What open sources tools do you recommend for stress-testing a Linux server?
Specifically, we're wanting to thrash the CPU, hard disk array and memory.
We have a 4-year-old IBM server that was freezing with it's Windows Server 2003 installation. We're wanting to verify that the issue is not hardware related by testing the major components under high load, with the view of re-purposing the hardware as a LAMP box.
One recommendation per response please.