Differential D3679 Diff 9292 head/sbin/geom/class/nop/gnop.8

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head/sbin/geom/class/nop/gnop.8

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	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)			.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT			.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY			.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF			.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	.\" SUCH DAMAGE.			.\" SUCH DAMAGE.
	.\"			.\"
	.\" $FreeBSD$			.\" $FreeBSD$
	.\"			.\"
	.Dd September 15, 2015			.Dd October 10, 2015
	.Dt GNOP 8			.Dt GNOP 8
	.Os			.Os
	.Sh NAME			.Sh NAME
	.Nm gnop			.Nm gnop
	.Nd "control utility for NOP GEOM class"			.Nd "control utility for NOP GEOM class"
	.Sh SYNOPSIS			.Sh SYNOPSIS
	.Nm			.Nm
	.Cm create			.Cm create
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	.Nm			.Nm
	.Cm unload			.Cm unload
	.Sh DESCRIPTION			.Sh DESCRIPTION
	The			The
	.Nm			.Nm
	utility is used for setting up transparent providers on existing ones.			utility is used for setting up transparent providers on existing ones.
	Its main purpose is testing other GEOM classes, as it allows forced provider			Its main purpose is testing other GEOM classes, as it allows forced provider
	removal and I/O error simulation with a given probability.			removal and I/O error simulation with a given probability.
	It also gathers the following statistics: number of read requests, number of			It also gathers statistics on the number of read, write, delete,
	write requests, number of bytes read and number of bytes written.			getattr, flush, and other requests, and the number of bytes read and written.
	In addition, it can be used as a good starting point for implementing new GEOM			.Nm
				can also be used as a good starting point for implementing new GEOM
	classes.			classes.
	.Pp			.Pp
	The first argument to			The first argument to
	.Nm			.Nm
	indicates an action to be performed:			indicates an action to be performed:
	.Bl -tag -width ".Cm configure"			.Bl -tag -width ".Cm configure"
	.It Cm create			.It Cm create
	Set up a transparent provider on the given devices.			Set up a transparent provider on the given devices.
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