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

     hv_storvsc	-- Hyper-V Storage Virtual Service Consumer

     To	compile	this driver into the kernel, place the following lines in the
     system kernel configuration file:

	   device hyperv

     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 infrastruc-
     ture 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.

     hv_ata_pci_disengage(4), hv_netvsc(4), hv_utils(4), hv_vmbus(4)

     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.

     FreeBSD support for hv_storvsc was	first added by Microsoft BSD
     Integration Services Team <>.

FreeBSD	11.0		      September	10, 2013		  FreeBSD 11.0


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