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VIRTIO_BLK(4)	       FreeBSD Kernel Interfaces Manual		 VIRTIO_BLK(4)

NAME
     virtio_blk	-- VirtIO Block	driver

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 write-
	     back.

SEE ALSO
     virtio(4)

HISTORY
     The virtio_blk driver was written by Bryan	Venteicher
     <bryanv@FreeBSD.org>.  It first appeared in FreeBSD 9.2.

FreeBSD	9.3			 July 2, 2013			   FreeBSD 9.3

NAME | SYNOPSIS | DESCRIPTION | LOADER TUNABLES | SYSCTL VARIABLES | SEE ALSO | HISTORY

Want to link to this manual page? Use this URL:
<http://www.freebsd.org/cgi/man.cgi?query=virtio_blk&sektion=4&manpath=FreeBSD+9.3-RELEASE>

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