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NAME
     mlx - low-level module for  Mylex  DAC960E  EISA  and  Mylex
     DAC960P/PD/PD-Ultra/PL PCIhost bus adapter series

SYNOPSIS
     /kernel/drv/mlx

DESCRIPTION
     The mlx module provides low-level interface routines between
     the  common  disk/tape  I/O subsystem and the Mylex DAC960E,
     and DAC960P/PD/PD-Ultra/PL controllers. The mlx  module  can
     be  configured  for disk, CD-ROM, and streaming tape support
     for one or more host adapter boards.

CONFIGURATION
     Auto-configuration code determines whether  the  adapter  is
     present  at the configured address and what types of devices
     are attached to it. The Mylex  DAC960E  and   DAC960P/PD/PD-
     Ultra/PL  are  primarily  used  as disk array (system drive)
     controllers. In order to configure the attached disk arrays,
     the  controller  must  first  be configured prior to Solaris
     boot using  the  configuration  utilities  provided  by  the
     hardware  manufacturer.  With  these utilities, the user can
     set different levels  of  redundant  arrays  of  independent
     disks  (RAID),  striping parameters, caching mechanisms, and
     so on. For more information, refer to the user's manual sup-
     plied with your hardware.

  Configuration Tips
     The Mylex DAC960E and  DAC960P/PD/PD-Ultra/PL BIOS can  han-
     dle  multiple  cards.  Therefore,  if  more  than  one Mylex
     DAC960Ea or  DAC960P/PD/PD-Ultra/PL, adapter is installed in
     a system, only the BIOS of the one in the lowest slot should
     be enabled and the BIOS in any other adapter should be  dis-
     abled.

     Enable tag queueing only for the SCSI disk drives  that  are
     officially  tested  and  approved  by  Mylex  Corp.  for the
     DAC960E  and  DAC960P/PD/PD-Ultra/PL.   Otherwise,   it   is
     strongly  recommended that you disable tag queueing to avoid
     serious problems.

  Board Configuration and Auto Configuration
     The SCSI ID of the devices on each channel may not be  equal
     to  or  greater than the value of the maximum number of tar-
     gets allowed per channel (MAX_TGT), or  it  cannot  even  be
     configured.

  Access to Ready/Standby Drives
     When a SCSI disk drive is initially connected  to  the  con-
     troller,  it is marked as ready. If a SCSI disk drive is not
     defined to be part of any  physical  pack  within  a  system
     drive  at configuration time, it is automatically labeled as
     a standby drive, which may be used by the controller at  any
     time for automatic failover. For this reason, standby drives
     are inaccessible from the mlx driver, and the use  of  ready
     drives  is strongly discouraged. Independent access to ready
     drives will be removed in an upcoming release.

FILES
     /kernel/drv/mlx.conf
           mlx configuration file

ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:

     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Architecture                | IA                          |
    |_____________________________|_____________________________|


SEE ALSO
     attributes(5)

WARNINGS
  Limitations on SCSI Device Use
     Due to Mylex firmware limitations, a tape blocksize  greater
     than  32k  bytes  cannot  be  used.  Also,  tapes and CD-ROM
     players will not work reliably on channels  that  also  have
     SCSI  hard drives attached to them. Therefore, to be certain
     of correct  SCSI device operation, use SCSI devices only  on
     an otherwise unused channel, and with a  fixed block size of
     32k or less.

     Finally, note that any SCSI command  which  takes  over  one
     hour will automatically be aborted by the Mylex firmware, so
     very long tape commands (such as erasing a large  tape)  may
     fail.

  Tag Queueing
     Enable tag queueing only for the SCSI disk drives which  are
     officially  tested  and  approved  by  Mylex  Corp.  for the
     DAC960E  and  DAC960P/PD/PD-Ultra/PL.   Otherwise,   it   is
     strongly  recommended to disable tag queueing to avoid seri-
     ous problems.

  Ready and Standby Drives
     If a SCSI disk drive is not defined to be part of any physi-
     cal  pack within a system drive, it is labeled as a ready or
     standby drive. If any SCSI disk drive within a system  drive
     fails,  data  on  a  standby  drive  may  be lost due to the
     standby replacement procedure. This procedure will overwrite
     the  standby  drive  if  the failed disk drive is configured
     with any level of redundancy (RAID levels 1, 5, and  6)  and
     its  size  is identical to the size of the available standby
     drive.

     Therefore, despite the  fact  that  the  ready  and  standby
     drives are  physically connected, the system denies any kind
     of access to them,  so that  there  will  be  no  chance  of
     accidental loss of valuable data.

  Hot Plugging
     Other than the "hot replacement" of disk  drives,  which  is
     described  in  the  manufacturer's  user's  guide, the Mylex
     DAC960E series do  not  support  "hot-plugging"  (adding  or
     removing  devices  while  the  system is running) unless the
     firmware version of the adapter is 1.22 or 1.23.  Otherwise,
     in  order  to  add or remove devices, you must shut down the
     system, add or remove  devices,  reconfigure  the  host  bus
     adapter  using  the  configuration  utility  provided by the
     manufacturer, and then reboot your system.

  SCSI Target IDs
     When setting up the device SCSI target IDs, note that  there
     is a limitation on the choice of target ID numbers. Assuming
     the maximum number of targets per channel on the  particular
     model  of  Mylex or IBM host bus adapter is MAX_TGT (see the
     manufacturer's user's manual), the  SCSI  target  IDs  on  a
     given  channel  should  range  from 0 to (MAX_TGT - 1). Note
     that target SCSI IDs on one channel can be repeated on other
     channels.

        o  Mylex DAC960-5 model supports a maximum of  four  tar-
           gets per channel, that is, MAX_TGT = 4. Therefore, the
           SCSI target IDs on a given channel should range from 0
           to 3.

        o  Mylex DAC960-3 model supports a maximum of seven  tar-
           gets per channel, that is, MAX_TGT = 7. Therefore, the
           SCSI target IDs on a given channel should range from 0
           to 6.

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