# man > sg_rdac(8)

[SG_RDAC(8)](https://www.chedong.com/phpMan.php/man/SGRDAC/8/markdown)                                    SG3_UTILS                                   [SG_RDAC(8)](https://www.chedong.com/phpMan.php/man/SGRDAC/8/markdown)



## NAME
       sg_rdac - display or modify SCSI RDAC Redundant Controller mode page

## SYNOPSIS
       **sg**___**rdac** [_-6_] [_-a_] [_-f=LUN_] [_-v_] [_-V_] _DEVICE_

## DESCRIPTION
       sg_rdac  displays  or modifies the RDAC controller settings via the Redundant Controller mode
       page (0x2C). When modifying the settings it allows one to transfer the ownership of  individ‐
       ual drives to the controller the command was received on.

## OPTIONS
### -6
              fault action (in the absence of this option) is to use the 10 byte cdb variants.

### -a

### -f
              supports  'Dual  Active Mode' (aka active/active mode).  _LUN_ is a decimal number which
              cannot exceed 31 when the _-6_ option is given, otherwise is cannot exceed 255.

### -v

### -V

## EXIT STATUS
       The exit status of sg_rdac is 0 when it is successful. Otherwise  see  the  [sg3_utils(8)](https://www.chedong.com/phpMan.php/man/sg3utils/8/markdown)  man
       page.

## AUTHOR
       Written by Hannes Reinecke <hare at suse dot com>, based on sg_emc_trespass.

## REPORTING BUGS
       Report bugs to <dgilbert at interlog dot com>.

## COPYRIGHT
       Copyright © 2006-2017 Hannes Reinecke, Douglas Gilbert.
       This software is distributed under the GPL version 2. There is NO warranty; not even for MER‐
       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.



sg3_utils-1.43                              November 2017                                 [SG_RDAC(8)](https://www.chedong.com/phpMan.php/man/SGRDAC/8/markdown)