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.\" $OpenBSD: mpath.4,v 1.6 2013/07/16 16:05:49 schwarze Exp $
.\"
.\" Copyright (c) 2009 David Gwynne <dlg@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: July 16 2013 $
.Dt MPATH 4
.Os
.Sh NAME
.Nm mpath
.Nd SCSI multipath
.Sh SYNOPSIS
.Cd "emc* at scsibus?"
.Cd "hds* at scsibus?"
.Cd "rdac* at scsibus?"
.Cd "sym* at scsibus?"
.Pp
.Cd "mpath0 at root"
.Sh DESCRIPTION
.Nm
provides access, I/O multiplexing, and failover support to SCSI
logical units that can have multiple physical connections to the
system.
It uses connections presented by path drivers, for example
.Xr sym 4 ,
as backends to a single device attached to its own
.Xr scsibus 4 .
.Sh SEE ALSO
.Xr ioctl 2 ,
.Xr emc 4 ,
.Xr hds 4 ,
.Xr intro 4 ,
.Xr rdac 4 ,
.Xr scsi 4 ,
.Xr sym 4
.Sh HISTORY
The
.Nm
driver first appeared in
.Ox 4.7 .
.Sh AUTHORS
.An David Gwynne Aq Mt dlg@openbsd.org .
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