09-24-2014
Hi,
This will explain things, I think.
But it does give rise to a couple of other questions, the first being how many physical drives are there in the system. If the answer is less than five, you will see degradation in the read and write perfomance as it is likely that behind the hypervisor (in your case VirtualBox) there will be less paths than defined devices.
The second question is are you in fact running VirtualBox on a Physical or within a Virtual Server.
Regards
Dave
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LEARN ABOUT FREEBSD
hv_vmbus
HYPER-V(4) BSD Kernel Interfaces Manual HYPER-V(4)
NAME
hv_vmbus -- Hyper-V Virtual Machine Bus (VMBus) Driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in the system kernel configuration file:
device hyperv
DESCRIPTION
The hv_vmbus provides a high performance communication interface between guest and root partitions in Hyper-V. Hyper-V is a hypervisor-based
virtualization technology from Microsoft. Hyper-V supports isolation in terms of a partition. A partition is a logical unit of isolation,
supported by the hypervisor, in which operating systems execute.
The Microsoft hypervisor must have at least one parent, or root, partition, running Windows Server operating system. The virtualization
stack runs in the parent partition and has direct access to the hardware devices. The root partition then creates the child partitions which
host the guest operating systems.
Child partitions do not have direct access to other hardware resources and are presented a virtual view of the resources, as virtual devices
(VDevs). Requests to the virtual devices are redirected either via the VMBus or the hypervisor to the devices in the parent partition, which
handles the requests.
The VMBus is a logical inter-partition communication channel. The parent partition hosts Virtualization Service Providers (VSPs) which com-
municate over the VMBus to handle device access requests from child partitions. Child partitions host Virtualization Service Consumers
(VSCs) which redirect device requests to VSPs in the parent partition via the VMBus. The Hyper-V VMBus driver defines and implements the
interface that facilitate high performance bi-directional communication between the VSCs and VSPs. All VSCs utilize the VMBus driver.
SEE ALSO
hv_ata_pci_disengage(4), hv_netvsc(4), hv_storvsc(4), hv_utils(4)
HISTORY
Support for hv_vmbus first appeared in FreeBSD 10.0. The driver was developed through a joint effort between Citrix Incorporated, Microsoft
Corporation, and Network Appliance Incorporated.
AUTHORS
FreeBSD support for hv_vmbus was first added by Microsoft BSD Integration Services Team <bsdic@microsoft.com>.
BSD
September 10, 2013 BSD