Whilst reviewing a colleague’s Active Directory design document today, I came across the following model for determining the cost of a site link, depending on the available bandwidth:
Replication cost = 1024 x 1/logbandwidth (in Kbps)
The following table gives some example costs for common bandwidth values:
| Bandwidth (Kbps) | Replication cost |
|---|---|
| 28 | 702 |
| 56 | 586 |
| 64 | 567 |
| 96 | 517 |
| 128 | 486 |
| 256 | 425 |
| 512 | 378 |
| 1024 | 340 |
| 2048 | 309 |
| 4096 | 283 |
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