NAME
hv_storvsc
—
Hyper-V Storage Virtual Service
Consumer
SYNOPSIS
To compile this driver into the kernel, place the following lines in the system kernel configuration file:
device hyperv
DESCRIPTION
Thehv_storvsc
driver implements the virtual store
device for FreeBSD guest partitions running on
Hyper-V. FreeBSD guest partitions running on Hyper-V
do not have direct access to storage devices attached to the Hyper-V server.
Although a FreeBSD guest can access storage devices
using Hyper-V's full emulation mode, the performance in this mode tends to be
unsatisfactory.
To counter the above issues, the
hv_storvsc
driver implements a storage Virtual
Service Consumer (VSC) that relays storage requests from the guest partition
to the storage Virtual Service Provider (VSP) hosted in the root partition
using the high performance data exchange infrastructure provided by
hv_vmbus(4) driver. The VSP in the root partition then forwards the
storage related requests to the physical storage device.
This driver functions by presenting a SCSI HBA interface to the Comman Access Method (CAM) layer. CAM control blocks (CCBs) are converted into VSCSI protocol messages which are delivered to the root partition VSP over the Hyper-V VMBus.
SEE ALSO
hv_ata_pci_disengage(4), hv_netvsc(4), hv_utils(4), hv_vmbus(4)
HISTORY
Support for hv_storvsc
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_storvsc
was first added by
Microsoft BSD Integration Services Team
<bsdic@microsoft.com>.