HP 12000 HP VLS Solutions Guide Design Guidelines for Virtual Library Systems - Page 119

Table 23 Summary of the Calculations Involved in the Sizing Examples, VLS Sizing Example 4

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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 DB:1 FS) & backup type Full size in GB Database (Full) 15000 1% change File data (Full) 5000 Database (Full) 50000 1% change File Data (incremental 10%)* 16666 Database (Full) 200000 1% change File Data (incremental 10%)* 66666 * Fulls on the weekend. Replicated data (compressed) in GB 198 297 660 99 Time available to replication/time to replicate Link speed available or required in Mbit/sec 24 hours 83 at 40% utilization 125 at 40% utilization 9.5 hours 3.3 hours Assume fixed dedicated link speed of 400 Mbit/sec 2640 3960 24 hours 444 at 100% 666 at 100% Combined link speed 20 Mbits/sec at 40% utilization Assume fixed dedicated link speed of 400 Mbit/sec At greater than 1 Gb/sec+ at high volumes add extra link bandwidth for catch-up 4. Sizing Scenario: Many-to-one (4:1) replication. Figure 55 VLS Sizing Example 4 Design Considerations 119

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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
Combined link
speed
Link speed
available or
Time available
to
Replicated data
(compressed) in
GB
Full size in GB
Data types (3
DB:1 FS) &
backup type
required in
Mbit/sec
replication/time
to replicate
20 Mbits/sec at
40% utilization
83 at 40%
utilization
24 hours
198
15000
Database (Full)
1% change
125 at 40%
utilization
297
5000
File data (Full)
Assume fixed
dedicated link
Assume fixed
dedicated link
9.5 hours
660
50000
Database (Full)
1% change
speed of 400
Mbit/sec
speed of 400
Mbit/sec
3.3 hours
99
16666
File Data
(incremental
10%)*
At greater than 1
Gb/sec+ at high
444 at 100%
24 hours
2640
200000
Database (Full)
1% change
volumes add
666 at 100%
3960
66666
File Data
(incremental
10%)*
extra link
bandwidth for
catch-up
* Fulls on the weekend.
4.
Sizing Scenario: Many-to-one (4:1) replication.
Figure 55 VLS Sizing Example 4
Design Considerations
119