Need Quick Estimate: Migration Bandwidth Requirements

Posted on 2006-03-31
Last Modified: 2011-10-03

We might be migrating a Lotus Domino Server to Exchange 2003 and it might have to go over a WAN connection. I don't know my WAN connection speeds for T1, T3, Cable, DSL, whatever so I don't know how to judge minimum requirements for the WAN connection. Besides LAN specs, what would be an optimal WAN connection speed requirement for migrating email data from Notes to Exchange 2003?

Additionally, I know I can migrate about 1GB or data in about 20 to 30 minutes via a LAN. In your recommendation above please help me predict how fast 1GB would migrate over your recommended minimum LAN requirement.

Question by:jhieb
    LVL 15

    Accepted Solution

    1GB in a lan environment should take more than 30-40 minutes if you have 100MB switches and running network. 1GB over the wan will probably take around 3-4 hours or so if you have a t1 with about 150 KB download speed.
    LVL 15

    Expert Comment

    The migration network bandwidth requirements are the same as those for IMAP4 clients, although, for high speed migrations, more bandwidth is required. I recommends 100 megabits per second (Mbps).
    LVL 1

    Author Comment

    Thank you!
    LVL 3

    Expert Comment

    Well speeds vary by carrier for connections like DSL/Cable so you'd have to check with your local provider to be sure what's available.
    On the whole, DSL and Cable are asynchronis, meaning they download faster then they upload.
    DSL  768kbs - 3mbs Download
           128kbs - 1.5mbs upload  ~90 minutes per Gigabyte

    Cable 1mbs - 6mbs Download
             128kbs - 768kbs Upload  ~190 minutes per Gigabyte

    Some carriers offer synchronis (business DSL) with 1.5mbs up and down (same as T1 in speed).

    T1 = 1.5mbs up and down (dedicated circuit)  ~90 minutes per Gigabyte
    T3 = 44mbs up and down (dedicated circuit)  ~5 minutes per Gigabyte

    Your best bet would be to use a T1 as this is a dedicated circuit.

    check out wikipedia for more info

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