HP StorageWorks 6000 HP StorageWorks VLS and D2D Solutions Guide (AG306-96028, - Page 77

Figure 30 Slot Mappings . • A "slot mapping collection" is any number of slots within a source library that are configured to replicate to a target library. • There is a maximum of one slot mapping collection per source library (you can add slots to mapping after initial creation). • There is a maximum of four slot mapping collections per target library (one for the D2D2500). The preceding example shows the flexibility of HP D2D replication technology. In remote office A, daily "fulls" are taken each day so all six tapes in VTL A1 are required to replicate to an identical target device at data center D because this is considered critical data. All six slots must be mapped, but it is only when data changes on a cartridge in VTL A1 that replication will take place because replication is only "triggered" on cartridge eject. A similar situation applies to VTL B2 in remote office B. However, for host A2 only the weekly full and monthly full require replicating. Rather than create a target replication library at remote site D for just two cartridges, you can combine this with the five cartridges from source library B1. This is because there is a limit of four slot mappings on the target device. So A2 and B1 have to share a slot mapping on VTL D2. Notice how at data center D, target replication libraries can be shared among sources, allowing for consolidation. HP StorageWorks VLS and D2D Solutions Guide 77