HP StoreOnce 4430 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

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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
3. Target Appliance
2. Source Appliance
4. Non-Replicating Device (Share or Library)
6. Replication Target Device (Share or Library)
5. Replication Source Device (Share or Library)
20
Replication