mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-16 10:20:30 +00:00
159 lines
4.4 KiB
Groff
159 lines
4.4 KiB
Groff
.\" Copyright (c) 2002
|
|
.\" Nate Lawson. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. Neither the name of the author nor the names of any co-contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY Nate Lawson AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" 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
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd November 15, 2002
|
|
.Dt SCSI_TARGET 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm scsi_target
|
|
.Nd usermode SCSI disk emulator
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl AdST
|
|
.Op Fl b Ar size
|
|
.Op Fl c Ar size
|
|
.Op Fl s Ar size
|
|
.Op Fl W Ar num
|
|
.Ar bus : Ns Ar target : Ns Ar lun
|
|
.Ar filename
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility emulates a SCSI target device using the
|
|
.Xr targ 4
|
|
device driver.
|
|
It supports the basic commands of a direct access device, like
|
|
.Xr da 4 .
|
|
In typical operation, it opens a control device and
|
|
enables target mode for the specified LUN.
|
|
It then communicates with
|
|
the SIM using CCBs exchanged via
|
|
.Xr read 2
|
|
and
|
|
.Xr write 2 .
|
|
READ and WRITE CDBs are satisfied with the specified backing store file.
|
|
.Pp
|
|
For performance, all backing store accesses use
|
|
.Xr aio 4 .
|
|
Thus,
|
|
.Nm
|
|
requires a kernel compiled with
|
|
.Cd "options VFS_AIO" .
|
|
.Pp
|
|
Options:
|
|
.Bl -tag -width indent
|
|
.It Fl A
|
|
Enable 16 addresses if supported by the SIM.
|
|
Default is 8.
|
|
.It Fl S
|
|
Enable synchronous transfers if supported by the SIM.
|
|
Default is disabled.
|
|
.It Fl T
|
|
Enable tagged queuing if supported by the SIM.
|
|
Default is no tagged queuing.
|
|
.It Fl W Cm 8 | 16 | 32
|
|
Enable 16 or 32 bit wide transfers if supported by the SIM.
|
|
Default is 8.
|
|
.It Fl b Ar bufsize
|
|
Set buffer size for transfers.
|
|
Transfers larger than this will be split into multiple transfers.
|
|
.It Fl c Ar sectorsize
|
|
Set sector size for emulated volume.
|
|
Default is 512.
|
|
.It Fl d
|
|
Enable debugging output in
|
|
.Nm
|
|
and its associated control device.
|
|
.It Fl s Ar volsize
|
|
Use a different size for the emulated volume.
|
|
Must be less than or equal to the size of
|
|
.Ar filename .
|
|
If the number ends with a
|
|
.Dq Li k ,
|
|
.Dq Li m ,
|
|
.Dq Li g ,
|
|
.Dq Li t ,
|
|
.Dq Li p ,
|
|
or
|
|
.Dq Li e ,
|
|
the number is multiplied by 2^10 (1K), 2^20 (1M), 2^30 (1G), 2^40 (1T),
|
|
2^50 (1P) and 2^60 (1E)
|
|
respectively.
|
|
.El
|
|
.Pp
|
|
Required arguments:
|
|
.Bl -tag -width indent
|
|
.It Ar bus : Ns Ar target : Ns Ar lun
|
|
Attach to specified bus ID, target ID, and LUN.
|
|
.It Ar filename
|
|
File to use as a backing store.
|
|
.El
|
|
.Pp
|
|
All options default to the minimal functionality of SCSI-1.
|
|
To be safe,
|
|
.Nm
|
|
checks the SIM for the requested capability before enabling target mode.
|
|
.Sh FILES
|
|
.Bl -tag -width ".Pa /usr/share/examples/scsi_target" -compact
|
|
.It Pa /dev/targ*
|
|
Control devices.
|
|
.It Pa /usr/share/examples/scsi_target
|
|
Source directory.
|
|
.El
|
|
.Sh EXAMPLES
|
|
Create a 5 megabyte backing store file.
|
|
.Pp
|
|
.Dl "dd if=/dev/zero of=vol size=1m count=5"
|
|
.Pp
|
|
Enable target mode on bus 0, target ID 1, LUN 0, using
|
|
.Pa vol
|
|
as the backing store for READ6/10 and WRITE6/10 commands.
|
|
Only the first 1000 bytes of
|
|
.Pa vol
|
|
will be used.
|
|
Debugging information will be output.
|
|
16-bit wide transfers will be used if the SIM supports them.
|
|
.Pp
|
|
.Dl "scsi_target -d -s 1000 -W 16 0:1:0 vol"
|
|
.Sh SEE ALSO
|
|
.Xr scsi 4 ,
|
|
.Xr targ 4
|
|
.Sh AUTHORS
|
|
.An -nosplit
|
|
The
|
|
.Nm
|
|
example first appeared in
|
|
.Fx 3.0
|
|
and was written by
|
|
.An Justin T. Gibbs .
|
|
It was rewritten for
|
|
.Fx 5.0
|
|
by
|
|
.An Nate Lawson Aq Mt nate@root.org .
|