Advanced Lights Out Manager: Obtaining the console through the Net Management interface

Asset ID:	1-71-1011090.1
Update Date:	2012-09-17
Keywords:

Solution Type Technical Instruction Sure

Solution 1011090.1 : Advanced Lights Out Manager: Obtaining the console through the Net Management interface

Applies to:

Sun Fire V440 Server - Version All Versions to All Versions [Release All Releases]
Sun Fire V215 Server - Version All Versions to All Versions [Release All Releases]
Sun Fire V240 Server - Version All Versions to All Versions [Release All Releases]
Sun Fire V210 Server - Version All Versions to All Versions [Release All Releases]
Sun Fire V250 Server - Version All Versions to All Versions [Release All Releases]
All Platforms

Goal

Description

This document better explains the purpose of the "console -f" command available in the ALOM.

To configure the "NET MGT" Port (ALOM (Advanced Lights Out Manager) Ethernet) please check:

Technical Instruction

<Document: 1004884.1>: How To Configure the "NET MGT" Port (ALOM (Advanced Lights Out Manager) Ethernet) Port.

Fix

Steps to Follow

When ALOM POST completes, and host system is powered up or Solaris[TM] is either booting or running, the serial line takes the console write permission automatically, i.e will never ask for login or gives an ALOM prompt, rather it will give a system login prompt. This is especially true for a new and headless system unless the OBP input-device and output-device parameters were previously changed to some other values.

If the net management interface is configured, telneting to it and doing a 'showusers' will show:

sc> showusers
username         connection       login time       client IP addr   console
--------         ----------       ----------       --------------   -------
serial           MAR 17 00:02                      system
admin            net-1            MAR 16 23:58     192.168.1.2

This indicates that there is an unknown user on the serial port that has the console write access. For the admin user from net-1 to have console write access, the user must issue the 'console -f' command.

sc> console -f
Warning: User < > currently has write permission to this console and
forcibly removing them will terminate any current write actions and all work
will be lost.  Would you like to continue? [y/n]y
console login:

It is important to note that if there is really a need to steal the console on the net management connection, it must be ensured that there is no real console user doing something in the serial port. A user using a telnet connection will always have to use -f option to obtain the console write lock.

Product
Lights Out Management Module
Sun Fire V440 Server
Sun Fire V250 Server
Sun Fire V240 Server
Sun Fire V210 Server

Internal Comments
For further information, refer to the following document:

Technical Instruction, doc 1010822.1: Understand the default behavior of ALOM serial port
ALOM, V240, V440, V210, V250, console, tip, hardwire, LOM
Previously Published As
83073

Change History
Date: 2012-08-08
User Name: Silvana Villamil
Action: process comments
Comment: - audited/updated by Silvana Villamil, Entry Level SPARC Content Team Member
Publishing
Version: 4

References

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