Enhancements to IBM Geographically Dispersed Parallel Sysplex (GDPS)

IBM United States Services Announcement 610-018
March 23, 2010

 ENUS610-018.PDF (60KB)

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At a glance
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Geographically Dispersed Parallel Sysplex™ (GDPS®) V3.7 enhances your system infrastructure availability and disaster recovery solution across your entire data center.

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GDPS V3.7 enhances the industry-leading continuous availability and disaster recovery (CA/DR) automation provided by GDPS by extending the support for managing heterogeneous platforms, and continuing to exploit the advanced data replication technologies of IBM® System Storage™ DS8000™ to provide faster backup/restore solutions and improved ease of use. The benefits that can be achieved through new GDPS V3.7 functions are:

  • Improved cross-platform support:
    • Distributed Cluster Management (DCM) support extended to Microsoft® Windows® clusters
    • Linux® on System z® integration with GDPS
    • HyperSwap™ I/O timing triggers for z/VM® and z/VM guests
    • SUSE SLES 11 support
  • Improved scalability:
    • UCB constraint relief with Metro Mirror secondary devices in an alternate subchannel set
  • Increased availability:
    • GDPS/MGM resynchronization reduced from hours down to minutes
    • Low-impact initial copy and resynchronization extended to distributed LUNs
  • Simplified system management:
    • Simpler installation with fewer manual definitions
    • Additional GDPS Health Checks
    • Additional Query Service options

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Key prerequisites
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A complete description of the GDPS prerequisites can be found at


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Planned availability date
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  • March 31, 2010, for:
    • RCMF/PPRC V3.7
    • GDPS/PPRC V3.7
    • GDPS/PPRC HyperSwap Manager V3.7
    • RCMF/XRC V3.7
    • GDPS/XRC V3.7
    • GDPS/Global Mirror V3.7
    • GDPS Metro/Global Mirror V3.7
    • GDPS Metro/z/OS Global Mirror V3.7
  • June 30, 2010, for:
    • GDPS/MGM Incremental Resynchronization tool
    • Linux on System z integration enhancements
    • Distributed Cluster Management (DCM) support extended to Microsoft Windows clusters
    • SUSE SLES11 support

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GDPS V3.7 offers the following:

  • Improved cross-platform support:
    • GDPS Distributed Cluster Management (DCM) support extended to Windows clusters. This allows GDPS, together with Veritas Cluster Server (VCS), to coordinate disaster recovery actions when VCS is managing Windows servers as well as servers running IBM AIX®, Sun Solaris, HP-UX, or Linux. With this support, GDPS together with VCS can provide a single disaster recovery plan for all major platforms. In addition, they can manage the clusters for planned activities such as D/R testing. Additional information on DCM including support for Tivoli® System Automation Application Manager can be found in GDPS Family - An Introduction to Concepts and Capabilities at
  • GDPS enhancements for Linux on System z:
    • Linux on System z integration with GDPS provides HyperSwap capability to the Linux environment with a single consistency group with z/OS® to support multi-tiered applications. Multiple enhancements for this environment, called Multiplatform Resiliency for System z, also known as xDR, include:
      • HyperSwap I/O timing triggers for z/VM and z/VM guests. GDPS now supports an I/O timing trigger capability for z/VM as well as z/VM guests, including Linux guests, when I/O response time objectives are not met. This function provides the equivalence of IOT for z/VM, providing protection for the z/VM and its guests.
      • Automation extensions to allow a graceful startup and shutdown of z/VM and z/VM guests. This can avoid timeouts which require manual interactions.
      • GDPS V3.7 is extending the support to SUSE SLES11.
  • Improved scalability:
    • UCB constraint relief with GDPS/PPRC and GDPS/PPRC HM support for secondary devices on an alternate subchannel set. This effectively doubles the amount of usable UCBs from approximately 32K to 64K devices. GDPS/PPRC and GDPS/PPRC HyperSwap Manager can now support the definition of Metro Mirror secondary disk devices using subchannels in an alternate subchannel set. Using alternate subchannel sets can help provide scalability for larger disk configurations.
  • Increased availability with:
    • The GDPS Metro/Global Mirror (MGM) Incremental Resynchronization tool extends the existing GDPS support to include reintroduction of the intermediate site without full volume copies. By copying only changed tracks to the recovery site instead of requiring a full-volume copy, the time required to reestablish the intermediate site can be greatly improved. This potentially reduces the time you would be without HyperSwap and/or synchronous mirroring from hours down to minutes. MGM is a cascading mirroring solution. Metro Mirror is used to synchronously replicate data between a primary and secondary disk subsystem located either within a single data center or between two data centers located within metropolitan distances, and can provide HyperSwap capability for near-continuous data availability with zero RPO. Global Mirror is used to asynchronously replicate data from the secondary disk to a third disk system located in a recovery site an unlimited distance away to provide protection from regional events. GDPS/MGM supports both z/OS and open fixed-block architecture data formats.
    • Low-impact initial copy and resynchronization has been extended to distributed LUNs. GDPS V3.6 includes low-impact initial copies and resynchronization of Metro Mirror volumes. This allowed the initial copy or resynchronization operation to be performed even in the middle of first shift with negligible performance impact to the production workload. Not scheduling this off-shift reduced the exposure window where the environment is without Freeze or HyperSwap protection, protecting the consistency group and providing near-continuous availability. This capability is being extended to distributed LUNs.
  • Simplified system management:
    • Simpler installation with fewer manual definitions. Through synergistic functions, GDPS and SA are designed to determine how many batch operators are needed and to be able to define them. These batch automation operators no longer need to be defined in the SA policy database, eliminating unnecessary manual installation definitions.
    • GDPS V3.7 supports additional query service options to display information on the GDPS environment and the HyperSwap environment. This can help validate that GDPS was started with the startup options expected and can simplify problem determination.
    • Additional GDPS Health Checks. These Health Checks are designed to:
      • Ensure the controlling system has sufficient CPU capacity
      • Verify the GDPS/XRC System Data Mover LPARs have enough CPU and memory capacity

GDPS V3.7 addresses the following user requirements:

  • GDPS Design Council requirements GEO-015, GEO-042, GEO-048, GEO-103, GEO-137, GEO-171, GEO-197, GEO-233, GEO-263, GEO-276, GEO-295, and GEO-297
  • FITS requirements MR0212091353, MR 84396227000, and PTDB1004-738
  • Clearquest requirements 1163, 1896, and 1910

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Statement of direction
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IBM plans to make available the following functions:

  • IBM intends to support additional freeze policy options. This will allow more control over GDPS/PPRC and GDPS/PPRC HyperSwap Manager actions after disk subsystem events.
  • IBM intends to enhance z/VM with the ability to generate time-stamps on all guest and system disk I/O operations, and provide limited (host-only) exploitation of the Server Time Protocol (STP) facility to ensure time consistency. These capabilities will allow z/VM to participate in GDPS solutions (GDPS/XRC and GDPS Metro/z/OS Global Mirror (GDPS/MzGM)) that use the IBM System Storage z/OS Global Mirror asynchronous mirroring technology.

Note: These statements represent the current intention of IBM. IBM development plans are subject to change or withdrawal without further notice. Any reliance on this statement of direction is at the relying party's sole risk and does not create any liability or obligation for IBM.

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For additional information and current prices, contact your local IBM representative.


Geographically Dispersed Parallel Sysplex, System Storage, DS8000 and HyperSwap are trademarks of IBM Corporation in the United States, other countries, or both.

GDPS, IBM, System z, z/VM, AIX, Tivoli and z/OS are registered trademarks of IBM Corporation in the United States, other countries, or both.

Microsoft and Windows are registered trademarks of Microsoft Corporation in the United States, other countries, or both.

Linux is a registered trademark of Linus Torvalds in the United States, other countries, or both.

Other company, product, and service names may be trademarks or service marks of others.

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