HP 12000 Design Manual 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
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
Data Sent
Link Rate (66% efficient)
Backup Type Without deduplication
Incremental 50 GB
Full 500 GB
Change Rate With deduplication
0.5% 13.1 GB
1.0% 16.3 GB
2.0% 22.5 GB
Table 5 (page 19) which compares the amount of data to transfer
Link Type
T1
1.5 Mb/s
4.5 days
45.4 days
29 hours
35 hours
49 hours
T3 OC12
44.7 Mb/s 622.1 Mb/s
3.8 hours 16 minutes
1.6 days 2.7 hours
59 minutes 4.3 minutes
73 minutes 5.3 minutes
102 minutes 7.3 minutes
Replication 19