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 Continentalclusters Version A.05.01 Release Notes: > Chapter 1 Continentalclusters Version A.05.01 Release Notes

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Continentalclusters employs semi-automatic failover of Serviceguard packages from one cluster to another following a cluster event that indicates serious disruption of service on one of the clusters. The product consists of a set of configuration, management commands, and a set of daemons that monitors and sends notification of cluster events

The A.05.01 version contains the following enhancements:

Continentalclusters Product Features

The Continentalclusters product has the following basic features:

  • Continentalclusters works with any type of data replication. A set of guidelines for integrating your data replication technology can be found in chapter 4 of the Designing Disaster Tolerant High Availability Clusters user’s guide on: http://www.docs.hp.com/en/ha.html

    Continentalcluster provides a pre-integrated data replication solution using HP StorageWorks Continuous Access XP, Continuous Access EVA or EMC/SRDF with the separately purchased products Metrocluster CA XP, Metrocluster Continuous Access EVA, and Metrocluster with ECM SRDF. An alternative to using the pre-integrated data replication solution a customer-selected data replication solution can be chosen by following the integration guidelines.

  • A recovery pair in a Continentalclusters consists of one primary cluster and one recovery cluster. One or more recovery pairs can be configured in a continental cluster with a common recovery cluster. Failover of a specific package occurs in one direction from the primary cluster to the recovery cluster. Each data center can serve as both primary and recovery cluster for different packages. In the cascading failover configuration, the primary cluster can be a metropolitan cluster using EMC/SRDF or CA XP.

  • Logical data replication is also possible using the Oracle Standby Database. Template files and additional information are included in the Oracle Standby Database portion of the Enterprise Cluster Master Toolkit product (a separately purchased product). Other customer-selected logical data replication solutions can be implemented as well.

  • Cluster monitoring is carried out over WAN connections. Use any WAN connection; however, some data replication methods may require high speed connections such as T1, T3, E3/ES or ATM leased lines or switched lines.

NOTE: Continentalclusters can co-exist with the Advanced Tape Services (ATS) feature of Serviceguard. However, an ATS package must not be configured as a Continentalclusters package. With ATS, a single tape drive (or set of tape drives) is shared between two nodes within a cluster of up to four nodes. All of the tape drives are located within a single data center. If the power were to be lost, the tape drives would not be accessible even if the package were to be failed over to the other data center with a Continentalclusters package. Therefore, using ATS in a Continentalclusters package is not practical.

Support for Oracle 10g RAC Database Instance Recovery

Upon failure of the primary cluster, the Oracle 10g RAC database instance, configured to be running on the primary cluster, will be recovered on the recovery cluster. This feature is supported for the environment using SLVM for volume management and CA XP, or CA EVA, or EMC SRDF for data replication between the Serviceguard clusters. The corresponding Metrocluster products Metrocluster CA XP, or Metrocluster CA EVA, or Metrocluster with EMC SRDF is required.

Support for Asynchronous Mode using EMC/SRDF

The Continentalclusters environment supports configuration with EMC SRDF/Asynchronous mode for data replication. SRDF/Asynchronous provides a long-distance replication solutions with minimal impact on performance. This protection level is intended for customers requiring minimal host application impact, but need to maintain a restartable copy of data at target (R2) site. In an environment using SRDF for data replication, when a disaster occurs at the source (R1) site, a consistent point-in-time copy of data is retained on the target side.Metrocluster SRDF version A.05.00 is required. Refer to the Metrocluster with EMC SRDF Version A.05.00 Release Notes for configuration and support detail.

Support for HP StorageWorks XP12000 CA Journal 1:1 Data Replication

Continentalclusters supports the environment configured with HP StorageWorks XP12000 CA Journal 1:1 data replication. Continuous Access XP Journal is an asynchronous data replication between two HP XP12000 storage disk arrays. CA Journal uses two main features; “disk-based journaling” and “pull-style replication”. These two features reduce XP12000 internal cache memory consumption, while maintaining performance and operational resilience.

Metrocluster CA XP version A.05.00 is required. Refer to the Metrocluster with Continuous Access XP Version A.05.00 Release Notes for configuration and support detail.



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