NAME

     virtio_scsi — VirtIO SCSI driver

SYNOPSIS

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

           device virtio_scsi

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

           virtio_scsi_load="YES"

DESCRIPTION

     The virtio_scsi device driver provides support for VirtIO SCSI devices.

LOADER TUNABLES

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

     hw.vtscsi.bus_reset_disable
             In the initial QEMU release with VirtIO SCSI support, in-flight operations were not
             aborted when stopping the device, rendering bus reset ineffective.  This tunable
             disables attempts to issue reset bus commands.  The default value is 1.

DEBUGGING

     To enable debugging prints from the virtio_scsi driver, set the

           hw.vtscsi.X.debug_level

     variable, where X is the adapter number, either in loader.conf(5) or via sysctl(8).  The
     following bits have the described effects:

           0x01    Enable informational prints.

           0x02    Enable prints for driver errors.

           0x04    Enable tracing prints.

SEE ALSO

     virtio(4)

HISTORY

     The virtio_scsi driver was written by Bryan Venteicher <bryanv@FreeBSD.org>.  It first
     appeared in FreeBSD 10.0.