Replication Deployment Options; Estimated Time To Replicate Data For A 1 Tb Backup Environment At 2:1 - HP StorageWorks 12000 - Virtual Library System EVA Gateway Manual

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
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 Rate (66% efficient)
Backup Type
Incremental
Full
Change Rate
0.5%
1.0%
2.0%
NOTE:
T1/T3 and OC12 are old terms with respect to WAN link terminology. Many link providers use their
own names (e.g., IP Clear, Etherflow). This document distinguishes them by their speed using 2
Mbits/sec, 50 Mbits/sec, etc.
One consideration with replication is that you must "initialize" the Virtual Tape Libraries with data
prior to starting the replication. This ensures that the source and target devices are both synchronized
with the relevant reference data to allow them to interpret the changed data (deltas) that comes across
the WAN link during replication.

Replication Deployment Options

You can deploy the HP VLS and D2D systems for replication in many ways depending on your
requirements. You should understand the terminology associated with deduplication and replication.
The key terminology for replication deployment:
• Source: A series of slots/cartridges in a virtual library that act as the source data to replicate. This
is the original copy of the backup data, written to and managed by the source site's backup ap-
plication.
• Target or LAN/WAN destination: A series of corresponding slots in another virtual library on
another site in another location which receives data from the source library. This is the secondary
(disaster recovery) copy of the backup data, managed by the replication system.
26 Concepts
Table 5 which compares the amount of data to transfer both with and
Link Type
Data Sent T1
1.5 Mb/s
Without deduplication
50 GB 4.5 days
500 GB 45.4 days
With deduplication
13.1 GB 29 hours
16.3 GB 35 hours
22.5 GB 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