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500 IBM BladeCenter JS23 and JS43 Implementation Guide

Figure A-6 Remote control - remote console and remote disk

Serial Over LAN

Serial over LAN (SOL) provides a means to manage servers remotely by using a

command-line interface (CLI) over a Telnet or secure shell (SSH) connection.

SOL is required to manage servers that do not have KVM support. SOL provides

console redirection for both BIOS and the blade server operating system. The

SOL feature redirects server serial-connection data over a LAN without the need

for special cabling. The SOL connection enables blade servers to be managed

from any remote location with network access. The advantages of SOL include:

򐂰 Remote administration without keyboard, video, or mouse (headless servers)

򐂰 Reduced cabling and no need for a serial concentrator

򐂰 Standard Telnet interface that eliminates the need for special client software

The IBM BladeCenter management module command-line interfaces provide

access to the text-console command prompt on each blade server through an

SOL connection, enabling the blade servers to be managed from a remote

location.

In the BladeCenter environment, the integrated system management processor

(ISMP) and network interface controller (NIC) on each blade server route the

serial data from the blade server serial communications port to the network

infrastructure of the BladeCenter unit, including an Ethernet-compatible I/O

module that supports SOL communication. BladeCenter components are

configured for SOL operation through the BladeCenter management module.

The management module also acts as a proxy in the network infrastructure to

couple a client running a Telnet or SSH session with the management module to

an SOL session running on a blade server, enabling the Telnet or SSH client to

interact with the serial port of the blade server over the network.

Because all SOL traffic is controlled by and routed through the management

module, administrators can segregate the management traffic for the

BladeCenter unit from the data traffic of the blade servers. To start an SOL

connection with a blade server, first start a Telnet command-line interface

session with the management module. When this Telnet or SSH command-line

interface session is running, you can start a remote-console SOL session with

any blade server in the BladeCenter unit that is set up and enabled for SOL

operation.

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