My first SAS..a simple question.

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LEARN ABOUT FREEBSD

tws

TWS(4)							   BSD Kernel Interfaces Manual 						    TWS(4)

NAME

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

SYNOPSIS

     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 loader.conf(5):

	   tws_load="YES"

DESCRIPTION

     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 http://www.lsi.com/.

HARDWARE

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

     o	 LSI's 3ware SAS 9750 series

LOADER TUNABLES

     Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5).

     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 0.

FILES

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

DIAGNOSTICS

     Whenever the driver encounters a command failure, it prints out an error code in the format: "ERROR: (<error source>: <error code>):", fol-
     lowed 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.

SEE ALSO

     da(4), scsi(4)

AUTHORS

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

BSD
								  October 4, 2011							       BSD

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