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Manual Pages  — VIRTIO_BLK

NAME

virtio_blk – VirtIO Block driver

CONTENTS

SYNOPSIS

To compile this driver into the kernel, place the following lines in your kernel configuration file: device virtio_blk

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): 

virtio_blk_load="YES"

DESCRIPTION

The virtio_blk device driver provides support for VirtIO block devices.

LOADER TUNABLES

Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5).
hw.vtblk.no_ident
hw.vtblk.X .no_ident
 

These tunables disable retrieving the device identification string from the hypervisor either globally or per-device. The default value is 0.

hw.vtblk.writecache_mode
hw.vtblk.X .writecache_mode
 

These tunables determine the write cache mode globally or per-device. The mode can changed only if the ConfigWCE feature is negotiated. Set to 0 for writethrough mode, 1 for writeback mode, and -1 to leave it as-is. The default value is to leave as-is.

SYSCTL VARIABLES

The following variables are available as sysctl(8) variables.
dev.vtblk.X .writecache_mode
 

The write cache mode of the device can be either writethrough (0) or writeback (1). If the ConfigWCE feature is negotiated, the write cache mode can be toggled between writethrough and writeback.

SEE ALSO

virtio(4)

HISTORY

The virtio_blk driver was written by Bryan Venteicher <Mt bryanv@FreeBSD.org>. It first appeared in FreeBSD 9.0 .
VIRTIO_BLK (4) July 2, 2013
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