virtualbox.org

Hello all,

I have the following setup:
On win 8.1(i5-2430M CPU 2.4Ghz, 8GB ram), I have installed VirtualBox(last one), which has one virtual machine with Vmware ESXI 6.0.
Using Vmware converter I'm trying to convert a physical server(Debian 8, 64bit) as the destination to my Esxi VM, but all I get is the error: the destination does not support 64-bit guests.
I have activated in BIOS Virtualization Technology and Execute Disable and in VirtualBox checked VT-x, AMD-v, nested paging, pae/nx.

Any ideas on how to resolve this issue?

Most unlikely. 64-bit guests require hardware virtualization and you are running VirtualBox on a virtual machine, not a physical one. This is called nested virtualization and is not supported.

Is this your layout? Windows 8.1 -> Virtualbox -> Vmware ESXI 6.0

Virtualbox can use VT-x to run 64-bit guests, but it cannot pass VT-x into the Virtualbox guest so another virtualizer (ESXI in this case) to use to run another layer of 64-bit.

I believe that VMware and Virtualbox can be installed on the same host OS, just don't run them both at the same time.

If you're worried about issues after trying to install VMware on your Windows 8.1 along with Virtualobx, do a manual Windows System Restore Point before installing VMware, and I would take a reliable disk image of the entire Widnows OS.

Converting a physical server to virtual is called P2V, google "P2V site:forums.virtualbox.org" for how to do it as a destination to Virtualbox. you can google "P2V Linux to VMware" too. Running VMware in a Virtualbox guest is not likely going to work.