esSJae's Virtualization Blog

Virtualization and other IT topics

VMWare vSphere Hypervisor 5

Posted by essjae on September 2, 2011

I was excited to try out the new free version of ESXi 5 today on a test system with a Core 2 Quad Q6600. 

I received an ominous message that “VMWare ESXi 5.0 installs on most systems but only systems on VMWare’s compatibility Guide are supported.”  I didn’t think much of it until I got to the next stage of the install and got this message:

“Error(s) <CPU_CORES ERROR: This host has [1] cpu core(s) which is less than recommended [2] cpu cores>”

“(F9) Back                (F11) Reboot”

Game over?  Not quite.  I found a post with an almost identical hardware config referring to the same issue for ESX 3. 

Disable MAX CPUid in the BIOS, installation completed.

2 Responses to “VMWare vSphere Hypervisor 5”

  1. Selganor said


  2. Ashok said

    I too was getting following error. On my Xeon 3Gig server.

    “Error(s) ”

    I enabled “MAX CPUid” in BIOS.

    Then followed

    Resolution (Quick and Dirty Fix)
    By going to the Edit options and advanced boot mode type nocheckCPUIDlimit and enter .. which will allow you to proceed with the installation.

    If you receive the error saying the “Processor is not support and ESXi 5.0 needs LAHF and SAHF instruction CPU”

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