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Topic # 22507 30-May-2008 00:43
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I'm trying to download the Microsoft Small Business Server 2008 RC0 ISO and I'm getting 80KB, but the Windows XP Service Pack 3 download was coming down at 550KB (my max sync speed.)

Both files are coming from the XNET Akamai Server (58.28.25.10)

Windows XP Service Pack 3 - 550KB Second DL
http://download.windowsupdate.com/msdownload/update/software/svpk/2008/04/windowsxp-kb936929-sp3-x86-enu_c81472f7eeea2eca421e116cd4c03e2300ebfde4.exe

Microsoft Small Business Server 2008 RC0 - 80KB Second DL
http://download.windowsupdate.com/msdownload/update/software/svpk/2008/04/windowsxp-kb936929-sp3-x86-enu_c81472f7eeea2eca421e116cd4c03e2300ebfde4.exe

Does anyone know why this would be happening?

I'm assuming that the Akamai Server doesn't actually have the second file downloaded yet, and is downloading it from another server, hence the slowness.

But I know nothing about the Akamai servers, anyone care to enlighten me???






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cisconz
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  Reply # 134326 30-May-2008 07:50
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which one was running slow?




Hmmmm



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  Reply # 134346 30-May-2008 08:51
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cisconz: which one was running slow?


I edited my post above, had accidently swapped around the figures, the SBS ISO download is running slow, but this morning it seems to be running at full speed, so I guess the Akamai servers had not cached the file yet.




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  Reply # 135217 3-Jun-2008 16:15
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exportgoldman:
Does anyone know why this would be happening?

I'm assuming that the Akamai Server doesn't actually have the second file downloaded yet, and is downloading it from another server, hence the slowness.

But I know nothing about the Akamai servers, anyone care to enlighten me???


your assumption is correct. Akamai servers basically cache the files youre trying to download, so if youre the first person to request a file the Akamai server has to go download it itself. Anyone else (including you) who re-requests the file will be served the file from the Akamai server's cache (and hence it will be faster).

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  Reply # 135226 3-Jun-2008 16:37
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Akamai precaches popular content at trickle speeds (usually 1-2Mbps 24x7) - obviously not all MSDN type downloads are pushed to every deployment due to file size.  If Ghost doesn't have a copy of the item requested, it will cache it as mentioned above.

Also note that download.microsoft.com does not always use Akamai.  Microsoft shifts their traffic around CDNs depending on price and demand.  You can often see traffic being sourced from 3 or 4 CDNs or from Microsoft themselves.

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