Add ioprbs(4) man page

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+.\"	$OpenBSD: ioprbs.4,v 1.1 2001/07/03 23:11:28 niklas Exp $
+.\"
+.\" Copyright (c) 2000 Niklas Hallqvist.  All rights reserved.
+.\"
+.\"
+.Dd July 4, 20010
+.Dt IOPRBS 4
+.Os
+.Sh NAME
+.Nm ioprbs
+.Nd I2O random block storage
+.Sh SYNOPSIS
+.Cd "ioprbs* at iop? tid ?"
+.Cd "scsibus* at ioprbs?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for I2O random block storages, like RAID-sets.
+So far only the following adapters has been tested:
+.Pp
+.Bl -tag -width -offset indent -compact
+.Tn Adaptec 2100S ,
+.Tn Adaptec 3200S .
+.El
+.Pp
+Although only those two adapters have been tested, the I2O interface is
+a generic one, and the driver should cope with all I2O random block
+storages with no further adaptions.
+.Pp
+The storage is presented to the system as SCSI disks for uniformity
+with other RAID controllers we support.  All RAID configuration is done
+through the controllers' BIOSes.
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr iop 4 ,
+.Xr iopsp 4 ,
+.Xr scsi 4 ,
+.Xr sd 4
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An Niklas Hallqvist Aq niklas@openbsd.org ,
+inspired by the NetBSD ld_iop driver by
+.An Andrew Doran Aq ad@netbsd.org .
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 3.0 .
+.Sh BUGS
+There currently is a boundary bug which sometime makes it impossible to
+fully use the last cylinder.  If you see diagnostics when building your
+filesystem, just shrink that partition a little.
+.Pp
+It is not yet possible to boot of an
+.Nm
+device.
+.Pp
+