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During the installation of ESXi 5.5, the following error message is reported:
Hardware Virtualization is not a feature of the CPU, or is not enabled in the BIOS.
Which condition would generate this message?
A. LAHF/SAHF is not enabled in the BIOS.
B. NX/XD is not enabled in the BIOS.
C. SSE3 is not enabled in the BIOS.
D. Hyperthreading is not enabled in the BIOS.
Correct Answer: A
Explanation/Reference:
Explanation:
LAHF and SAHF are used for virtualization and is set by the Virtualization Technology (VT) option in the system BIOS.
Incorrect Answers:
B: The NX/XD setting for the CPU in the system BIOS mark memory pages as data-only to prevent malicious software exploits and buffer overflow attacks. This setting is exposed to all guest operating systems that can use it. It is not required for hardware virtualization.
C: SSE3 (Streaming SIMD Extensions 3) is a SIMD instruction set extension for x86 CPUs. It improves performance particularly on single precision floating point data operations. It is not required for hardware virtualization.
D: Hyperthreading is a technology used to allow a CPU to appear as two logical processors. It is not required for hardware virtualization.
References:
http://vsphere-land.com/news/what-is-sahf-and-lahf-and-why-do-i-need-it-to-install-vsphere-51.html
http://pubs.vmware.com/vsphere-4-esx-vcenter/index.jsp#migrating_virtual_machines/c_nx_xd_considerations.html
http://en.wikipedia.org/wiki/SSE3
Ferguson, Bill, The Official VCP5 Certification Guide, VMware Press, New York, 2013, pp 28-29