1.\" $OpenBSD: mpath.4,v 1.4 2011/04/28 03:03:41 dlg Exp $ 2.\" 3.\" Copyright (c) 2009 David Gwynne <dlg@openbsd.org> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: April 28 2011 $ 18.Dt MPATH 4 19.Os 20.Sh NAME 21.Nm mpath 22.Nd SCSI multipath 23.Sh SYNOPSIS 24.Cd "emc* at scsibus?" 25.Cd "hds* at scsibus?" 26.Cd "rdac* at scsibus?" 27.Cd "sym* at scsibus?" 28.Pp 29.Cd "mpath0 at root" 30.Cd "scsibus* at mpath?" 31.Sh DESCRIPTION 32.Nm 33provides access, I/O multiplexing, and failover support to SCSI 34logical units that can have multiple physical connections to the 35system. 36It uses connections presented by path drivers, for example 37.Xr sym 4 , 38as backends to a single device attached to its own 39.Xr scsibus 4 . 40.Sh SEE ALSO 41.Xr ioctl 2 , 42.Xr emc 4 , 43.Xr hds 4 , 44.Xr intro 4 , 45.Xr rdac 4 , 46.Xr scsi 4 , 47.Xr sym 4 48.Sh HISTORY 49The 50.Nm 51driver first appeared in 52.Ox 4.7 . 53.Sh AUTHORS 54.An David Gwynne Aq dlg@openbsd.org . 55