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EdZ314
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Enthusiast

Thanks for the information about the TLB and the BIOS recommendations. There are two VMWare KB's which I have been referred to which are fixed in a recent ESX 5.5 patch

VMware KB: VMware ESXi 5.x host fails with a purple diagnostic screen with an unexpected function fl...

VMware KB: VMware ESXi 5.x host fails with a purple diagnostic screen with an unexpected function fl...

These are included in the post 5.5 U2 patch below:

VMware KB: VMware ESXi 5.5, Patch ESXi-5.5.0-20141004001-standard

We're going to try both and see what happens. Also, please note that although the TLB ACK invalidate has been consistently referred to as a hardware related problem (CPU not responding) in my support cases, there are some VMWare documents that clearly state that the CPU can go into a non-responsive state for an extended period due to an ESXi software issue as well.

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