HV_STORVSC(4FREEBSD) - man page online | special files

HYPER-V(4)                         BSD Kernel Interfaces Manual                        HYPER-V(4)

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 con‐
     figuration file:

           device hyperv

DESCRIPTION
     The hv_storvsc driver implements the virtual store device for FreeBSD guest partitions run‐
     ning 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 unsat‐
     isfactory.

     To counter the above issues, the hv_storvsc driver implements a storage Virtual Service Con‐
     sumer (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_vmbus(4), hv_utils(4), hv_netvsc(4), hv_ata_pci_disengage(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
     <@microsoft.com>.

BSD                                     September 10, 2013                                    BSD