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significantly higher cost. While some may say 1 GB/sec is not low bandwidth, everything is
relative to the task at hand.
Table 23 Summary of the Calculations Involved in the Sizing Examples
Data types (3
Full size in GB
DB:1 FS) &
backup type
Database (Full)
15000
1% change
File data (Full)
5000
Database (Full)
50000
1% change
File Data
16666
(incremental
10%)*
Database (Full)
200000
1% change
File Data
66666
(incremental
10%)*
* Fulls on the weekend.
4.
Sizing Scenario: Many-to-one (4:1) replication.
Figure 55 VLS Sizing Example 4
Replicated data
Time available
(compressed) in
to
GB
replication/time
to replicate
198
24 hours
297
660
9.5 hours
99
3.3 hours
2640
24 hours
3960
Link speed
Combined link
available or
speed
required in
Mbit/sec
83 at 40%
20 Mbits/sec at
utilization
40% utilization
125 at 40%
utilization
Assume fixed
Assume fixed
dedicated link
dedicated link
speed of 400
speed of 400
Mbit/sec
Mbit/sec
444 at 100%
At greater than 1
Gb/sec+ at high
volumes add
666 at 100%
extra link
bandwidth for
catch-up
Design Considerations
1 19
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