xref: /freebsd/share/man/man4/cfiscsi.4 (revision 4b2a6604fc31972417a933c3186ea8d25a8f14b1)

.\" Copyright (c) 2013 Edward Tomasz Napierala
.\" Copyright (c) 2015-2017 Alexander Motin <mav@FreeBSD.org>
.\" Copyright (c) 2017 Ngie Cooper <ngie@FreeBSD.org>
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.Dd May 28, 2017
.Dt CFISCSI 4
.Os
.Sh NAME
.Nm cfiscsi
.Nd CAM Target Layer iSCSI target frontend
.Sh SYNOPSIS
To compile this driver into the kernel,
place the following lines in your
kernel configuration file:
.Bd -ragged -offset indent
.Cd "device cfiscsi"
.Cd "device ctl"
.Cd "device iscsi"
.Ed
.Pp
Alternatively, to load the driver as a
module at boot time, place the following line in
.Xr loader.conf 5 :
.Bd -literal -offset indent
cfiscsi_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
subsystem provides the kernel component of an iSCSI target.
The target is the iSCSI server, providing LUNs backed by local files
and volumes to remote initiators.
The userspace component is provided by
.Xr ctld 8 .
.Nm
is implemented as a
.Xr ctl 4
frontend and uses infrastructure provided by
.Xr iscsi 4 .
.Sh SYSCTL VARIABLES
The following variables are available as both
.Xr sysctl 8
variables and
.Xr loader 8
tunables:
.Bl -tag -width indent
.It Va kern.cam.ctl.iscsi.debug
Verbosity level for log messages from the kernel part of iSCSI target.
Set to 0 to disable logging or 1 to warn about potential problems.
Larger values enable debugging output.
Defaults to 1.
.It Va kern.cam.ctl.iscsi.maxtags
The number of outstanding commands to advertise to each iSCSI initiator.
Current implementation is not very accurate, so do not set this below 2.
Defaults to 256.
.It Va kern.cam.ctl.iscsi.ping_timeout
The number of seconds to wait for the iSCSI initiator to respond to a NOP-In
PDU.
In the event that there is no response within that time the session gets
forcibly terminated.
Set to 0 to disable sending NOP-In PDUs.
Defaults to 5.
.El
.Sh SEE ALSO
.Xr ctl 4 ,
.Xr iscsi 4 ,
.Xr ctl.conf 5 ,
.Xr ctld 8
.Sh HISTORY
The
.Nm
subsystem first appeared in
.Fx 10.0
as part of the
.Xr ctl 4
driver.
It was split off of
.Xr ctl 4
in
.Fx 12.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
subsystem was developed by
.An Edward Tomasz Napierala Aq Mt trasz@FreeBSD.org
under sponsorship from the FreeBSD Foundation.
This manual page was written by
.An Ngie Cooper Aq Mt ngie@FreeBSD.org .