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VIRTIO_BLK(4)		    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
	       writeback.

SEE ALSO
       virtio(4)

HISTORY
       The    virtio_blk    driver    was    written   by   Bryan   Venteicher
       <bryanv@FreeBSD.org>.  It first appeared	in FreeBSD 9.0.

FreeBSD	14.3			 July 2, 2013			 VIRTIO_BLK(4)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=virtio_blk&sektion=4&manpath=FreeBSD+14.3-RELEASE+and+Ports>

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