HYPER-V(4)

NAME
hv_storvsc - Hyper-V Storage Virtual Service Consumer

SYNOPSIS
The hv_storvsc driver implements the virtual store device for FreeBSD guest partitions running on Hyper-V.

DESCRIPTION
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 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 Hyper-V in the form of ports was first released in September 2013. The driver was developed through a joint effort between Citrix Inc., Microsoft Corp. and Network Appliance Inc..

AUTHORS
-nosplit FreeBSD support for hv_storvsc was first added by Microsoft BSD Integration Services Team <bsdic@microsoft.com>.