Storage agents

A disaster recovery solution requires an organized storage management because storage is a vital entity in any data center. The GDR solution relies on data replication from the active site to the backup site.

In the GDR solution, the data is replicated from the active site to the backup site by using storage replication. Depending on the type of storage devices in your environment, the initial storage configuration might involve installation of the storage controller software that is used to perform replication operations. The general storage management operations include starting, stopping, suspending, reversing, resyncing, pausing, and resuming the replication. For more information about installation of storage controller software, see the documentation from the storage vendor.

The following figure shows an example of storage device configuration in a site.

Figure 1. Storage device configuration in a site

The following figure shows an example of mapping storage devices across the active site and the backup site.

Figure 2. Storage replication across sites

After the initial storage setup, you must add a storage agent to the KSYS configuration that interacts with the storage subsystem. If you have a storage controller software, the storage agents interact with the storage controller to perform storage-specific operations in the disks.

The storage subsystem uses the following components for configuration and recovery operations:

Storage controller: A node that contains the software to manage the interaction between the disks and the hosts that are connected to the storage.
Disk group: Indicates a group of disks within a site.
Consistency group: Indicates a group of storage devices from multiple storage arrays to maintain the consistency of data. For more information about consistency groups, see Consistency groups.
Disk pair: Indicates the set of disks or disk groups that are paired across the sites for disaster recovery.