancements in GDPS/PPRC xDR such as definition of two Proxy nodes for each z/VM host, shutdown of an xDR-managed z/VM system in multiple phases, and z/VM system shutdown using the GDPS Stop Standard Action (or equivalent script statement) with all xDR-managed guests stopped in parallel.
•8.2.1, “Guest Linux under z/VM” on page 216 in 8.2, “GDPS/PPRC Multiplatform Resiliency for System z” on page 216 reflects that GDPS 3.9 xDR for the z/VM guest environment no longer supports REXEC as the communication protocol between the xDR Proxy and the GDPS Controlling systems. SOCKET protocol remains the only supported protocol.
•8.2, “GDPS/PPRC Multiplatform Resiliency for System z” on page 216 has been updated to reflect IBM z/VSE® guests of xDR-managed z/VM systems can be enabled for special GDPS xDR monitoring and management.
•8.2, “GDPS/PPRC Multiplatform Resiliency for System z” on page 216 has been updated to provide added protection for an xDR-managed z/VM or native Linux system that must be reset during HyperSwap, to ensure that the subject system does not continue to run and update the former primary disks.
•2.5, “Tape resident data” on page 37 and 3.1.2, “Protecting tape data” on page 61 has been updated to reflect the GDPS/PPRC support for configuration management of the IBM Virtualization Engine TS7700.
•6.3, “GDPS/GM management for distributed systems and data” on page 155 has been updated to reflect the DCM capability in GDPS/GM for managing local cluster sets using IBM Tivoli® System Automation Application Manager.
•The RCMF offerings are generally replaced by more full featured GDPS offering peers, so the RCMF appendixes have been removed.
June 2011, Seventh Edition
New information
•This document was updated to reflect the changes and new capabilities of GDPS V3.8 and the GDPS/Active-Active solution
•A new section “IBM software replication products” has been added to Chapter 2, “Infrastructure planning for availability and GDPS” on page 13 to provide an introduction to the supported IBM software-based replication products within the GDPS/Active-Active solution.
•A new section “Freeze policy (PPRCFAILURE policy) options” has been updated to include information about the new PPRCFAILURE and PRIMARYFAILURE freeze/swap policy options and enhanced Freeze&Stop Conditional processing.
•New sections “STP CTN role reassignments - planned operations” on page 80, “STP CTN role reassignments - unplanned failure” on page 83, and “STP WTOR IEA394A response- unplanned failure” on page 83 have been added to Chapter 3, “GDPS/PPRC” on page 51. They describe the new scripting capability to reassign roles in an STP-only Coordinated Timing Network (CTN), and the capability to respond to WTORs posted by IBM z/OS.
•A new section 4.3.2, “NetView commands” on page 116 has been added to Chapter 4, “GDPS/PPRC HyperSwap Manager” on page 95 to describe the HYPERSW command and the new GDPSTIME command to reassign roles in an STP-only CTN.
•New sections “FlashCopy disk definition in the GDPS systems” and “GDPS/XRC Configuration checking” have been added to Chapter 5, “GDPS/XRC” on page 127. They describe miscellaneous enhancements that improve scalability, management, and data consistency for GDPS/XRC.
•New sections “GDPS/GM Query Services”, and “Global Mirror Monitor integration” have been added to Chapter 6, “GDPS/Global Mirror” on page 149. They describe new capabilities in GDPS/GM that improve system management and availability through autonomic capabilities.
•A new chapter, Chapter 7, “GDPS/Active-Active” on page 173 is added to describe the GDPS/Active-Active solution.
•A new section 8.2.3, “Customization Verification Program” on page 221 was added to describe new capabilities to verify that installation and customization activities have been carried out correctly for both xDR native and guest Linux on System z environments.
•A new section 8.2.4, “xDR Extended Monitoring” on page 221 was added to describe the extended monitoring function now available for xDR systems that previously was available only for z/OS systems.
•A new section “GDPS/MGM Incremental Resynchronization Tool” has been added to Chapter 9, “Combining Local/Metro continuous availability with out-of-region disaster recovery” on page 245 to describe its functionality and to mention that this tool is a fully supported tool in GDPS/MGM V3.8.
Changed information
•The introductory chapters, Chapter 1, “Introduction to business resilience and the role of GDPS” on page 1 and Chapter 2, “Infrastructure planning for availability and GDPS” on page 13 are updated to include new information about the considerations when using software replication for the GDPS/Active-Active solution.
•Section “Freeze policy (PPRCFAILURE policy) options” in has been updated.
•Section 3.1.3, “Protecting distributed (FBA) data” on page 62 has been updated to add support for SCSI attached FB disk used by native Linux for System z systems under GDPS xDR control.
•Section “Flexible testing” has been updated in Chapter 5, “GDPS/XRC” on page 127 to indicate changes in IBM Zero Suspend FlashCopy support.
•Section 8.1, “Open LUN Management function” on page 214 was updated to include support for SCSI attached FB disk used by native Linux for System z systems under GDPS xDR control.
•Section 8.2, “GDPS/PPRC Multiplatform Resiliency for System z” on page 216 was reformatted to include separate sections 8.2.1, “Guest Linux under z/VM” on page 216 and 8.2.2, “Native Linux on System z” on page 219 and updated to include support for SCSI-attached FB disk used by native Linux for System z systems under GDPS xDR control.
August 2010, Sixth Edition
New information
•This document has been updated to reflect changes and new capabilities in GDPS V3.7 including support for PPRC secondary devices defined in an alternate subchannel set and xDR improvements with starting and stopping Linux systems on System z.
•Added references to Microsoft Windows clusters (particularly in “Integrated configuration of GDPS/GM and VCS clusters” on page 228) as part of the GDPS DCM for VCS function.
Changed information
•Chapter 1, “Introduction to business resilience and the role of GDPS” on page 1 has been rewritten to remove references to SHARE workgroup material and the focus on disaster recovery. Additionally, the overview of the GDPS family of offerings was updated to help this chapter act as a stand-alone high level overview.
•Chapter 2, “Infrastructure planning for availability and GDPS” on page 13 has been modified, moving some of the more technical details to subsequent chapters, but retaining the broad overview of numerous areas of technology infrastructure that are touched or leveraged by a GDPS solution.
•Section 3.1.1, “Protecting data integrity and data availability with GDPS/PPRC” on page 52 was re-written to remove the discussion about detailed “CRIT” settings not recommended for use with GDPS. References to other documentation with details about these settings are still included. Similar changes were made to Chapter 4, “GDPS/PPRC HyperSwap Manager” on page 95.
•References to Metro Mirror were replaced by PPRC when discussing the IBM synchronous mirroring architecture. The brand name of IBM Metro Mirror continues to be used for the implementation of the PPRC architecture included on the IBM Enterprise Storage Server® (ESS) and DS8000® family of storage products. A similar change was made for XRC and the IBM brand name of z/OS Global Mirror.
•There was a minor reordering of the chapters following the overview of the four primary GDPS offerings.
•Removed Peer-to-Peer tape from “DR in two data centers, global distance” on page 274 because the configuration of this legacy hardware (with immediate mode) is not appropriate as a recommendation for global distances.
September 2009, Fifth Edition
New information
•This document has been updated to reflect changes and new capabilities in GDPS V3.6.
•A new section “Other facilities related to GDPS” was created as a repository for miscellaneous topics such as HyperSwap coexistence available in previous versions of GDPS, and new topics available with GDPS V3.6 such as Reduced impact initial copy and resynchronization and Query Services.
Changed information
•2.1.2, “Multisite sysplex considerations” on page 14 was updated to change the maximum fiber distance from 100 km to 200 km (with RPQ).
•2.8.1, “Capacity Backup Upgrade” on page 41 and 2.8.2, “On/Off Capacity on Demand” on page 42 have been updated to indicate the general availability of new functions for GDPS V3.5 and higher.
•Multiple changes were made in 2.9, “Cross-site connectivity considerations” on page 42 to reflect the recently available Parallel Sysplex InfiniBand technology for coupling and STP and HMC connectivity requirements for STP.
•9.3, “GDPS Metro/Global Mirror solution” on page 251 and 9.4, “GDPS Metro z/OS Global Mirror solution” on page 258 have been updated to include the Incremental Resynchronization function.
•Tables provided in Chapter 3, “GDPS/PPRC” on page 51, Chapter 4, “GDPS/PPRC HyperSwap Manager” on page 95, Chapter 5, “GDPS/XRC” on page 127, and Chapter 6, “GDPS/Global Mirror” on page 149 that compare functions offered by each GDPS offering have been updated to include a comprehensive list of GDPS functions available to date.
September 2008, Fourth Edition
New information
•This document has been updated to reflect changes and new capabilities in GDPS V3.5.
March 2007, Third Edition
New information
•This document has been updated to reflect changes and new capabilities in GDPS V3.3 and GDPS V3.4.
•A new section, “Synchronous versus asynchronous data transfer” on page 19, was added to explain the business impact of using Synchronous and Asynchronous remote copy technologies.
•Multiplatform for System z now supports native zLinux LPARs.
•GDPS/PPRC and GDPS HyperSwap Manager have been enhanced to provide coexistence support for HyperSwap and IBM TDMF®.
•IBM IMS™ XRF coexistence support added to GDPS/PPRC and GDPS HyperSwap Manager.
•GDPS/PPRC provides for transparent exploitation of the PPRC Failover and Failback support if available in all disk subsystems.
•GDPS/Global Mirror has been enhanced to provide “No UCB FlashCopy’ support.
•Zero Suspend FlashCopy support added to GDPS/XRC and GDPS/MzGM.
•Availability of a GDPS Qualification Program for vendor storage subsystems.
•New WEB GUI interface support added for GDPS/PPRC.
•GDPS/PPRC and GDPS HyperSwap Manager have been enhanced so that a HyperSwap can now be triggered by a non-responsive primary device, in addition to the existing error conditions that can cause a HyperSwap.
•GDPS/PPRC has been enhanced to support the new GDPS Enhanced Recovery Services in IBM z/OS 1.8.
•The ability has been added to GDPS/PPRC to do a planned freeze covering both CKD and FBA devices.
•FlashCopy support for Open LUN devices has been added to GDPS/PPRC and GDPS HyperSwap Manager.
•GDPS/XRC has been enhanced to support the new asynchronous write support for system logger stagging data sets added in z/OS 1.7.
Changed information
•The GDPS/PPRC BRS configuration has moved to Chapter 3, “GDPS/PPRC” on page 51.
•GDPS/XRC scalability enhancements allow up to 20 SDMs in a single LPAR, of which 13 can be coupled together into a cluster. Up to 14 clusters can be coupled together increasing the architectural limit to 182 SDMs.
December 2005, Second Edition
This revision reflects the addition, deletion, or modification of new and changed information as described in this section.
New information
•Information about the GDPS/GM offering has been added
 
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