94 lines
3.2 KiB
Groff
94 lines
3.2 KiB
Groff
|
.\" Copyright (c) 2015, Mellanox Technologies, Inc. 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.
|
||
|
|
.\"
|
||
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 June 6, 2016
|
||
|
|
.Dt ISER 4
|
||
|
|
.Os
|
||
|
|
.Sh NAME
|
||
|
|
.Nm iser
|
||
|
|
.Nd iSCSI Extensions for RDMA driver
|
||
|
|
.Sh SYNOPSIS
|
||
|
|
To compile this driver into the kernel,
|
||
|
|
place the following line in the
|
||
|
|
kernel configuration file:
|
||
|
|
.Bd -ragged -offset indent
|
||
|
|
.Cd "device iser"
|
||
|
|
.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
|
||
|
|
iser_load="YES"
|
||
|
|
.Ed
|
||
|
|
.Sh DESCRIPTION
|
||
|
|
The
|
||
|
|
.Nm
|
||
|
|
(iSCSI Extensions for RDMA) initiator driver extends the iSCSI protocol to RDMA.
|
||
|
|
It permits data to be transferred directly into and out of SCSI buffers
|
||
|
|
without intermediate data copies.
|
||
|
|
iSER uses the RDMA protocol suite to supply higher bandwidth for
|
||
|
|
block storage transfers (zero copy behavior). To that fact, it eliminates the
|
||
|
|
TCP/IP processing overhead while preserving the compatibility with iSCSI protocol.
|
||
|
|
The initiator is the iSCSI/iSER client, which connects to an iSCSI/iSER target,
|
||
|
|
providing local access to a remote block device.
|
||
|
|
The userland component is provided by
|
||
|
|
.Xr iscsid 8
|
||
|
|
and both the kernel and userland are configured using
|
||
|
|
.Xr iscsictl 8 .
|
||
|
|
.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.iser.debug
|
||
|
|
Verbosity level for log messages from the
|
||
|
|
.Nm
|
||
|
|
driver.
|
||
|
|
Set to 0 to disable logging or 1 to warn about potential problems.
|
||
|
|
Larger values enable info and debugging output.
|
||
|
|
Defaults to 0.
|
||
|
|
.El
|
||
|
|
.Sh SEE ALSO
|
||
|
|
.Xr iscsi 4 ,
|
||
|
|
.Xr iscsi.conf 5 ,
|
||
|
|
.Xr iscsictl 8 ,
|
||
|
|
.Xr iscsid 8
|
||
|
|
.Sh HISTORY
|
||
|
|
The
|
||
|
|
.Nm
|
||
|
|
subsystem first appeared in
|
||
|
|
.Fx 11.0 .
|
||
|
|
.Sh AUTHORS
|
||
|
|
The
|
||
|
|
.Nm
|
||
|
|
subsystem was developed by
|
||
|
|
.An Max Gurtovoy Aq Mt maxg@mellanox.com
|
||
|
|
and
|
||
|
|
.An Sagi Grimberg Aq Mt sagig@mellanox.com
|
||
|
|
under sponsorship from Mellanox Technologies.
|