Hello Dgingeri I would recommend that you upgrade the BIOS and iDRAC/BMC to the latest revision. If that does not resolve the issue then try disabling C states and CE1 in the BIOS. Those options should be under the processor/cpu section of the BIOS settings. Thanks
I posted this in the VMWare forums, but I haven't been able to get anyone to respond.  Perhaps someone knows something here? I just got a Dell T110 II server for personal training and experimenting.  I signed up for a free license for ESXi 5 to use for this purpose, then did extensive research over several weeks to find the hardware that would support it in a price range I could afford.  So, this machine is pretty bare bones.  It's got a Xeon E3-1230 (4 core with HT), 4GB of ECC memory, a PERC H200 controller, a 500GB 7200rpm SAS hard drive, and a DVD drive.  I also bought a 8GB HP USB flash drive (transfer rate of about 25MB/s) to put the hypervisor on so I could reserve the entire hard drive for VMs.  ESXi 5 installs and starts perfectly.  I'm able to configure it and manage it from my main system.  However, after about an hour, the system just hangs.  It doesn't matter if I'm doing something with it or doing nothing.  I could have no VMs, or up to 4, and it still does it.  (4 was as high as I got, and it hung right as I was building the 4th with CentOS 6.2)  To troubleshoot, I tried using the 500GB drive (taking out the USB flash drive) as the install point, and put in a 1TB drive I had around (both drives are Seagate) to hold the VMs.  Same problem.  I tried using the USB flash drive and an external USB drive to store the VMs.  Same thing.  I tried using totally different (a couple 750GB WD Caviar Black drives I have from my main computer) hard drives.  Same thing.  I haven't been able to try swapping anything else, as I don't have that much server grade hardware.  So, I tried other things. I installed Windows 2008 R2 and let it idle.  No hangups, ran fine for 48 hours.  I installed CentOS 6.2.  Ran fine for 48 hours.  I even have it running the Windows Server 8 beta right now, and it has run fine since Saturday night.  So, this is definitely a VMWare problem.  The hardware is all on the compatability list, but it won't work right. I don't know what to try next.  Are there drivers I need to upgrade?  Is there a patch I don't know about?  Any suggestions? 
T110 II hanging in ESXi 5