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Total_Wimp

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Exchange 2010 distribution group performace

We have two sites with 70 users roughly evenly split between the two.  We have a relatively slow/overutilized pipe between the sites.  Occasionally an executive wants to send an email containing one or more attachments to a distribution group consisting of all users in all sites.

We understand that SIS no longer exists in 2010.  Storage is not a big issue for us.  However, since bandwidth is an issue, we want to make sure we're not sending a lot of data over the pipe when these messages go out.

So the question is, how will these messages get expanded?  Will Exchange on site A expand all messages and then send 35 copies, with an attachment each, to the other site?  Will Exchange send a single copy to each database and then the database will expand the message into all necessary copies?  Will it be another method?

Once again, our goal is bandwidth sparing.  We need to know how the expansion will affect how much data goes over the pipe so we'll know how severely we need to limit attachment size.

PS, links to official data would be awesome and make my boss extra happy.

Thanks!
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Jon Brelie
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exchange is smart enough to send a single copy of the attachment over the link and it will get distributed in the databases/mailboxes on the other end
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Total_Wimp

ASKER

We do have a hub transport on both ends.  But I'm hoping someone can come up with an authoritative source for this.  I've tried quite a few searches and so far come up with a lot of irrelevant info, mostly a lot of talk about SIS and general i/o performance improvements to 2010.
having hub on both sides is the only option and exchange does send only one copy over the WAN
If you're looking for an authoritative source, I suggest you click on Akhater's username and take a peek at his profile.

That's about as authoritative as you're going to find using the google.
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No disrespect was meant for Akhater, but whenever I read a post from "some dude" that's just a single line with no attribution,  I always take it with a grain of salt until I can get confirmation.  That said, clicking on Akhater's username was indeed impressive :-)

And confirmation has been received.  Delay fan-out and bifurcation were indeed the search terms I needed.