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 IBM Redbooks publication SG24-6374-17
for IBM GDPS: An Introduction to Concepts and Capabilities
as created or updated on April 13, 2022.
March 2022, Eighteenth Edition
New and changed information
•The section titled “GDPS xDR support for Red Hat OpenShift Container Platform (RHOCP)” on page 83 was added to describe the GPDS xDR support for RHOCP.
•The section titled “Remote copy windows” on page 92was updated to describe the new dynamic PPRC link management capability.
•The section titled “GDPS graphical user interface” on page 184 was updated to indicate that the GUI is now supported in MGM environments.
•Section 6.3.5, “Securing the GDPS environment” on page 193 was added to describe the new role-based security capability of GDPS Global - GM.
•The section titled “What is a workload” on page 205 was updated to reflect that a workload can consist of both IMS and IBM Db2®.
•Section 7.2.7, “Replication software” on page 212 was updated to describe Global Consistency Groups for IMS, which provides scalability improvements to IIDR for IMS.
•The section titled “Planned Actions” on page 234 was updated to reflect the following changes:
 – VSAM workloads can now be switched with a single ROUTING SWITCH command.
 – During switch operations, data associated with all update workload types (Db2, IMS, and VSAM) is fenced in the original active site and unfenced in the new active site.
•Section 10.3.2, “GDPS Global - GM” on page 302 was updated to reflect the new capability to implement External LCP in GDPS GM 2-site environments.
•Section 10.4.1, “Scripting” on page 314 was updated to describe the new incremental restore to production capability and to provide addition information about the existing restore functions in LCP environments.
•Section 10.4.3, “Securing the GDPS LCP environment” on page 325 was added to describe the new role-based security capability of the GDPS LCP Manager.
•Chapter 12, “GDPS Enterprise Portal” on page 345 was added to describe the new GDPS Portal.
•Several small changes were made for clarity, consistency, or to correct minor errors.
March 2021, Seventeenth Edition
New and changed information
•The section “Disk and LSS configuration” on page 81 was updated to reflect that disk sharing is now allowed between systems inside and outside of the GDPS sysplex using hardware reserves.
•3.4.1, “z/OS Proxy disk and disk subsystem sharing” on page 88. The following changes were made to describe the IBM Easy Tier® Heat Map Transfer functions available in GDPS MGM and GDPS MzGM environments, including the enhanced capabilities recently added to GDPS MGM:
 – The information describing the Easy Tier Heat Map Transfer function in GDPS Metro was relocated to new section 3.7.5, “Easy Tier Heat Map Transfer” on page 107.
•Section 3.5.2, “GDPS scripts” on page 96 was updated to describe the new CEC failure takeover script capability.
•Section 3.6.1, “GDPS Metro health checks” on page 104 and section “GDPS Metro HyperSwap Manager health checks” on page 140 were updated to indicate that SDF alerts can now optionally be raised for health check exceptions.
•The following changes were made in support of the new RESTful API support in GDPS GM:
 – New section 6.3.3, “Application programming interfaces” on page 192 was added to describe the APIs available to manage the GDPS GM environment.
 – The information describing the Query Services API was moved to new section 6.3.3, “Application programming interfaces” on page 192.
 – New section “RESTful APIs” on page 102 was added to describe the new RESTful API feature for GDPS GM.
•The following sections were updated to indicate that the GM FC disks are no longer required to be defined to the GDPS GM R-sys:
•Section 9.4, “GDPS Metro Global - GM 4-site solution” on page 283 was updated to reflect that Managing devices defined in an alternate subchannel set is now supported in GDPS MGM 4-site environments.
•The “GDPS graphical user interface” on page 90 section is updated to indicate that the GDPS GUI is able to manage GDPS MGM 3-site and 4-site environments.
•Updates were made to the following sections to describe the new support for internal and external LCP in GDPS GM 3-site and 4-site environments:
•Section 10.1, “LCP terminology” on page 296 was updated to describe the new ability to dynamically expand SGC backup capacity devices in LCP environments.
•The following sections were updated to describe the ability to now have multiple Recovery copy sets in LCP environments:
•Section 9.4, “GDPS Metro Global - GM 4-site solution” on page 283 was updated to reflect that IBM Db2 Analytics Accelerator on Z systems running in Secure Service Containers is now supported in GDPS MGM 4-site environments.
•The following updates were made to describe the integration of GDPS MGM 3-site and GDPS CA to provide a zero data loss capability over regional distances:
 – The section titled“Zero Data Loss at distance” on page 283 was added
•The following updates were made to describe GDPS support for Capacity for Planned Events (CPE) and System Recovery Boost (SRB):
 – Section 2.8.3, “Capacity for Planned Events” on page 43 was added to describe CPE support.
 – Section 2.8.4, “System Recovery Boost” on page 43 was added to describe SRB support.
 – Information related to CPE and SRB was added to section 2.8.5, “GDPS CBU, On/Off CoD, CPE, and SRB” on page 43.
•Section “GDPS scripts” on page 96 was updated to describe the enhancements made to planned actions that allow currently running scripts to be stopped and scripts that were previously stopped or that failed to be restarted.
•Section 7.2.5, “IBM Multi-site Workload Lifeline for z/OS” on page 211 was updated to describe the availability of user exits provided by the Multi-site Workload Lifeline manager to allow management of workloads that use unsupported connectivity methods.
•The following changes were made in support of the new RESTful API support in GDPS XRC:
 – New section 5.3.3, “Application programming interfaces” on page 162 was added to describe the APIs available to manage the GDPS XRC environment.
 – The information describing the Query Services API was moved to new section 5.3.3, “Application programming interfaces” on page 162.
 – New section “RESTful APIs” on page 162 was added to describe the new RESTful API feature for GDPS XRC.
•Several small changes were made for clarity, consistency, or to correct minor errors.
March 2020, Sixteenth Edition
New and changed information
•The following sections were updated to describe the workflow enhancements function, which allows scripts to be stopped, restarted, and so on:
 – “Planned Actions” on page 97 for GDPS Metro
•Section 3.5.5, “Securing the GDPS environment” on page 103 was added to describe the Role-Based Security enhancements provided in GDPS Metro.
•The following sections were updated to describe the Global ZDL configuration:
•The following updates were made to section 4.8, “GDPS tools for GDPS Metro HyperSwap Manager” on page 145:
 – Information describing the Preserve Mirror Tool, the Configuration Checker Tool (GEOCHECK), and the GDPS Configuration Assistant (GeoAssistant) Tool was removed; these tools are no longer supported.
 – Information describing the GDPS XML Conversion (GeoXML) Tool and the GDPS EasyLog Tool was added.
•Section 9.3, “GDPS Metro Global - GM 3-site solution” on page 275 and section 9.4, “GDPS Metro Global - GM 4-site solution” on page 283, were updated to remove references to the cascaded-only configuration of GDPS MGM.
•The following changes were made in support of the new RESTful API enhancements:
 – 7.4, “GDPS Continuous Availability functions and features” on page 221 was updated to include APIs as another mechanism to manage the GDPS CA environment.
 – New section 7.4.7, “Application programming interfaces” on page 237 was added to describe the APIs available to manage the GDPS environment.
 – The information describing the Query Services API was moved to new section “GDPS Continuous Availability Query Services” on page 237.
 – New section “RESTful APIs” on page 102 was added to describe the new RESTful API capability.
 – 4.4, “Managing the GDPS Metro HyperSwap Manager environment” on page 133 was updated to include APIs as another mechanism to manage the GDPS HM environment.
 – New section 4.4.3, “Application programming interfaces” on page 139 was added to describe the APIs available to manage the GDPS environment.
 – The information describing the Query Services API was moved to new section “GDPS Metro HyperSwap Manager Query Services” on page 139.
 – New section “RESTful APIs” on page 139 was added to describe the new RESTful API capability.
•The following changes were made to describe the new support for Fixed Block (FB) disk:
 – Minor changes were made to the following sections:
 – Section 3.3, “GDPS Metro management of distributed systems and data” on page 77 was added to combine the introduction of the new FB disk support with the introduction of the existing xDR capabilities for GDPS Metro.
 – Section 3.3.1, “Fixed Block disk management” on page 77 was added to describe the details of the new FB disk support for GDPS Metro.
 – The information describing the existing xDR support for IBM z/VM and KVM was moved to new section 3.3, “GDPS Metro management of distributed systems and data” on page 77.
 – 4.1.2, “Protecting distributed (FB) data” on page 127 was added to provide a brief introduction to the topic for GDPS HM.
 – 4.3, “Fixed Block disk management” on page 132 was added to describe the details of the new FB disk support for GDPS HM.
•The following changes were made to describe the new support for IBM Db2 Analytics Accelerator on Z (running in a Secure Service Container - SSC):
 – 3.1.4, “Protecting other CKD data” on page 68 was updated to mention the new support.
 – Section 3.3.2, “Multiplatform Resiliency for IBM Z” on page 78 was updated to provide an introduction to the support for GDPS Metro.
 – Section “Multiplatform Resiliency for IBM Db2 Analytics Accelerator on Z” on page 85 was added to describe the support in GDPS Metro.
 – 9.3.8, “GDPS MGM 3-site support for multiple IBM Z platforms” on page 281 was added to describe the support in GDPS MGM 3-site environments.
 – 9.4, “GDPS Metro Global - GM 4-site solution” on page 283 was updated to indicate that support is not provided in GDPS MGM 4-site environments.
•The following changes were made to describe the new support for LCP:
 – 3.8, “Flexible testing, resync protection, and Logical Corruption Protection” on page 108 was updated to introduce SGC support for LCP in GDPS Metro environments.
 – 6.6.3, “Logical Corruption Protection” on page 199 was added to introduce the new LCP support in GDPS GM environments.
 – 9.4.1, “Benefits of a GDPS MGM 4-site configuration” on page 285 was updated to mention LCP and TCM support.
 – All of the sections in Chapter 10, “GDPS Logical Corruption Protection and Testcopy Manager” on page 295 were updated to describe the following new LCP functions:
 • Management profile support
 • SGC support
 • External LCP support for GDPS Metro environments
 • Internal LCP support for GDPS GM environments
 • Internal LCP support for GDPS MzGM environments
•Several small changes were made for clarity, consistency, or to correct minor errors.
March 2019, Fifteenth Edition
New and changed information
•All references to the Distributed Cluster Manager (DCM) support are removed.
•The following sections were updated to describe the new restore and recover enhancements provided for the LCP function:
 – 2.6, “FlashCopy” on page 38 was updated to mention LCP and refer to the LCP chapter
 – 3.8, “Flexible testing, resync protection, and Logical Corruption Protection” on page 108 was updated to refer to the LCP chapter.
 – 9.4, “GDPS Metro Global - GM 4-site solution” on page 287 was updated to mention the Testcopy Manager and refer to the LCP chapter.
 – 10.4.1, “Scripting” on page 314 was updated to describe the restore and recover functions.
 – The following figures in Chapter 10 were updated to depict the new restore and recover functions:
 – Section 10.4.1, “Scripting” on page 314 was updated to summarize the scripting capability for internal LCP including the new restore and recover functions.
 – The panel information that was located in section 10.4.1, “Script statements” on page 317 was updated to apply to both internal and external LCP and moved to new section 10.4.2, “Panels” on page 318.
 – New section 10.4.1, “Scripting” on page 314 was added to summarize the scripting capability for external LCP including the new LCP restore and LCP recover functions.
 – Section 10.4.1, “Scripting” on page 314 was updated to summarize the scripting capability for the Testcopy Manager including the new LCP restore and LCP recover functions.
•Section “Addressing z/OS device limits in a GDPS Metro environment” on page 25 was updated to describe the ability to exploit “no UCB IBM FlashCopy®” in GDPS Metro environments.
•Section “Scalability in a GDPS XRC environment” on page 31 was updated to describe the new capability to place the FlashCopy target devices in MSS2 and to perform an XRC recover of these devices on the Ksys.
•Much of Section 5.5, “Other GDPS-related facilities” on page 165 was updated to clarify and simplify the description of the XRC offline volume support with the introduction of full device-based management.
•Section 5.5.3, “Vary-After-Clip automation” on page 166 was updated to reflect that Vary After Clip processing no longer varies devices online with the introduction of full device-based management.
•New section 9.5.5, “Scalability in a GDPS MzGM 3-site environment” on page 289 was added to describe the new ability to define the PPRC secondary devices in MSS1 in GDPS MzGM environments.
•The following changes were made in support of the new RESTful API support:
 – Section 3.5, “Managing the GDPS environment” on page 89 was updated to include APIs as another mechanism to manage the GDPS environment.
 – New section 3.5.3, “Application programming interfaces” on page 101 was added to describe the APIs available to manage the GDPS environment.
 – The information describing the Query Services API was moved to new section 3.5.3, “Application programming interfaces” on page 101.
 – New section “RESTful APIs” on page 102 was added to describe the new RESTful API feature.
•Several small changes were made for clarity, consistency, or to correct minor errors.
December 2018, Fourteenth Edition
New and changed information
•All occurrences of the terms “IBM System z®” and “IBM z Systems®” have been removed or changed to “IBM Z.”
•All references to the IBM ESCON channel technology have been removed or replaced with IBM FICON references.
•All references to the IBM zEnterprise® BladeCenter Extension (z/BX) have been removed
•All references to IBM Tivoli® System Automation Application Manager (SA AppMan) have been removed
•The information in Chapter 3, GDPS/PPRC and Chapter 7, GDPS/MTMM have been combined to form a new Chapter 3 called GDPS Metro.
• The “supported features” matrices in all of the chapters have been updated to remove GDPS/PPRC and GDPS/MTMM and to add GDPS/Metro.
•All occurrences of the terms “GDPS/PPRC” and “GDPS/MTMM” have been removed or changed to “GDPS Metro.”
•All occurrences of the term “GDPS/XRC” have been removed or changed to either “GDPS XRC” or “GDPS Global - XRC.”
•All occurrences of the term “GDPS/GM” have been removed or changed to either “GDPS GM” or “GDPS Global - GM.”
•All occurrences of the terms “GDPS/PPRC IBM HyperSwap® Manager,” “GDPS/PPRC HM,” “GDPS/HM,” and “GDPS/HyperSwap Manager” have been removed or changed to either “GDPS Metro HyperSwap Manager” or “GDPS HM.”
•All occurrences of “GDPS/Metro Global Mirror,” “GDPS/Metro-Global Mirror,” and “GDPS/MGM” have been removed or changed to either “GDPS Metro Global - GM” or “GDPS MGM.”
•All occurrences of “GDPS/Metro z/OS Global Mirror” and “GDPS/MzGM” have been removed or changed to either “GDPS Metro Global - XRC” or “GDPS MzGM.”
•All occurrences of “Open LUN” have been removed or changed to “Fixed Block disk.”
•All occurrences of “Open LUN Management” have been removed or changed to “Fixed Block disk management.”
•All occurrences of “H1,” “H2,” and “H3” have been changed to “RS1,” “RS2,” and “RS3.”
•Occurrences of “PPRC” that refer to the mirroring technology itself have been changed to “Metro Mirror.” Some occurrences of “PPRC” that refer to specifically named commands or features remain unchanged.
•Chapter 11, “GDPS extensions for heterogeneous systems and data” has been removed:
 – The information regarding Fixed Block Disk management in GDPS Metro has been moved to new section 3.3.1, “Fixed Block disk management” on page 78.
 – The information regarding Fixed Block Disk management in GDPS Metro HyperSwap Manager has been moved to new section 4.3, “Fixed Block disk management” on page 138.
 – The information regarding Fixed Block Disk management in GDPS GM has been moved to new section 6.3.1, “Fixed Block Disk Management” on page 190.
 – The information regarding xDR support in GDPS Metro has been moved to new section 3.3.2, “Multiplatform Resiliency for IBM Z (also known as xDR)” on page 79
 – The information regarding DCM support for VCS clusters in GDPS Metro has been moved to new section 3.3.3, “Distributed Cluster Management” on page 84.
 – The information regarding DCM support for VCS clusters in GDPS GM has been moved to new section 6.3.2, “Distributed Cluster Management” on page 191.
 – The information regarding DCM support for VCS clusters in GDPS XRC has been moved to new section 5.3, “GDPS XRC management of distributed systems and data” on page 160.
•The following sections are updated or added in support of the exploitation of the new DS8K z/OS Fixed Block Architecture (zFBA) feature for accessing FB disks from z/OS systems:
 – “Supported platforms with IBM Metro Mirror” on page 24
 – “FB disk management prerequisites” on page 79
 – 4.3.1, “FB disk management prerequisites” on page 139
•Section 3.2, “GDPS Metro configurations” on page 70, has been updated to describe the single-leg and dual-leg configurations of GDPS Metro.
•Section 3.5.1, “User interfaces” on page 96, has been updated to describe the new GUI for GDPS Metro.
•“Easy Tier Heat Map Transfer” on page 67 has been updated to describe performance-enhancing changes to the GDPS HMTU.
•Section 5.6.1, “Device-based management” on page 174 has been updated to describe the use of 5-digit device numbers.
•Section 5.6.6, “GDPS use of the XRC offline volume support” on page 175 has been updated to describe changes to the OFFLINEPRI parameter.
•Section 7.4, “GDPS Continuous Availability functions and features” on page 230 has been updated to describe the GDPS Graphical User Interface (GUI).
•Section 7.7, “Zero Data Loss Configuration” on page 259 has been updated in support of the Symmetrical Zero Data Loss configuration for GDPS Continuous Availability environments.
•Section 9.3, “GDPS Metro Global - GM 3-site solution” on page 293 has been updated to describe enhancements to GDPS MGM 3-site configurations.
•Chapter 10., “LCP and Testcopy Manager” on page 311 has been added to describe the LCP (Logical Corruption Protection) manager, a feature that allows GDPS MGM 4-site customers to capture multiple copies of the production disk.
•Several small changes have been made for clarity, consistency, or to correct minor errors.
March 2017, Thirteenth Edition
New and changed information
•The following sections are updated or added in support of the new GDPS/MGM Multi-Target 3-site solution:
 – 1.5, “GDPS offerings” on page 8
 – 3.13, “Comparison of GDPS/PPRC versus other GDPS offerings” on page 99
 – 3.13, “Comparing GDPS Metro to other GDPS offerings” on page 118
 – 3.2.8, “Combining GDPS Metro with GDPS GM or GDPS XRC” on page 79
 – 4.11, “Comparison of GDPS Metro HyperSwap Manager to other GDPS offerings” on page 152
 – 5.11 “Comparison of GDPS XRC versus other GDPS offerings” on page 159, “Comparing GDPS GM to other GDPS offerings” on page 211
 – Chapter 9, “Combining local and metro continuous availability with out-of-region disaster recovery” on page 289
•Updated section 3.1.4, “Protecting other CKD data” on page 67, to reflect that GDPS/PPRC now provides foreign systems support for Linux on IBM Z running as a guest under KVM on IBM Z.
•Two sections are updated/added in support of the new Zero Data Loss specialized configuration for GDPS/Active-Active.
•Updated section 9.3.1, “GDPS MGM 3-site overview” on page 297, to remove a reference to the MGM Incremental Resynchronization Tool, which is no longer supported.
•Updated section 10.2.1, “Guest Linux under z/VM” on page 299, to reflect that GDPS will now automatically switch the dump volume pointers when an IBM HyperSwap occurs.
•The GDPS/PPRC, GDPS/PPRC HM, and GDPS Virtual Appliance web interfaces are no longer supported. All references have been removed.
•All occurrences of the term “Fixed Block Architecture” (FBA) have been removed or changed to “Fixed Block” (FB) for clarity.
•Several small changes have been made for clarity or to correct minor errors.
June 2016, Twelfth Edition
New and changed information
•Information regarding the GDPS/PPRC and GDPS/PPRC HM web interfaces has been refreshed in the following sections:
 – “Managing the GDPS/PPRC environment” on page 77.
 – “Managing the GDPS Metro HyperSwap Manager environment” on page 138.
This is due to the introduction of a new, modernized GDPS graphical user interface for those offerings.
•5.6.8, “Easy Tier Heat Map Transfer” on page 179 is new.
•6.6.4, “Easy Tier Heat Map Transfer” on page 207 is new.
•7.6.4, “Easy Tier Heat Map Transfer” on page 226 is new.
•The following sections are updated/added in support of the new GDPS/MGM Multi-Target 4-site solution:
 – 3.2.8, “Combining GDPS Metro with GDPS GM or GDPS XRC” on page 79.
 – 9.4, “GDPS Metro Global - GM 4-site solution” on page 305 is updated to describe the new GDPS/MGM 4-site with multi-target configuration.
 – 1.5, “GDPS offerings” on page 8.
 – 6.2.1, “GDPS/GM in a 3-site or 4-site configuration” on page 168.
 – 3.13, “Comparison of GDPS/PPRC versus other GDPS offerings” on page 98.
 – 4.11, “Comparison of GDPS Metro HyperSwap Manager to other GDPS offerings” on page 152.
 – 5.11, “Comparison of GDPS XRC versus other GDPS offerings” on page 176.
 – 6.11, “Comparing GDPS GM to other GDPS offerings” on page 211.
 – 3.13, “Comparing GDPS Metro to other GDPS offerings” on page 118.
•9.6, “GDPS Metro z/OS Global Mirror 4-site solution” on page 313 is new.
•Several small changes have been made for clarity or to correct minor errors.
June 2015, Eleventh Edition
New and changed information
•All references to the IBM TotalStorage 3494-based Virtual Tape Subsystem are removed, because these devices are no longer supported.
•GDPS/MTMM and the GDPS Virtual Appliance are added to 1.5, “GDPS offerings” on page 8.
•Chapter 3, “GDPS Metro” on page 55 is new.
•Several sections are updated in Chapter 2, “Infrastructure planning for availability and GDPS” on page 13, with information on MTMM and GDPS/MTMM.
•Chapter 8, “GDPS Virtual Appliance” on page 269 is new.
•Scenarios are added in Chapter 11, “Sample continuous availability and disaster recovery scenarios” on page 329.
•Section 3.4, “Management of z/OS systems outside of the GDPS sysplex” on page 75 is new.
•The following sections are updated:
 – 3.13, “Comparing GDPS Metro to other GDPS offerings” on page 118
 – 4.11, “Comparison of GDPS Metro HyperSwap Manager to other GDPS offerings” on page 152
 – 5.11, “Comparison of GDPS XRC versus other GDPS offerings” on page 176
 – 6.11, “Comparing GDPS GM to other GDPS offerings” on page 211
•Two subsections, 3.14, “Summary” on page 99 and 4.12, “Summary” on page 153, are updated with information related to the new GDPS/MTMM and GDPS Virtual Appliance offerings.
•References to GDPS Sysplex Timer (ETR) related processing are removed because support for the 9037 IBM Sysplex Timer has been discontinued.
•Several small changes have been made for clarity or to correct minor errors.
August 2014, Update to Tenth Edition
New and changed information
•New information about the GDPS/MGM 4-site solution is added to several sections:
 – 1.5, “GDPS offerings” on page 8
 – 3.2.5, “GDPS/PPRC in a 3-site or 4-site configuration” on page 74
 – 9.2.3, “Four-copy solutions” on page 296
 – 9.4, “GDPS Metro Global - GM 4-site solution” on page 305
•Where required, instances of GDPS/MGM and MGM were updated to indicate whether a 3-site or 4-site configuration is being referred to.
•Updated 9.3.8, “Flexible testing in a GDPS MGM 3-site environment” on page 303 to reference 6.7.2, “Creating a test copy using GM CGPause and testing on isolated disks” on page 209.
•GDPS/PPRC references to an Active/Active (single-site workload) and Active/Standby (multisite workload) configuration were changed and minor changes were made for clarification.
•Added GDPS/PPRC section, “GDPS use of IBM DS8000® functions” on page 63. Equivalent section “GDPS use of DS8000 functions” on page 129 was added.
•Added GDPS use of IBM DS8000 Soft Fence information to “Protecting secondary disks from accidental update” on page 65 and “Protecting secondary disks from accidental update” on page 131.
•Updated 3.2.5, “GDPS/PPRC in a 3-site or 4-site configuration” on page 74 to include MGM 4-site.
•New section 3.3.3 “IBM zEnterprise BladeCenter Extension (zBX) hardware management” on page 75 was added.
•Updated 10.2.1, “Guest Linux under z/VM” on page 299 with information regarding support for alternative subchannel sets to increase scalability.
•Added information about support for stand-alone servers and high availability options for the SA AppMan server to 10.3, “Distributed Cluster Management” on page 307.
•New section 10.3.4 ‘GDPS/PPRC Support for IBM xEnterprise BladeCenter Extension (zBX)” on page 329 was added.
•New section 6.7.2, “Creating a test copy using GM CGPause and testing on isolated disks” on page 209 was added.
•Updated the following sections:
 – 3.13, “Comparison of GDPS/PPRC versus other GDPS offerings” on page 98
 – 4.11, “Comparison of GDPS Metro HyperSwap Manager to other GDPS offerings” on page 152
 – 5.11, “Comparing GDPS XRC to other GDPS offerings” on page 182
 – 6.11, “Comparing GDPS GM to other GDPS offerings” on page 211
•New section, 5.6.6, “GDPS use of the XRC offline volume support” on page 178, was added.
•Several other small changes were made throughout the book for clarity or to correct minor errors.
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 added, “IBM InfoSphere® Data Replication for VSAM for z/OS” on page 38
 – Section added, “GDPS/PPRC co-operation with GDPS Continuous Availability” on page 97
 – Section updated, “What is a workload” on page 217
 – Section updated, “Considerations for other non-Active-Active workloads” on page 231
March 2013, Ninth Edition
New and changed information
•New section, “Addressing z/OS device limits in a GDPS GM environment” on page 36
•New section, “Scalability in a GDPS MGM 3-site environment” on page 302
•New section, “Scalability in a GDPS XRC environment” on page 32
•“Protecting tape data” on page 65 is updated to include information about the IBM TS7700 “in-doubt” tape support that is added in GDPS 3.10.
•“Region Switch” on page 171 extended to describe the different possible configurations when performing a GDPS region switch
•New section, “GDPS Query Services in a GDPS MGM 3-site environment” on page 304
•The following sections are updated with information about the GDPS/PPRC and GDPS/PPRC HM support of consistent IBM FlashCopy using the IBM FlashCopy Freeze capability of the disk subsystems:
 – “FlashCopy” on page 39
 – “GDPS/PPRC flexible testing and resync protection” on page 95
 – “GDPS Metro HyperSwap Manager flexible testing and resync protection” on page 149
•The following sections are updated with the GDPS Health Check management panel information:
 – “GDPS/PPRC health checks” on page 91
 – “GDPS Metro HyperSwap Manager health checks” on page 145
•Information about the legacy Freeze option is removed from the following sections:
 – “Protecting data integrity and data availability with GDPS/PPRC” on page 54
 – “Protecting data integrity and data availability with GDPS HM” on page 120
•The following new sections are added to describe add-on GDPS tools available for each of the GDPS products:
 – “GDPS tools for GDPS/PPRC” on page 96
 – “GDPS tools for GDPS Metro HyperSwap Manager” on page 150
 – “Services component” on page 181
 – “GDPS tools for GDPS GM” on page 210
•Some screen captures are refreshed.
•Several sections are renamed or reorganized for clarity.
•Several small changes were 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 61 is added to the GDPS/PPRC chapter. An equivalent section is added to the GDPS/HM chapter.
•3.6.1, “GDPS/PPRC health checks” on page 91 in Chapter 3, “GDPS Metro” on page 53, 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.
•4.5.1, “GDPS Metro HyperSwap Manager health checks” on page 145 in Chapter 4, “GDPS Metro HyperSwap Manager” on page 119, 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 “Reserve Storage Pool” has been added in Chapter 3, “GDPS Metro” on page 53 and in Chapter 4, “GDPS Metro HyperSwap Manager” on page 119.
•A new section “System Management actions” has been added in Chapter 3, “GDPS Metro” on page 53 to accommodate customer procedures to perform specific LOAD and RESET actions
•A new section “SYSRES Management” on page 90 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 4.4.2, “NetView commands” on page 143.
•A new section “Query Services” has been added to Chapter 5, “GDPS Global - XRC” on page 157. 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 164 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 5.6.5, “Vary-After-Clip automation” on page 177 has been added to Chapter 5, “GDPS Global - XRC” on page 157. 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 206 has been added in Chapter 6, “GDPS Global - GM” on page 185 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, so they do not need to be copied all the time.
•A new section 10.2, “GDPS Metro Multiplatform Resiliency for IBM Z” on page 299 has been added in 10.2, “GDPS Metro Multiplatform Resiliency for IBM Z” on page 299 to reflect the GDPS system management capabilities for IBM z/VM and Linux systems. GDPS controlled shutdown of z/VM (also referred to as a graceful shutdown) has also been included.
Changed information
•2.8, “Flexible server capacity” on page 44 in Chapter 2, “Infrastructure planning for availability and GDPS” on page 13 has been updated to reflect the enhanced GDPS CBU and On/Off Capacity on Demand (OOCoD) handling.
•Section “Addressing z/OS device limits in a GDPS Metro environment” in 2.4.1, “Metro Mirror” on page 23 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 “Metro Mirror and MTMM-based solutions” in 2.9, “Cross-site connectivity considerations” on page 45 is updated to include considerations about possible use of IBM HyperSwap with less than full bandwidth cross-site connectivity.
•Section “Sysplex resource management” in 3.5, “Managing the GDPS/PPRC environment” on page 77 has been updated to include GDPS Coupling Facility Management with a single CFRM policy.
•Section “GDPS HyperSwap function” in Chapter 3, “GDPS Metro” on page 53 and in Chapter 4, “GDPS Metro HyperSwap Manager” on page 119 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 DS8000 disk subsystems.
•5.6.2, “FlashCopy disk definition in the GDPS systems” on page 176 in Chapter 5, “GDPS Global - XRC” on page 157 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.
•10.2.1, “Guest Linux under z/VM” on page 299 in 10.2, “GDPS Metro Multiplatform Resiliency for IBM Z” on page 299 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.
•10.2.1, “Guest Linux under z/VM” on page 299 in 10.2, “GDPS Metro Multiplatform Resiliency for IBM Z” on page 299 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.
•10.2, “GDPS Metro Multiplatform Resiliency for IBM Z” on page 299 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.
•10.2, “GDPS Metro Multiplatform Resiliency for IBM Z” on page 299 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 39 and 3.1.2, “Protecting tape data” on page 65 has been updated to reflect the GDPS/PPRC support for configuration management of the IBM TS7700.
•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 and Stop Conditional processing.
•A new section Protecting secondary disks from accidental update has been added to Chapter 3, “GDPS Metro” on page 53 and to Chapter 4, “GDPS Metro HyperSwap Manager” on page 119.
•A new section “Automated response to STP sync WTORs” has been added to Chapter 3, “GDPS Metro” on page 53 and to Chapter 4, “GDPS Metro HyperSwap Manager” on page 119.
•New sections “STP CTN role reassignments: Planned operations” on page 86, “STP CTN role reassignments: Unplanned failure” on page 89, and “STP WTOR IEA394A response: Unplanned failure” on page 89 have been added to Chapter 3, “GDPS Metro” on page 53. 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 “Concurrent Copy cleanup” has been added to Chapter 3, “GDPS Metro” on page 53 and to Chapter 4, “GDPS Metro HyperSwap Manager” on page 119.
•A new section 4.4.2, “NetView commands” on page 143 has been added to Chapter 4, “GDPS Metro HyperSwap Manager” on page 119 to describe the HYPERSW command and the new GDPSTIME command to reassign roles in an STP-only CTN.
•Two new sections have been added to Chapter 5, “GDPS Global - XRC” on page 157. They describe miscellaneous enhancements that improve scalability, management, and data consistency for GDPS/XRC.
•Two new sections have been added to Chapter 6, “GDPS Global - GM” on page 185. They describe new capabilities in GDPS/GM that improve system management and availability through autonomic capabilities.
•A new chapter, Chapter 7, “GDPS Continuous Availability solution” on page 215 is added to describe the GDPS/Active-Active solution.
•A new section 10.2.4, “Customization Verification Program” on page 306 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 IBM Z environments.
•A new section 10.2.5, “xDR Extended Monitoring” on page 307 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 Procedure Handler” has been added to Chapter 9, “Combining local and metro continuous availability with out-of-region disaster recovery” on page 289 to describe its function 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 (FB) data” on page 66 has been updated to add support for SCSI attached FB disk used by native Linux on IBM Z systems under GDPS xDR control.
•Section “Improved controlling system availability: Enhanced STP support” has been updated in Chapter 3, “GDPS Metro” on page 53 and Chapter 4, “GDPS Metro HyperSwap Manager” on page 119 to indicate under what conditions WTORs IEA015A and IEA394A are posted.
•Section “Flexible testing” has been updated in Chapter 5, “GDPS Global - XRC” on page 157 to indicate changes in IBM Zero Suspend FlashCopy support.
•Section 10.1, “FB disk management function” on page 296 was updated to include support for SCSI attached FB disk used by native Linux IBM Z under GDPS xDR control.
•Section 10.2, “GDPS Metro Multiplatform Resiliency for IBM Z” on page 299 was reformatted to include separate sections 10.2.1, “Guest Linux under z/VM” on page 299 and 10.2.2, “Native Linux on IBM Z” on page 303 and updated to include support for SCSI-attached FB disk used by native Linux on IBM Z 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 IBM Z.
•Added references to Microsoft Windows clusters (particularly in “Integrated configuration of GDPS GM and VCS clusters” on page 313) 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. The overview of the GDPS family of offerings was also 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 54 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 Metro HyperSwap Manager” on page 119.
•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® 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 343 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 “Combining disk remote copy technologies for CA and DR” on page 36 has been added to Chapter 2, “Infrastructure planning for availability and GDPS” on page 13.
•A new section “Improved controlling system availability: Enhanced STP support” on page 69 has been added to Chapter 3, “GDPS Metro” on page 53, and to Chapter 4, “GDPS Metro HyperSwap Manager” on page 119.
•A new section “GDPS/PPRC in a 3-site or 4-site configuration” has been added to Chapter 3, “GDPS Metro” on page 53 and to Chapter 4, “GDPS Metro HyperSwap Manager” on page 119.
•A new section “GDPS/PPRC management of distributed systems and data” has been added to Chapter 3, “GDPS Metro” on page 53.
•A new section “GDPS/PPRC monitoring and alerting” has been added to Chapter 3, “GDPS Metro” on page 53, to Chapter 4, “GDPS Metro HyperSwap Manager” on page 119, to Chapter 5, “GDPS Global - XRC” on page 157, and to Chapter 6, “GDPS Global - GM” on page 185.
•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.
•A new section, “Disk and LSS sharing” on page 302 has been added to Chapter 10, “GDPS extensions for heterogeneous systems and data” on page 295.
•A new section, “Integrated configuration of GDPS GM and VCS clusters” on page 313 has been added to Chapter 10, “GDPS extensions for heterogeneous systems and data” on page 295.
•A new section, “Summary” on page 319 has been added to Chapter 10, “GDPS extensions for heterogeneous systems and data” on page 295.
Changed information
•2.1.2, “Multisite sysplex considerations” on page 15 was updated to change the maximum fiber distance from 100 km to 200 km (with RPQ).
•2.4.3, “Global Mirror” on page 33 was rewritten.
•2.8.1, “Capacity Backup upgrade” on page 44 and 2.8.2, “On/Off Capacity on Demand” on page 44 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 45 to reflect the recently available Parallel Sysplex InfiniBand technology for coupling and STP and HMC connectivity requirements for STP.
•2.9.7, “Connectivity options” on page 49 was updated.
•9.3, “GDPS Metro Global - GM 3-site solution” on page 297 and 9.5, “GDPS Metro Global - XRC 3-site solution” on page 308 have been updated to include the Incremental Resynchronization function.
•Chapter 3, “GDPS Metro” on page 53 and Chapter 4, “GDPS Metro HyperSwap Manager” on page 119 were restructured to introduce concepts in 3.1.1, “Protecting data integrity and data availability with GDPS/PPRC” on page 54 before the discussion of configurations in 3.2, “GDPS/PPRC configurations” on page 68 and 4.2, “GDPS Metro HyperSwap Manager configurations” on page 133.
•“HyperSwap policy (Primary Failure policy) options” on page 61 was added.
•Tables provided in Chapter 3, “GDPS Metro” on page 53, Chapter 4, “GDPS Metro HyperSwap Manager” on page 119, Chapter 5, “GDPS Global - XRC” on page 157, and Chapter 6, “GDPS Global - GM” on page 185 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 20, was added to explain the business impact of using Synchronous and Asynchronous remote copy technologies.
•A new chapter, Chapter 9, “Combining local and metro continuous availability with out-of-region disaster recovery” on page 289, discusses the GDPS/MGM and GDPS/MzGM offerings.
•Multiplatform for IBM 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 enables use 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 Metro” on page 53.
•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.
 
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