We have a problem with one of our servers in the office. We have 5 identical servers. Same model, same HD, memory etc. Everything is fine for the 4 of the servers. One of them (the red line in the attachment) is always very high (% Disk Time) in the Performance log. Even when all of the users are logged out (all of the users are being used as application servers via terminal services) Application3 is showing activity. We replaced the disks (Mirror) we scanned for viruses, spywares etc but we didn't find anything. Also have in mind that the users logged in each server every day are different. (We use Sun Rays and the sessions are doing load balancing)
The servers are SUN 4150 with Windows Server 2003 Enterprise Edition, 16GB memory and 2 Quad Code Processors.
What could be the cause for this?