---
name: "tws"
section: "4freebsd"
platform: "linux"
package: "freebsd-manpages"
version: "12.2-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/tws/4freebsd"
---

# tws(4freebsd)

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

## 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)](/loader.conf/5.md):

```
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:

- LSI's 3ware SAS 9750 series

## LOADER TUNABLES

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

- *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\>):", 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.

## SEE ALSO

[da(4)](/da/4.md), [scsi(4)](/scsi/4.md)

## 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.