Illegal OpCode while booting a HPE Proliant server

I was installing a new ESXi and after some steps I got an error “Illegal OpCode” while booting. It happened after ESXi patching with VUM. After some debugging I found the issue.

The server had local storage where I created a VMFS datastore before patching. In BIOS boot order was CD/DVD ROM, Hard Disk and USB. ESXi was installed onto USB. The error happened when server tried to boot from disk which contained VMFS datastore. After I moved USB before Hard Disk in boot order server booted correctly.


ScaleIO software no longer available for download

I saw an article in The Register that Dell EMC will discontinue the software-only version of ScaleIO and you can only get it if you buy it together with hardware (VxRack Flex). Today I tried searching Dell EMC website for ScaleIO downloads but all the links redirected to Dell EMC’s Converged Infrastructure homepage. Seems Dell EMC has removed the possibility download ScaleIO from their website.

ScaleIO is a software-defined storage product. It converts direct-attached storage into shared block storage over LAN.

More info: wikipedia

Windows Defender Credential Guard on VMWare

I got a question about using Windows Defender Credential Guard in VMware virtual machines. I did some digging and found following things:

Info from

Windows Defender Credential Guard requires:

  • Support for Virtualization-based security (required)
  • Secure boot (required)
  • TPM 2.0 either discrete or firmware (preferred – provides binding to hardware)
  • UEFI lock (preferred – prevents attacker from disabling with a simple registry key change)

The Virtualization-based security requires:

  • 64-bit CPU
  • CPU virtualization extensions plus extended page tables
  • Windows hypervisor

As of today only VMware Workstation 14 has option to enable Virtualization-based security. I created a case to VMWare where I inquired about support for Virtualization-based security in vSphere and answer I got that it will be available in the future version.

Update: VMWare has now released vSphere 6.7 which supports Virtualization-based security options.