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     tws — 3ware 9750 SATA+SAS 6Gb/s RAID controller card driver


     To compile this driver into the kernel, place the following lines in your kernel
     configuration file:

           device scbus
           device tws

     Alternatively, to load the driver as a module at boot time, place the following line in



     The tws driver provides support for LSI's 3ware 9750 SATA+SAS 6Gb/s RAID controller cards.

     These controllers feature the LSISAS2108 6Gb/s SAS RAID-on-Chip (ROC) and are available in
     4- and 8-port configurations, supports RAID levels 0, 1, 5, 6, 10, 50 and single disk, with
     96 SATA and/or SAS hard drives and SSDs.

     For further hardware information, see


     The tws driver supports the following SATA/SAS RAID controller:

        LSI's 3ware SAS 9750 series


     Tunables can be set at the loader(8) prompt before booting the kernel or stored in

     hw.tws.cam_depth       The maximum queued CAM SIM requests for one controller.  The default
                            value is 256.

     hw.tws.enable_msi      This tunable enables MSI support on the controller if set to a non-
                            zero value.  The default value is 0.

     hw.tws.queue_depth     The maximum queued requests for one controller.

     hw.tws.use_32bit_sgls  Limit the driver to use only 32-bit SG elements regardless whether
                            the operating system is running in 64-bit mode.  The default value is


     /dev/da?   array/logical disk interface
     /dev/tws?  management interface


     Whenever the driver encounters a command failure, it prints out an error code in the format:
     "ERROR: (<error source>: <error code>):", followed by a text description of the error.
     There are other error messages and warnings that the driver prints out, depending on the
     kinds of errors that it encounters.  If the driver is compiled with TWS_DEBUG defined, it
     prints out a whole bunch of debug messages.


     da(4), scsi(4)


     The tws driver was written by Manjunath Ranganathaiah for LSI and this manual page was
     written by Xin LI <> for iXsystems, Inc.