I have been working on a BIOS policy for our recently purchased UCS B250-M2 units so I can take advantage of the Cisco Fabric and VMware ESXi 4.1 U1. Today I finally completed the policy which we will use moving forward. I will post the PDF of the settings I used very soon.
I came across an excellent Cisco Document with all of the settings and descriptions. You might find this help in the future.
NOTE: Cisco has advised that C6 and C3 combinations may cause problems. I found this also on an IBM site with a better description of the problem:
On a subset of Intel Xeon 5600 series processors, during package C6 (ACPI C3) transitions, an internal circuit marginality may cause JEDEC DDR3 specification violations. These violations may result in control and data signal errors upon exiting from package C6 state. This could create an invalid DRAM state, system hang, reboot, and memory ECC errors. For systems with ECC memory, correctable/uncorrectable ECC errors may be logged in the IA32_MC8_Status MSR with memory errors resulting in a machine check exception.
NOTE: The ACPI C3 setting in SETUP equates to the Intel processor C6 state.
This issue affects only the Intel Xeon 5600 series processors in systems that are running with ACPI C3-state enabled, and the memory errors reported in run-time. Memory failures reported in POST are not affected, and should be treated as the normal memory fallout.
Basically turn off C3 and C6 on Cisco B250-M2 units, it is not just Cisco with this problem.
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