HP 12000 HP VLS Solutions Guide Design Guidelines for Virtual Library Systems - Page 21
Replication Configuration Options, Active-Passive, Many-to-one, Active-Active and N-Way
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Figure 8 Replication Configuration Options • Active-Passive: The best deployment for a single site disaster recovery protection. The active source device receives the local backup data and then replicates it to a passive target device at the disaster recovery site dedicated to receiving replication data. • Many-to-one: The best deployment for several smaller sites consolidating their replication to a central disaster recovery site. Each source device in the smaller sites replicate to a central target device which you configure to have multiple sources replicate to a common virtual library on the central device (each source replicates to its own subset of the cartridges in the virtual library). Alternatively, each source can have its own dedicated virtual library. Up to four remote VLS sites can copy to a single HP VLS at the central site at launch, and this will be increased over time. Up to 16 remote D2D sites can copy to a single D2D4000 at the central site, and up to 24 remote D2D sites can copy to a D2D4100. • Active-Active and N-Way: The best deployment for sharing your VLS or D2D system hardware for both receiving backups and receiving replication data (so each device is both a source and a target as shown in the above diagram). Active-active is one way to implement cross-replication between sites, but you can use two active-passive deployments to achieve the same result. Choosing between either active-active or 2x active-passive deployments for cross-replication depends on which provides the lowest cost. Active-active is only recommended if the backup traffic on each device is only using up to half of the device's maximum performance and capacity, because you need additional performance and capacity for the replication target operations. For example, if you have two VLS9000 sites that each requires 2-nodes/2-arrays for just their backup performance/capacity and 2-nodes/2-arrays for their replication target performance/capacity, then you have the following choices for cross-replication deployment: ◦ Active-Active: Each site requires a 4-node/4-array VLS9000 (with deduplication) shared between backups and replication target, one rack, and four replication LTUs. ◦ 2x Active-Passive: Each site requires a 2-node/2-array VLS9000 (with deduplication) for backup and a separate 2-node/2-array VLS9000 (with deduplication) for replication target, two racks, and two replication LTUs. Replication 21