Hi John,

1. I've read that virtualbox and bhyve cannot run at the same time. Is
this still the case? (because I've managed to start a bhyve instance
with virtualbox still running - is this a fluke?)

If you use VirtualBox with VT-x disabled, i.e. binary translation mode, it will work.

Otherwise, all bets are off. There is no way to share VT-x resources (vCPU TLB tags, CPU VMCS state etc) so eventually the hypervisors will collide.

2. Can I take a system made in virtualbox and boot with it using bhyve?
The system 'hard drives' are all VDI (the default in virtualbox)

You would have to convert the VDI file to a flat file with a tool like qemu-img. Depending on the o/s, the disk and network adapter type may have to be the same in vbox and bhyve or init scripts may not be able to locate interface/disk names.

 Also, the vbox guest should be configured with a serial console.

3. if I can't boot it without conversion to something else, how do I go
about it?

4. what's the maximum number of cpu and the maximum ram and HD space
that I can give to a bhyve VM?

 bhyve's vCPU limit is 16. There are no limits on HD space.

5. if I make a VM and put opensuse (latest) on it, is it preferable to
have the HD as raw or as ext-3 (or whatever the default for opensuse
is)? If the latter, is there a penalty in terms of performance or
security? The host runs zfs.

Do you mean, the virtual disk type for the guest, something like vmdk/vdi/vhd/raw ?

later,

Peter.

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