IBM HACMP/XD expands its business continuity solution with improved, simpler geographic-distance data mirroring and disaster recoveryIBM United States Software Announcement 205-085
April 12, 2005
|Table of contents||Document options|
|At a glance|
HACMP/XD (Extended Distance) Geographic Logical Volume Manager (GLVM) delivers enhanced business continuity support via:
- Simple, easier-to-use mirroring and resynchronization of your mission-critical data
- Unlimited-distance real-time data mirroring for AIX 5L logical volumes
- Automated disaster recovery
- Automated failover, recovery, and re-synchronization of application data to production resources
- Simple, easy-to-use interface
- Strategic replacement for HACMP/XD "HAGEO" IP mirroring
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HACMP/XD GLVM is a new, software-based technology for mirroring mission-critical data over standard TCP/IP networks. HACMP/XD GLVM, IBM's solution for geographic backup and disaster recovery for IBM pSeries® servers, supports AIX® 5L logical volumes to help keep your business running. HACMP/XD GLVM is simpler and easier to use than the existing HACMP/XD HAGEO software-based technology and is better suited to the application workloads that typically run on today's pSeries servers.
HACMP/XD GLVM helps you maintain business continuity via real-time data mirroring and automated failover/failback. That means near-instantaneous disaster recovery and availability for your mission-critical applications.
HACMP/XD GLVM exploits IP to enable one or two copies of an AIX 5L logical volume to be located at a remote site separated by unlimited distance, thus allowing for automated failover to that remote site with minimal risk of loss of any data. HACMP/XD GLVM can manage replication, synchronization, and recovery of new or existing AIX 5L logical volumes. With the new, easier-to-use interface, the complexities of managing HAGEO mirror copy synchronization are replaced by the existing LVM functions of AIX 5L.
HACMP V5 provides an excellent high availability solution for pSeries servers, providing automated failover and failback within a local site. HACMP/XD takes the business-critical function provided by HACMP V5 and extends it by adding remote data mirroring and supporting failover and failback to sites at unlimited distances.
When you include HACMP/XD, nothing can stop your business.
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HACMP V5.2 on AIX 5L V5.3
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|Planned availability dates|
- April 15, 2005: With requisite AIX 5L V5.3 PTFs
- May 6, 2005: For integrated AIX 5.3 and pre-install images
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New GLVM function of HACMP/XD
The HACMP/XD product provides several high availability technologies that extend the business-critical reliability function provided by HACMP V5 to support sites that are geographically distant from each other. Previously, HACMP/XD included Peer-to-Peer Remote Copy (PPRC) and IP-based mirroring (HAGEO).
HACMP/XD Geographic Logical Volume Manager (GLVM) is a new IP-based mirroring technology. HACMP/XD GLVM data replication is built upon AIX 5L's Logical Volume Manager (LVM), using it to drive replication and synchronization of AIX logical volumes. HACMP/XD takes the business-critical function provided by HACMP V5 and extends it to support sites that are geographically distant from each other.
HACMP/XD GLVM supplements, and is intended to replace, the current HACMP/XD HAGEO IP-based mirroring function. HACMP/XD GLVM provides essentially the same function with greater usability, reliability, and performance. HACMP/XD GLVM is integrated with AIX 5L's LVM instead of being separate from it, as with current HACMP/XD HAGEO IP-based mirroring. As a result, the HACMP/XD GLVM user need not size, create, nor manage separate "state maps" as previously required with the current HACMP/XD "HAGEO" IP-based mirroring.
Because of its tight integration with LVM, the HACMP/XD GLVM user need only configure an AIX remote pseudo-device driver to define the remote physical volume; the complexities of managing HACMP/XD state maps and mirror copy synchronization are handled by the existing LVM functions of AIX 5L. The HACMP/XD GLVM user needs to configure geographically distant disks as "remote physical volumes" and then combine those remote physical volumes with local physical volumes to form "geographically mirrored volume groups," which are managed by the AIX 5L LVM just like ordinary volume groups. Users who are already familiar with HACMP and AIX 5L LVM should find HACMP/XD GLVM easy to learn.
HACMP/XD GLVM enables one or two copies of an AIX logical volume to be located at remote sites separated by unlimited remote distances, thus allowing automated failover to and failback from that remote site without loss of data.
HACMP V5 provides an excellent high availability solution for pSeries servers, providing automated failover and failback within a local site. Support for Dynamic LPARs, Capacity Upgrade on Demand (CUoD), and Capacity Backup (CBU) is included for POWER4 and POWER5 (APAR service required). With the addition of HACMP/XD in all its forms (Peer-to-Peer Remote Copy [PPRC], HAGEO, and GLVM), it provides customizable, easy-to-use data mirroring and availability services between PPRC sites or geographically distant sites or logical volumes connected by a standard IP-based network. The PPRC and HAGEO functions of HACMP/XD remain unchanged.
In Appendix C of the HACMP/XD for Geographic LVM Planning and Administration Guide , HACMP/XD for GLVM and HAGEO are compared in terms of mapping of their components, terminology, major functions, and configuration. Also, a migration procedure from HAGEO to HACMP/XD for GLVM is included. Customers who are currently using HAGEO and are planning a switch to HACMP/XD for GLVM should refer to this guide.
For a complete description of IBM high availability solutions and products, and the many ways that these products can help protect your business, go to
Note: For current HAGEO customers, note the following and refer to the Statement of general direction for additional information:
- Support for concurrent mode volume groups, such as Oracle multi-node concurrent access, is not yet available.
- Remote data mirroring is currently limited to a single network connection per node.
- HACMP/XD for GLVM runs only on HACMP/XD V5.2 (with HACMP APAR IY66555) on AIX 5L V5.3 with Recommended Maintenance Package 5300-02 or APARs IY68029 and IY68300.
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The prospective customer for HACMP/XD solutions is any enterprise or organization with requirements to keep business-critical applications and systems operational 7 days per week, 24 hours per day. An HACMP solution provides the means to recover from any unplanned server hardware or application failures, and also gives you the means to take down an individual server (node) for planned maintenance and upgrades without having to take down the entire cluster.
High availability and business continuity is a growing business need across all industries. HACMP and HACMP/XD are designed to help protect you from loss of data or services during planned or unplanned outages. The following industries are prime candidates and opportunities for HACMP solutions:
The HACMP/XD feature is a must for clients with business-critical data who want to mirror data between separate sites to enable and automate cross-site disaster recovery and failover. This applies to businesses of any size, with multiple sites or regional operations, or wherever decentralization of data is desired. HACMP/XD is an attractive, affordable high availability solution for small and medium-sized enterprises, and for small and medium-sized business units of large enterprises. High availability should be a fundamental buying criterion for business-critical and on demand applications.
In addition to providing high availability, HACMP can also be configured to provide loosely coupled multiprocessing services. These configurations allow workloads to be spread across multiple pSeries systems, sharing the disk and processor resources of the clustered nodes. This clustered approach, along with the capability of application failover and recovery/restart of the HACMP V5 configured machine, offers additional levels of high availability processing for customer-critical environments. The Concurrent Resource Manager function of HACMP provides an open API that applications can utilize to get concurrent access to a shared disk.
Positioning of HACMP relative to other cluster servers: HACMP is a robust offering for mission-critical availability for up to 32 nodes. It is IBM's strategic high availability offering designed and tuned for pSeries servers running AIX 5L.
Advantages of HACMP relative to competitive products:
- HACMP provides a broader range of configuration options over all supported platforms, including a greater number of nodes (32), node interconnect protocols, storage systems, and disk interconnects, allowing increased flexibility of configurations.
- HACMP is cluster technology proven over a decade of service.
- A rich skills base has developed in the industry for implementation and support of HACMP.
- HACMP supports pSeries servers with the most advanced autonomic features in the industry. pSeries reduces downtime and support costs.
- HACMP is fully aligned with IBM's On Demand Business strategy to deliver necessary IT infrastructure to meet constantly changing business needs.
Positioning of HACMP/XD relative to other data mirroring or disaster recovery solutions: HACMP/XD is a robust offering for mission-critical availability for up to 32 nodes. It is IBM's strategic business continuity offering designed and tuned for pSeries servers running AIX 5L.
Advantages of HACMP/XD relative to competitive products:
- HACMP/XD provides a broader range of configuration options over all supported platforms, including a greater number of nodes (32), node interconnect protocols, storage systems, and disk interconnects, allowing increased flexibility of configurations.
- HACMP/XD leads the industry in unlimited-distance geographic clustering to support data mirrors and disaster recovery.
- HACMP/XD is a logical, cohesive extension of existing HACMP V5 installations.
- HACMP/XD with GLVM provides easy-to-use, reliable remote copies, backups, and automated recovery of AIX logical volumes.
- HACMP/XD with PPRC provides easy-to-use, reliable local copies, backups, and automatable recovery of supported storage subsystems.
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|Statement of general direction|
To enable HACMP/XD GLVM as the strategic replacement for IBM HAGEO, IBM intends to enhance HACMP/XD GLVM with the following functions by third quarter 2006:
- GLVM support for concurrent mode volume groups (for example, Oracle multi-node concurrent access)
- GLVM support for remote logical volume mirroring via multiple network connects per node
All statements regarding IBM's plans, directions, and intent are subject to change or withdrawal
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For complete information and description of HACMP V5 and HACMP/XD, refer to Software Announcement 204-133 , dated June 22, 2004.
Business Partner information
If you are a Direct Reseller - System Reseller acquiring products from IBM, you may link directly to Business Partner information for this announcement. A PartnerWorld ID and password are required (use IBM ID).
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The GLVM function is included with the latest level of 5765-F62 HACMP/XD.
New customers need to order the 5765-F62 HACMP/XD optional billing feature number 0003 and 5692-A5L SPO media feature number 0997. Contact your IBM representative for the full range of billing options.
Existing customers need only to reorder 5692-A5L SPO media feature number 0997.
Customized offerings: Most product media is shipped only via customized offerings (that is, CBPDO, ServerPac, and SystemPac®). Non-customized items (CDs, diskettes, source media, and media kits) will continue to be shipped via the stand-alone product.
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