TWE(4)                    OpenBSD Programmer's Manual                   TWE(4)

NAME
     twe - 3ware 5000/6000/7000/8000 series PATA/SATA RAID controller

SYNOPSIS
     twe* at pci?
     scsibus* at twe?

DESCRIPTION
     The twe driver provides support for AMCC's 3ware 5000/6000/7000/8000 se-
     ries PATA/SATA RAID adapters.  These adapters were formerly known as
     ``3ware Escalade''.

     These controllers support 2, 4, 8, or 12 ATA disk drives and provide RAID
     0, RAID 1, RAID 5, RAID 10, and JBOD configurations.  All the RAID set
     volume management is done via the card's BIOS.

     Even though the card uses ATA drives, this driver makes drives and/or
     RAID sets appear as sd(4).

     The twe driver supports the following AMCC 3ware PATA/SATA RAID adapters:

     5000 series, 6000 series, 7000-2, 7006-2, 7500-4LP, 7500-8, 7500-12,
     7506-4LP, 7506-8, 7506-12, 8006-2LP, 8500-4LP, 8500-8, 8500-12, 8506-4LP,
     8506-8, 8506-8MI, 8506-12, and 8506-12MI.

SEE ALSO
     intro(4), pci(4), scsi(4), sd(4)

HISTORY
     The twe driver first appeared in OpenBSD 2.8.

AUTHORS
     The twe driver was written by Michael Shalayeff <mickey@openbsd.org>, in-
     spired by the FreeBSD driver by Mike Smith <msmith@freebsd.org>.

BUGS
     The card's BIOS seems to conflict with some other disk controllers which
     have their own BIOS, if such devices are configured earlier than this
     one.  To avoid this situation, place twe cards in the lowest numbered
     slot before other SCSI or RAID disk controllers.

     The current 3ware firmware is known to fail if a redundant configuration
     is selected (RAID1 or RAID10) and the array is heavily used (e.g. instal-
     lation) before the controller has finished initializing the array.  In
     this case, create the array, boot the installation media, and leave the
     array idle until all controller activity has ceased.

     None of the volume management or monitoring functions provided by the
     card's firmware are supported due to the fact that information on these
     functions is not public.

OpenBSD 4.7                      May 31, 2007                                1
