1.\" $OpenBSD: sym.4,v 1.2 2011/04/06 12:47:24 jmc Exp $ 2.\" 3.\" Copyright (c) 2011 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 6 2011 $ 18.Dt SYM 4 19.Os 20.Sh NAME 21.Nm sym 22.Nd symmetric access SCSI devices 23.Sh SYNOPSIS 24.Cd "sym* at scsibus?" 25.Sh DESCRIPTION 26The 27.Nm 28driver attaches to SCSI logical units that support symmetric access, 29i.e. all paths to the device are as good as each other. 30Each path attached to by 31.Nm 32is presented to 33.Xr mpath 4 34which uses it as a backend to the logical unit attached to its own 35.Xr scsibus 4 . 36.Sh SEE ALSO 37.Xr ioctl 2 , 38.Xr intro 4 , 39.Xr mpath 4 , 40.Xr scsi 4 41.Sh HISTORY 42The 43.Nm 44driver first appeared in 45.Ox 5.0 . 46.Sh AUTHORS 47.An David Gwynne Aq dlg@openbsd.org . 48