Dell™ PowerEdge™ SC 420 Systems
Information Update
This document provides updated information for your system on the following topics:
•Processor speed
•Memory module installation guidelines
•Execute Disable feature
•Diagnostic indicator codes for memory configuration errors
•RAID Storage Manager application requires reboot after enabling write back cache
®
•RAID Storage Manager software not supported on Red Hat
•Removing the power supply
Processor Speed
The minimum clock speed for an Intel® Celeron® processor offered on this system is 2.53 GHz.
Memory Module Installation Guidelines
If only one memory module is installed, it must be:
•Installed in connector DIMM_1
•At least 256 MB
Linux operating systems
www.dell.com | support.dell.com
Execute Disable Feature
NOTE: Verify application and operating system support before enabling this feature.
Execute Disable (XD) is a new security feature that helps prevent code execution in certain
memory areas when combined with a supporting operating system and supporting applications.
Execute Disable memory protection can help prevent a class of viruses that use buffer overflow
attacks. Execute Disable is visible under
The feature must be enabled in System Setup and must be supported by system processors and
by the operating system to allow supporting applications to use it.
Execute Disable has two settings,
that Execute Disable Memory Protection Technology is on.
Memory Protection Technology is off.
Security Options
On
and
Off
in the F2 BIOS System Setup program.
, with On being the default setting. On indicates
Off
indicates that Execute Disable
May 2005
Diagnostics Indicator Codes for Memory Configuration Errors
The four diagnostics indicators on the system front panel display error codes during system
startup. Table 1 lists the one pattern associated with a memory configuration error. For a
comprehensive list of diagnostic indicator codes that apply to your system, see "Diagnostic
Indicator Codes" in the Dell PowerEdge SC420 Systems Installation and Troubleshooting Guide.
Table 1. Diagnostic Indicator Codes
CodeCausesCorrective Action
www.dell.com | support.dell.com
A B C D
= yellow
= green
= off
RAID Storage Manager Application Requires Reboot
NOTICE: For maximum data protection, it is recommended that the drive cache settings remain in
the default disabled (write-through) state.
On systems equipped with a supported SCSI controller, you must reboot the system after changing
the drive cache setting to write-back cache enabled. The reboot is required to make the change to
the drive cache effective.
Memory configuration
error.
See "Troubleshooting System Memory" in
your Installation and Troubleshooting Guide.
RAID Storage Manager Software
RAID Storage Manager software for Red Hat Linux is not supported on the PowerEdge SC420.
Removing the Power Supply
www.dell.com | support.dell.com
Figure 1 replaces Figure 6-2 in "Installing System Options" in the
Guide
. Only two screws are used to secure the power supply.
Figure 1. Removing the Power Supply and Cooling Fan
Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.
Trademarks used in this text: Dell, the DELL logo, and PowerEdge are trademarks of Dell Inc.; Intel and Celeron are registered
trademarks of Intel Corporation; Red Hat is a registered trademark of Red Hat, Inc.
Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names
or their products. Dell Inc. disclaims any proprietary interest in trademarks and trade names other than its own.
本文中使用的商标:Dell、DELL 徽标和 PowerEdge 是 Dell Inc. 的商标; Intel 和 Celeron 是 Intel Corporation
的注册商标; Red Hat 是 Red Hat, Inc. 的注册商标。
本文件中述及的其它商标和产品名称是指拥有相应商标和名称的公司或其制造的产品。Dell Inc. 对本公司的商标
和产品名称之外的其它商标和产品名称不拥有任何专有权。
Systèmes Dell™ PowerEdge™ SC 420
Mise à jour des informations
Ce document contient des informations mises à jour portant sur les sujets suivants :
•Vitesse du processeur
•Consignes d'installation des modules de mémoire
•Fonction XD (Execute Disable)
•Codes des voyants de diagnostic associés à des erreurs de configuration de la mémoire
•Redémarrage du système requis par RAID Storage Manager après l'activation du cache à écriture
différée
®
•Non prise en charge de RAID Storage Manager par les systèmes d'exploitation Red Hat
•Retrait du bloc d'alimentation
Vitesse du processeur
La vitesse d'horloge minimum d'un processeur Intel® Celeron® fourni avec le système est de 2,53 GHz.
Consignes d'installation des modules de mémoire
Si un seul module de mémoire est installé :
•Il doit être installé dans le connecteur DIMM_1.
•Il doit avoir une capacité minimale de 256 Mo.
Linux
www.dell.com | support.dell.com
Fonction XD (Execute Disable)
REMARQUE : vérifiez que les applications et le système d'exploitation prennent cette fonction
en charge avant de l'activer.
XD (Execute Disable) est une nouvelle fonction de sécurité qui empêche le code de s'exécuter dans
certaines zones mémoire. Elle ne fonctionne qu'avec un système d'exploitation et des applications
assurant sa prise en charge. Cette protection peut contribuer à bloquer les virus qui attaquent le système
en utilisant un dépassement de la mémoire tampon. L'option Execute Disable fait partie du menu
Security Options
touche F2. Pour pouvoir être utilisée, elle doit être activée dans le programme de configuration et prise
en charge par les processeurs ainsi que par le système d'exploitation.
L'option Execute Disable dispose uniquement de deux paramètres,
L'option
et l'option
On
(Options de sécurité) du programme de configuration du BIOS, accessible par la
On
(valeur par défaut) et
indique que la technologie de protection de la mémoire Execute Disable est activée,
Off
qu'elle est désactivée.
Off
.
Mai 2005
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