HP 12000 HP VLS Solutions Guide Design Guidelines for Virtual Library Systems - Page 19

Figure 7 Remote Site Data Protection Using Replication Deduplication is the key technology enabler for replication on HP VLS and D2D systems. (VLS systems use HP Accelerated deduplication, and D2D systems use Dynamic deduplication.) The same technology that allows duplicate data to be detected and stored only once on the HP VLS or D2D system also allows only the unique data to replicate between sites. Because the volume of data being replicated between sites is much less than if the full data set was replicated, you can use lower bandwidth links at correspondingly lower price points. In addition, backup at remote offices can be automated to a local virtual tape library and then replicated back to a regional data center or primary data center allowing end-to-end management from the data center of all data in the remote offices. This transformation is shown in Table 5 (page 19) which compares the amount of data to transfer both with and without deduplication. The amount of data to back up in this example is 1 TB. Table 5 Estimated Time to Replicate Data for a 1 TB Backup Environment at 2:1 Link Type Data Sent T1 Link Rate (66% efficient) 1.5 Mb/s Backup Type Without deduplication Incremental 50 GB 4.5 days Full 500 GB 45.4 days Change Rate With deduplication 0.5% 13.1 GB 29 hours 1.0% 16.3 GB 35 hours 2.0% 22.5 GB 49 hours T3 44.7 Mb/s 3.8 hours 1.6 days 59 minutes 73 minutes 102 minutes OC12 622.1 Mb/s 16 minutes 2.7 hours 4.3 minutes 5.3 minutes 7.3 minutes Replication 19