148 lines
4.2 KiB
Groff
148 lines
4.2 KiB
Groff
.\" Copyright (c) 2002
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.\" Nate Lawson. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the author nor the names of any co-contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY Nate Lawson AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 15, 2002
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.Dt SCSI_TARGET 8
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.Os
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.Sh NAME
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.Nm scsi_target
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.Nd usermode SCSI disk emulator
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.Sh SYNOPSIS
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.Nm
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.Op Fl AdST
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.Op Fl b Ar size
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.Op Fl c Ar size
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.Op Fl s Ar size
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.Op Fl W Ar num
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.Ar bus : Ns Ar target : Ns Ar lun
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.Ar filename
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.Sh DESCRIPTION
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The
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.Nm
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utility emulates a SCSI target device using the
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.Xr targ 4
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device driver.
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It supports the basic commands of a direct access device, like
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.Xr da 4 .
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In typical operation, it opens a control device and
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enables target mode for the specified LUN.
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It then communicates with
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the SIM using CCBs exchanged via
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.Xr read 2
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and
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.Xr write 2 .
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READ and WRITE CDBs are satisfied with the specified backing store file.
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.Pp
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For performance, all backing store accesses use
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.Xr aio 4 .
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Thus,
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.Nm
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requires a kernel compiled with
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.Cd "options VFS_AIO" .
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.Pp
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Options:
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.Bl -tag -width indent
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.It Fl A
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Enable 16 addresses if supported by the SIM.
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Default is 8.
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.It Fl S
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Enable synchronous transfers if supported by the SIM.
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Default is disabled.
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.It Fl T
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Enable tagged queuing if supported by the SIM.
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Default is no tagged queuing.
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.It Fl W Cm 8 | 16 | 32
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Enable 16 or 32 bit wide transfers if supported by the SIM.
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Default is 8.
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.It Fl b Ar bufsize
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Set buffer size for transfers.
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Transfers larger than this will be split into multiple transfers.
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.It Fl c Ar sectorsize
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Set sector size for emulated volume.
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Default is 512.
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.It Fl d
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Enable debugging output in
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.Nm
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and its associated control device.
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.It Fl s Ar volsize
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Use a different size for the emulated volume.
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Must be less than or equal to the size of
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.Ar filename .
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.El
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.Pp
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Required arguments:
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.Bl -tag -width indent
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.It Ar bus : Ns Ar target : Ns Ar lun
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Attach to specified bus ID, target ID, and LUN.
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.It Ar filename
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File to use as a backing store.
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.El
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.Pp
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All options default to the minimal functionality of SCSI-1.
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To be safe,
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.Nm
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checks the SIM for the requested capability before enabling target mode.
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.Sh EXAMPLES
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Create a 5 megabyte backing store file.
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.Pp
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.Dl "dd if=/dev/zero of=vol size=1m count=5"
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.Pp
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Enable target mode on bus 0, target ID 1, LUN 0, using
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.Pa vol
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as the backing store for READ6/10 and WRITE6/10 commands.
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Only the first 1000 bytes of
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.Pa vol
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will be used.
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Debugging information will be output.
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16-bit wide transfers will be used if the SIM supports them.
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.Pp
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.Dl "scsi_target -d -v 1000 -W 16 0:1:0 vol"
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.Sh FILES
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.Bl -tag -width ".Pa /usr/share/examples/scsi_target" -compact
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.It Pa /dev/targ*
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Control devices.
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.It Pa /usr/share/examples/scsi_target
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Source directory.
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.El
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.Sh SEE ALSO
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.Xr scsi 4 ,
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.Xr targ 4
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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example first appeared in
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.Fx 3.0
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and was written by
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.An Justin T. Gibbs .
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It was rewritten for
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.Fx 5.0
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by
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.An Nate Lawson Aq nate@root.org .
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