Data Domain: Connecting to the Data Domain System with a Serial Cable

A serial cable is used when a KVM is not available or the network interfaces are unreachable. In addition, Data Domain Support may require a serial connection for capturing the boot output in a log file for further analysis. This method requires physical access to the system.

Reasons a serial connection is needed:

• The system is unresponsive.
• A keyboard or monitor is not available.
• A remote session must debug the Data Domain system, and the network is not working.
• To boot the Data Domain system into Single User Mode.

Connecting to the System with a Terminal Emulator

Connect to a Data Domain system and run DD OS commands:

1. Connect a serial cable between your laptop and the Data Domain system. If necessary, also use a USB-to-DB-9 or a USB-to-DB-9 and DB-9 to Micro-DB-9 converter cable to your laptop.
2. Launch the terminal program on your laptop and configure the following communication settings:

Settings:
All supported models use these settings:

BAUD Rate	115200
Data Bits
8
Stop Bits	1
Parity	None
Flow Control	None
Emulation	VT-100

With the exception of DD2200, DD250,0 and older legacy models:

BAUD Rate	9600
Data Bits	8
Stop Bits	1
Parity	None
Flow Control	None
Emulation	VT-100

Connecting to the Data Domain System with a Serial Cable

Purpose:

This document provides instructions for connecting to a Data Domain System using a serial cable. A serial cable is used when a KVM is not available or the network interfaces are unreachable. In addition, Data Domain Support may require a serial connection for capturing the boot output in a log file for further analysis. This method requires physical access to the system.

Reasons a serial connection is needed:

• The system is unresponsive
• A keyboard or monitor is not available.
• A remote session must debug the Data Domain system, and the network is not working
• To boot the Data Domain system into Single User Mode

Applies to:

• All Data Domain Systems
• All Software Releases
• Serial "Null Modem" cable
• Terminal Emulator Software

Solution:

Requirements:

• A personal computer (or laptop device) running Terminal Emulator software (such as Microsoft HyperTerminal or PuTTY)
• A serial null modem  cable
• Possibly a USB port extender if you do not have a nine-pin serial port.

Steps:

1. Connect the serial null modem cable from the personal computer to the nine-pin serial port (DE9) located on the back of the Data Domain system.
2. On the personal computer, configure the terminal software to use the correct COM port with the following settings:
3. These settings must be configured prior to opening the session. They cannot be changed while the session is in-use!
   • Baud rate: 115200 or 9600 (depending on DD model)
   • Bits: 8
   • Parity: None
   • Stop Bits: 1
   • Flow Control: None
   • In addition to the above settings, set the Terminal Emulation type to: VT100

View this article for instructions on how to configure Microsoft's HyperTerminal: Data Domain - Configuring Microsoft's HyperTerminal (Login required)

If you do not see output, here are some things to try:

• Reconfigure the Terminal Emulator software choosing a different communication port.
• Try a different serial cable (null-modem).

Reference:

• PowerProtect and Data Domain Hardware Documents
• Troubleshooting Connecting to a Data Domain over a Network (Login required)
• Data Domain - Configuring Microsoft's HyperTerminal (Login Required)
• Data domain: How To Connect to a Data Domain System for Administration (Login required)

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