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

       The hv_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>.

Debian                                         September 10, 2013                                     HYPER-V(4)