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.conf5:
virtio_blk_load="YES"
DESCRIPTION
The 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.conf5.- 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.
HISTORY
The driver was written by An Bryan Venteicher Aq [email protected] . It first appeared in Fx 9.0 .