HP D2D4009fc HP D2D Backup System Concepts guide (EH985-90915, March 2011) - Page 20
Replication concepts and terminology, Replication elements
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Replication concepts and terminology When configuring appliances for replication, there are some key concepts and terminology that it is important to understand. Replication elements • Source Appliance: This is the StoreOnce Backup System with the NAS share or library device that is being used for backup by a host server. The NAS share contains data files that need to be replicated; the library device contains slots that need to be replicated. • Target Appliance: This is the StoreOnce Backup System with the NAS share or library device that contains the replicated data; it is an exact match of the NAS share or library on the source HP StoreOnce Backup System. This appliance needs a replication license. • Non-Replicating Device: This describes a NAS share or library on a StoreOnce Backup System that has not been configured as a source or target for replication. • Replication-Source Device: This describes the NAS share or library on a StoreOnce Backup System that has been configured for backups from a host server and has also been configured for replication. Replication-Source shares and libraries are visible to the host. • Replication-Target Device: This describes the NAS share or library on a StoreOnce Backup System that has been configured to contain data replicated from a source library. The Replication-Target share is visible to the host, but Replication-Target libraries are not visible to the host, unless you configure devices to make it visible. See Backup applications and Replication Target libraries. A single HP StoreOnce Backup System may host both Replication-Source and Replication-Target shares and libraries and can, therefore, act simultaneously in both Source and Target Appliance roles. However, the host server will only be able to access Replication-Source or Non-Replicating Libraries. You can configure Replication-Target Libraries to make them visible (read-only). There is no restriction on the host accessing Replication-Target NAS shares. Figure 5 Replication elements, using libraries 1. Host backing up 2. Source Appliance 4. Non-Replicating Device (Share or Library) 5. Replication Source Device (Share or Library) 3. Target Appliance 6. Replication Target Device (Share or Library) 20 Replication