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Man Pages


Manual Reference Pages  -  HV_ATA_PCI_DISENGAGE (4)

NAME

hv_ata_pci_disengage - Hyper-V ATA PCI Disengage driver

CONTENTS

Synopsis
Description
See Also
History
Authors

SYNOPSIS

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


.Cd device hyperv

DESCRIPTION

The hv_ata_pci_disengage driver prevents the native
.Fx ATA driver from loading in the presence of Hyper-V.
.Fx guests running on Hyper-V can take advantage of the Hyper-V Storage Virtual Consumer (hv_storvsc(4)) for using their IDE devices. Since the ATA driver serves IDE devices as well, there is a chance that the ATA driver may interfere with the operations of hv_storvsc(4). The hv_ata_pci_disengage driver avoids conflicts between the ATA driver and hv_storvsc(4) by disabling the ATA driver when the
.Fx guest is booting.

A side effect of disabling the ATA driver is that CDROM may become inoperational on
.Fx guest partitions. If CDROM access is a must then users may use "set hw.ata.disk_enable=1" at boot time to prevent the ATA driver from being disabled.

SEE ALSO

hv_vmbus(4), hv_utils(4), hv_netvsc(4), hv_storvsc(4)

HISTORY

Support for hv_ata_pci_disengage first appeared in
.Fx 10.0 . The driver was developed through a joint effort between Citrix Incorporated, Microsoft Corporation, and Network Appliance Incorporated.

AUTHORS


.An -nosplit
.Fx support for hv_ata_pci_disengage was first added by
.An Microsoft BSD Integration Services Team Aq bsdic@microsoft.com .
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