---
name: "sg_rdac"
section: "8"
platform: "linux"
package: "sg3_utils"
version: "1.49-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/sg_rdac"
---

# sg\_rdac(8)

display or modify SCSI RDAC Redundant Controller mode page

## 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 individual drives to the controller the command was received on.

## OPTIONS

- **-6**

  Use the 6 byte cdb variants of the SCSI MODE SENSE and MODE SELECT commands. The default action (in the absence of this option) is to use the 10 byte cdb variants.

- **-a**

  Transfer all (visible) devices

- **-f**=*LUN*

  Transfer the device identified by *LUN*. This command will only work if the controller 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**

  be verbose

- **-V**

  print version string then exit

## EXIT STATUS

The exit status of sg\_rdac is 0 when it is successful. Otherwise see the [sg3\_utils(8)](/sg3_utils/8.md) 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 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.