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|Oracle Solaris Cluster Geographic Edition Overview Oracle Solaris Cluster 4.1|
This section provides the following information:
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:
The Availability Suite feature of Oracle Solaris
EMC Symmetrix Remote Data Facility software
Oracle Data Guard software (for use with HA for Oracle and Oracle RAC only)
Sun ZFS Storage Appliance from Oracle
Geographic Edition script-based plug-ins
Sun Availability Suite uses a host-based data replication facility which replicates data at the file system or logical volume level within the operating system. EMC Symmetrix Remote Data Facility software and Sun ZFS Storage Appliance 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.
The Sun Availability Suite feature of Oracle Solaris 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 Sun Availability Suite, see the Availability Suite man pages such as dscfg(1M).
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.
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 RAC and HA for Oracle data services.
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 RAC server proxy resource group for each Oracle Data Guard Broker configuration, regardless of whether you use Oracle RAC or HA for Oracle. The shadow RAC server proxy resource group “shadows” the real Oracle RAC server proxy resource group or HA for Oracle resource group to manage and monitor the Oracle databases that are under the control of Oracle Solaris Cluster software. For more information about Oracle Data Guard software, see the product documentation.
Sun ZFS Storage 7000 appliances support snapshot-based replication of projects and shares from a source appliance to any number of target appliances manually, on a schedule or continuously. The replication includes both data and metadata. Remote replication, or just replication, is a general-purpose feature optimized for disaster recovery, data distribution, disk-to-disk backup and data migration. For more information about Sun ZFS Storage 7000 appliances, see the product documentation.
This section provides the following information:
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:
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.
A device group is a hardware resource that Oracle Solaris Cluster software 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 configurations, see the guide for the data replication product you are using.