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  1. #1
    Join Date
    Nov 2002
    Posts
    47

    Bandwidth calculation

    How do you get 1mbps to be approxmiately 320GB?

  2. #2
    Join Date
    Jun 2001
    Location
    Chicago, IL
    Posts
    1,953
    assuming full use of the line(not likely)

    1000kbits=125kbytes
    125*60*60*24*30=324000000 kbytes/1000000=324gigabytes
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  3. #3
    Join Date
    Nov 2002
    Posts
    47
    Oh ok I see, thanks

  4. #4
    Join Date
    Nov 2002
    Posts
    47
    SO how do they calculate bandwidth overage, taking for example, I do not exceed 320GB, but at certain times it goes to about let's say 5-10mbps

  5. #5
    Join Date
    Sep 2002
    Location
    Phoenix area
    Posts
    1,121
    Different places measure xfer differently.

    Some will take a quick measurement at certain intervals, take the 95th percentile of that, average them, and multiply to get one month. Theoretically its pretty close to actual xfer.
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  6. #6
    Depending on the measurements being used which I am assuming 1MB/s is part of a 95th percentile measurement this is hardly equal to 320GB of Actual transfer. While results are always different when trying to determine how many GB's a 1MB/s it is no where near 320GB of transfer and much closer to 150GB with maximum being 200GB of transfer.

    For example in reviewing a customer who was pushing 1.3MB/s on a 95th percentile basis the Actual GB's were right around 220GB's of transfer.

    How 95th percentile actually works is every couple of minutes your server is polled, these polls are stored throughout the month. At the end of the month they are arranged from highest to lowest. The upper 5% is knocked off and the very next reading is what you are being charged for.

    Some providers take that number and use a formula to let you calculate what your "Actual" GB's would be if you sustained the 95th percentile reading, this does not actually give you a true and accurate "Total" GB's, but rather a scenario what if based "Total GB's".

    Other providers will actually parse your log files add up the total bytes transferred and give you the grand total. My opinion this method is what you the customer should be looking for. Utilizing the above method and giving you a lame 95th "what if" reading ends up costing you 100-150GB of transfer you never really used.
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  7. #7

  8. #8
    Join Date
    Aug 2000
    Location
    Phoenix, Arizona
    Posts
    558

    bandwidth calcs

    a quick way is (average mbs/64) * 20 = total GB/month

  9. #9
    Join Date
    Aug 2002
    Location
    Kelowna B.C.
    Posts
    1,687
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  10. #10
    theres a better better one

    http://www.nyi.net/BandwidthCalc.php

  11. #11
    Join Date
    Aug 2002
    Location
    Kelowna B.C.
    Posts
    1,687
    ahhhhh......(pause)........

    No.
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