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| Oracle Solaris Cluster Geographic Edition Overview

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## Data Replication

Data replication enables controlled migration of production services from a primary cluster to a secondary cluster either in the event of a disaster or as part of a planned procedure. Data is continuously replicated from the primary cluster to the secondary cluster either synchronously or asynchronously, or a combination of both, depending on the recover point objectives of the application services that are supported by the clusters.

The Geographic Edition software supports the following software for data replication:

- EMC Symmetrix Remote Data Facility software

- Hitachi TrueCopy software

- Hitachi Universal Replicator software

- MySQL software

- Oracle Data Guard software (for use with Oracle Database and Oracle RAC only)

- Oracle Solaris Cluster Geographic Edition script-based plug-ins

- StorageTek Availability Suite software

StorageTek Availability Suite software uses a host-based data replication facility which replicates data at the file system or logical volume level within the operating system. Hitachi TrueCopy and Universal Replicator software and EMC Symmetrix Remote Data Facility software use a storage-based data replication facility which replicates data at the storage system level and provides a transparent service to applications. Oracle Data Guard software and MySQL software are application-based data replication facilities that maintain one or more standby databases as synchronized replicas of a production database.

### EMC Symmetrix Remote Data Facility Software

EMC Symmetrix Remote Data Facility software provides remote storage replication for disaster recovery and ensures data and systems availability through remote site failover. EMC Symmetrix Remote Data Facility devices are configured in pairs. The mirroring relationship between the pairs becomes operational as soon as the EMC Symmetrix Remote Data Facility links are online. The EMC Symmetrix Remote Data Facility global memory stores information about the pair state of operating EMC Symmetrix Remote Data Facility devices. For information about EMC Symmetrix Remote Data Facility software, see the product documentation.

### Hitachi TrueCopy and Universal Replicator Software

Hitachi TrueCopy and Universal Replicator software is a storage-based replication facility that provides a host-independent data replication for geographically separated clusters. Hitachi TrueCopy and Universal Replicator software enables the primary volumes to remain online for all hosts and while processing both read and write I/O operations. If a disaster or system failure occurs, the secondary copy of the data can be run for a recovery with minimal loss of data. For more information about Hitachi TrueCopy and Universal Replicator software, see the product documentation.

### Oracle Data Guard Software

Oracle Data Guard software is an application-based replication facility that maintains one or more standby databases as synchronized replicas of a production database. Geographic Edition supports the use of Oracle Data Guard replication only with Oracle Database and Oracle RAC.

You add an Oracle Data Guard Broker configuration that is controlled by the Oracle Data Guard software to a protection group. The Geographic Edition software creates a shadow Oracle server proxy resource group for each Oracle Data Guard Broker configuration. The shadow Oracle server proxy resource group “shadows” the real Oracle database server resource group to manage and monitor the Oracle RAC databases that are under the control of Oracle Solaris Cluster software. For more information about Oracle Data Guard software, see the product documentation.

### StorageTek Availability Suite Software

StorageTek Availability Suite software is a host-based replication facility that replicates disk volumes between geographically separated primary clusters and secondary clusters in real time. Remote mirror replication enables data from the master volume of the primary cluster to be replicated to the master volume of the geographically separated secondary cluster through a TCP/IP connection. A remote mirror bitmap tracks differences between the master volume on the primary disk and the master volume on the secondary disk.

The remote mirror software continually replicates the data to remote sites while your applications are accessing the data volumes. You can also manually update the data on the secondary site volume by issuing a command to synchronize the primary and secondary site volumes. You can also restore data from the secondary volume to the primary volume by issuing a command to reverse-synchronize the volumes. For more information about StorageTek Availability Suite software, see the product documentation.

### Resource Groups

Resource groups and device groups enable the Geographic Edition software to manage data replication and takeover between clusters. You can also configure a protection group to replicate data from a primary cluster to a secondary cluster. For more information about configuring data replication, see the guide for the data replication product you are using:

- Chapter 1, Replicating Data With Sun StorageTek Availability Suite Software, in Oracle Solaris Cluster Geographic Edition Data Replication Guide for Sun StorageTek Availability Suite

- Chapter 1, Replicating Data With Hitachi TrueCopy and Universal Replicator Software, in Oracle Solaris Cluster Geographic Edition Data Replication Guide for Hitachi TrueCopy and Universal Replicator

- Chapter 1, Replicating Data With EMC Symmetrix Remote Data Facility Software, in Oracle Solaris Cluster Geographic Edition Data Replication Guide for EMC Symmetrix Remote Data Facility

- Chapter 1, Replicating Data With Oracle Data Guard Software, in Oracle Solaris Cluster Geographic Edition Data Replication Guide for Oracle Data Guard

#### Replication Resource Groups

The Geographic Edition software extends Oracle Solaris Cluster resource management features to integrate the data replication products. When you configure a protection group, the Geographic Edition software creates replication resource groups for monitoring and controlling data replication.

#### Device Groups

A device group is a hardware resource that Oracle Solaris Cluster manages. A device group is a type of global device that the Oracle Solaris Cluster software uses to register volume manager disk groups. The Geographic Edition software configures Oracle Solaris Cluster device groups to include replication. For information about configuring device groups in Oracle Solaris Cluster, see the guide for the data replication product you are using.

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