Well, I'll go ahead and update this in case someone else comes along.  I was able to work around this issue in a fairly ridiculous way.  Here is the complete outline of my situation:   Just purchased ArcServeD2D and a QNAP NAS to move from our old tape based backup to new disk based. The blade servers (PowerEdge 1855) seem to have issues communicating via SMB/CIFS with newer servers and the QNAP NAS.  The blade servers don't have a problem communication via Windows Networking (SMB/CIFS) between themselves. I took one blade server and converted it to Linux (Centos 6.2) to test to see if it was on OS issue; it wasn't. Oddly enough NFS has no problems going between this blade and the NAS. SO, I enabled NFS on the QNAP NAS server and mounted that share on the Linux blade. Then I shared that mounted directory via Samba and setup the other blades to backup via SMB/CIFS to the Linux Samba server.  Therefore, I am actually backing up to the Linux blade via SMB/CIFS to an NFS mounted directory that is then on the QNAP NAS ... :emotion-18: I really hope new Dell servers/equipment doesn't have this kind of trouble because we are going to be upgrading soon.
We purchased these PC2848 switches a while ago to replace some older PC2724 switches.  We have some newer Dell servers now (Power Edge R610 and T710s) that work just fine on these new PC2848 switches but our older servers (Power Edge 1850, & 1855 [blades]) just do not seem to work when plugged into the new 2848 switches.  I've tried matching all settings between them and disabling STP, Jumbo Frames, Flow Control, etc just to get it to match the 2724 switches but it will just not work. I messed around a bit more with our 1850 and updated to Intel's latest drivers (has a Pro 1000 MT dual NIC) and any other drive I could find from Dell and it will at least get some network such as Internet and some network file browsing, but when I try to transfer files from our Windows shares it starts but then usually fails with the "remote file is no longer available" message.  I can't seem to find the issue. Is there some inherent incompatibility with these older servers and the newer 2848 switches?  I'd like to migrate over since we purchased the 48 ports so we would easily be able to fit all connections from these older switches, but now I have to just keep an old switch laying on top of the racks until I can find a way to get away from it.  Any help would be greatly appreciated.  Thanks, in advance.
Switch and server incompatibility when upgrading from PC 2724 to PC 2848