We have a Dell Poweredge T420 that we installed in August and it only runs a SQL web app. About a month ago the app started running terribly slow, so as a last ditch effort to fix the issue I updated the RAID drivers and firmware and also the BIOS. After that the server ran like it used to. Now a month later the system is doing the EXACT SAME THING! There aren't any errors in event ID, and Open Manage indicates nothing is wrong. There aren't any newer versions of the driver, firmware, or BIOS. I am at a loss.
Dell Power Edge T420
Windows server 2008 R2 SP1
SQL 2008 R2
Only half memory is being used and the processor is barely being touched.
The only other symptom is that I noticed is that extracting/zipping a file takes quite a long time and that there is a small lag in using the OS.
Has anyone ever seen anything like this?