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.\" $OpenBSD: twe.4,v 1.1 2000/09/15 18:08:01 mickey Exp $
.\"
.\" Copyright (c) 2000 Michael Shalayeff. All rights reserved.
.\"
.\"
.Dd September 15, 2000
.Dt TWE 4
.Os
.Sh NAME
.Nm twe
.Nd
.Tn 3ware Escalade RAID driver
.Sh SYNOPSIS
.Cd "twe* at pci? dev ? function ?"
.Cd "scsibus* at twe?"
.Sh DESCRIPTION
The
.Nm
driver provides support for Escalade family of raid controllers,
including the
.Tn 3W-5x000 and
.Tn 3W-6x000
models.
.Pp
Controllers support RAID 0, RAID 1, RAID 10 and JBOD
configurations. All the RAID set volume management is done
through the cards BIOS.
.Pp
Even though the card uses IDE drives, this driver makes drives
and/or RAID sets appear as
.Xr sd 4 .
.Sh SEE ALSO
.Xr intro 4 ,
.Xr scsi 4 ,
.Xr sd 4
.Sh AUTHOR
The
.Nm
driver was written by
.An Michale Shalayeff Aq mickey@opensbd.org ,
inspired by the FreeBSD driver by
.An Mike Smith Aq msmith@freebsd.org .
.Sh HISTORY
The
.Nm
driver first appeared in
.Ox 2.8 .
.Sh BUGS
The card's BIOS seem to conflict w/ other disk controllers with
own BIOS if later are configured earlier than this one.
To avoid that put the card in the lowest slot before other
SCSI or RAID disk controllers, if possible.
.Pp
The card provides mechanism to receive asynchronous notifications
about RAID set status change and so forth, unfortunately this
information is not public.
.Pp
The card requires data buffers to be aligned to 512 bytes, which
is not always provided by the
.Ox
kernel.
To work around that double-buffering is used, allocating aligned
buffer when required and copying data back and forth as needed.
Unaligned buffers are very rare occasion, but if not handled properly
makes the card comatose.
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