NAME    [Toc]    [Back]

     twe - 3ware Escalade RAID driver

SYNOPSIS    [Toc]    [Back]

     twe* at pci? dev ? function ?
     scsibus* at twe?

DESCRIPTION    [Toc]    [Back]

     The twe driver provides support for Escalade family of  RAID
controllers,
     including the 3W-5x00 and 3W-6x00 models.

     These  controllers  support RAID 0, RAID 1, RAID 10 and JBOD
configurations.
  All the RAID set volume management is done  via  the
card BIOS.

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

SEE ALSO    [Toc]    [Back]

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

HISTORY    [Toc]    [Back]

     The twe driver first appeared in OpenBSD 2.8.

AUTHORS    [Toc]    [Back]

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

BUGS    [Toc]    [Back]

     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. installation)
 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 volumes management or monitoring functions, provided by the
     card's  firmware, is supported due to the fact that information on these
     functions is not public.

     Only 3W-5400 was tested, but others should work.

OpenBSD     3.6                       September     15,      2000