I configured my windows 2003 Storage Server with NIC teaming at the device level and configured the cisco 3750 switch for LACP. It's set up identicl to this ( It was working great for couple of days. After that I noticed that when some files are copied to the storage server, it'll go really fast for about 30 seconds, and then it really slows down to a crawl. If the file is small it's no problem, but the bigger files will for certain fail. I am confused becaused it worked for couple of days. Any ideas anyone? I've considered the possibility of increasing the Jumbo Frame setting on the switch to 9000, but I read somewhere that that can cause other issues, or I may have to enable it on all the servers and all the switches upstream and downstream.