Comment posted by Volker Weber07/22/2008 06:25:23 AM
Homepage: http://vowe.net/about
How fast is T1? I read 1.5 Mbps. How much is upstream and downstream?
Comment posted by Joerg Michael07/22/2008 06:36:30 AM
Homepage: http://www.jmichael.eu
up=green, down=blue? I believe you may have killed Fluffy 
Comment posted by Richard Schwartz07/22/2008 06:44:52 AM
Homepage: http://www.poweroftheschwartz.com
That's an awful lot of utilization for a small number of phones! Looks like the green is transmit and the blue is receive, so the bulk of it is the phones downloading data.
@Vowe: according to the chart, the bandwidth is 3Mbps in each direction -- so not an actual "T1" in the traditional sense. The total bandwidth is right for what we call a DS2 here in the US.
Comment posted by Ben Rose07/22/2008 06:50:23 AM
Homepage: http://www.jaffacake.net
@Joerg - LMAO, nice one.
Comment posted by Chris Miller07/22/2008 07:03:10 AM
Homepage: http://www.IdoNotes.com
Are you saying this is traffic between one server and another, not the clients and the web server itself? Does the client attempt to pull from the home server like a Blackberry would?
Comment posted by Volker Weber07/22/2008 07:12:18 AM
Homepage: http://vowe.net/about
Indeed. Sorry, Fluffy.
Bruce, do you suggest, that 20 iPhones saturate a 3 Mbit line? I am not seeing this kind of traffic here. Or is that line between the frontend and backend servers?
Comment posted by Bruce07/22/2008 07:12:53 AM
@Chris,
Our OWA server is located thousands of miles away. The OWA server talks to the Exchange server.
Comment posted by Bruce07/22/2008 07:20:09 AM
@Vowe,
The line is between our remote office and the mother ship OWA server. As soon as we started the iPhone pilot the traffic went through the roof. We have lots of Windows Mobile devices using ActiveSync and do not see this same type of traffic.
But as you can see as soon as we turned off the iPhone/Exchange mail on the iPhones the traffic quieted down. Time to head to work for a brainstorming session.
Comment posted by Paul Robichaux07/22/2008 08:27:19 AM
Homepage: http://www.robichaux.net/blog
Wow, that's really, really odd. As far as Exchange is concerned, the iPhone is indistinguishable from other Exchange ActiveSync clients, so I'm at a loss to understand why you're seeing such a spike in usage. Exchange 2007 has some nifty built-in reporting features to show where your mobile bandwidth is going, but that's not much help to you now. Feel free to ping me privately if you need help troubleshooting this.
Comment posted by Simon Barratt07/23/2008 07:52:14 AM
Homepage: http://apps.fmc.com/blog.nsf
Thanks for the heads up Bruce. I will keep a close eye on our environment. I know we have a couple of iPhones connecting. Our Frontend and Backend servers are on the same LAN though, so we are slightly different in that regard.
Comment posted by Dan Holzrichter08/01/2008 11:36:30 AM
I found a major bug as well. I have about 10 Iphone users on exchange 2007. One of our exchange server started hitting 100% on all processors 2 days ago. It turns out that it is all caused by 1 iphone user. If I kill activesync for the user it drops the cpu back down to 5 or 6%.... ow.
If you turn off the iphone it appears the client access server continues to hammer the session causing the cpu to spike and killing performance for the whole server.
I love my new iphone , but i think they have some work to do getting them ready for the enterprise.
