HP 117755-003 - ProSignia - 740 Manuel utilisateur

Error Prevention Guide

August 2003 (First Edition)

Part Number 335894-001

HP CONFIDENTIAL

Writer: Ted Weiman File Name: 335894-1.doc

Codename: Part Number: 335894-001 Last Saved On: 7/28/03 8:48 AM

Hewlett-Packard Company shall not be liable for technical or editorial errors or omissions

contained herein. The information in this document is provided “as is” without warranty of

any kind and is subject to change without notice. The warranties for HP products are set forth

in the express limited warranty statements accompanying such products. Nothing herein

should be construed as constituting an additional warranty.

Error Prevention Guide

August 2003 (First Edition)

Part Number 335894-001

HP CONFIDENTIAL

Writer: Ted Weiman File Name: 335894-1.doc

Codename: Part Number: 335894-001 Last Saved On: 7/28/03 8:48 AM

Contents

Abstract.......................................................................................................... 5

Audience Assumptions ................................................................................ 5

Preparing for Changes.................................................................................. 5

Minimizing the Impact of Changes .............................................................. 6

Version Control .................................................................................................................. 6

Server Design ..................................................................................................................... 6

Software Updates ............................................................................................................... 6

Using a Methodology .................................................................................... 7

Visually Checking the Server ....................................................................... 8

Recognizing Power Problems Caused by Acts of Nature ......................... 9

Preventing Power Management Problems................................................ 10

General Power Requirements........................................................................................... 10

Power Consumption Considerations ................................................................................ 10

Power Supply Considerations........................................................................................... 11

Power Redundancy Considerations.................................................................................. 11

Preventing Damage to Removable Drives ................................................ 11

Preventing Electrostatic Damage .............................................................. 12

Preventing Cable Damage .......................................................................... 12

Preventing Tape Drive Errors..................................................................... 12

HP StorageWorks Library and Tape Tools ...................................................................... 12

Cleaning Drives................................................................................................................ 13

DAT Drives.................................................................................................................13

LTO, SDLT, and DLT Drives.....................................................................................13

AIT Drives ..................................................................................................................13

Error Prevention Guide 3

HP CONFIDENTIAL

Writer: Ted Weiman File Name: 335894-1.doc

Codename: Part Number: 335894-001 Last Saved On: 7/28/03 8:48 AM

Abstract

This guide provides information to help you avoid future system problems. While

many of the pointers provided are common-sense suggestions, these prevention tasks

are too important to overlook.

Audience Assumptions

This guide is for the person who installs, administers, and troubleshoots servers. HP

assumes you are qualified in the servicing of computer equipment and trained in

recognizing hazards in products with hazardous energy levels.

Preparing for Changes

Most problems occur when something in the server system has been changed. Follow

these tips when making any changes to the server:

• Back up the system often. Be sure that the backups are not corrupted before

making changes. If the system contains valuable data, have at least two complete

known functional backups of the operating system and data, a copy of the backup

software, and a functional tape drive that can read the backup. Two backups

ensure complete data recovery in the event that something happens to the first

tape or during the first restore attempt.

• Document the system settings. If the system configuration will be changed, first

obtain a record of the current system configuration settings using the Survey

Utility.

• Check the HP resources, the software documentation, and third-party product

documentation for information about potential problems. Websites are excellent

places to find this information.

• If possible, make changes one at a time. This minimizes variables and maintains

a controlled environment.

• Record the results of each change after it is executed, being sure to include any

error messages or additional information collected.

Error Prevention Guide 5

HP CONFIDENTIAL

Writer: Ted Weiman File Name: 335894-1.doc

Codename: Part Number: 335894-001 Last Saved On: 7/28/03 8:48 AM

• Be sure that you allow enough time to make the changes.

• Check for potential device conflicts before adding a device.

• If a fixed cable tray or other cable routing system is available for the server,

using this system can help prevent loose cabling and damage to cables that can

result from improper disconnection.

Minimizing the Impact of Changes

Version Control

Keep track of new versions of system software with the version control feature of

Insight Manager 7. Using this feature, you can easily determine whether version

updates are available for server BIOS, drivers, and agents.

Server Design

Design the server setup to minimize the impact of downtime. For example, on

enterprise class servers, high availability features such as Hot-Pluggable RAID

memory functionality and Hot-Plug PCI slots effectively minimize the amount of

downtime experienced due to memory or PCI card upgrades. If possible, divide the

workload between several machines rather than just one. If you can, group users

across different servers in the network. Anticipate the utilization rate and distribute

servers based on that rate.

Software Updates

Stay aware of the latest software updates for the operating system and applications,

and update software for fixes that you require.

6Error Prevention Guide

HP CONFIDENTIAL

Writer: Ted Weiman File Name: 335894-1.doc

Codename: Part Number: 335894-001 Last Saved On: 7/28/03 8:48 AM

Using a Methodology

Following a set of procedures when using the server can help prevent problems, or

make troubleshooting easier if problems do occur.

• Use uniform naming conventions for the servers, such as names that denote

server location. Uniform naming conventions help when trying to remember

often overlooked details that can hold the key to resolving a crisis.

• Use unique IDs or names for the devices. You can reduce the risk of components

competing for the same resource if you have a list. Use the server setup utility to

check for conflicts.

• Make a habit of using the HP tools, resources, software, and third-party product

resources to keep abreast of potential problems. You may be able to avoid

problems by noting the problems of others.

• Have a reliable backup plan. Schedule backups based on the server needs. If data

is changed frequently, frequent backups are required. Maintain a library of

backups based on your information-restoring needs. Test the backups

periodically to be sure that the data is correctly stored.

• Have a plan of action before the server fails, planning for failures of different

hardware parts.

• Check hard disk space periodically. It is recommended that hard drives have a

minimum of 15 percent free space.

• Scan for viruses weekly. Use the latest virus-scanning utilities available to be

sure that the data is not corrupted.

• Keep historical data. You cannot know that the CPU utilization has increased

50 percent if you do not know what it was initially. If you have problems, you

can use the data to compare before and after scenarios. For example, you might

want to know about the user, bus, and power utilization rates.

• Keep a trend analysis so that you will know what to expect during certain points

in time. For example, if the CPU utilization rate always increases by 50 percent

during certain hours, you will know that increase is normal for the server you are

tracking.

Error Prevention Guide 7

HP CONFIDENTIAL

Writer: Ted Weiman File Name: 335894-1.doc

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• Create a problem resolution notebook. When problems do occur, keep a log of

the actions you took to resolve them. This could help you solve the same problem

more quickly in the future. System configuration, Survey Utility, and Array

Diagnostic Utility (ADU) printouts, as well as utility diskettes, can also be stored

with the resolution notebook. This information can save a great deal of time in

the future and ensure accuracy, especially when dealing with future part

replacement.

• Keep an up-to-date network topology map in an accessible location. This will

help in troubleshooting networking problems.

• If you have a tape drive, maintain a scheduled cleaning program.

• If you have a tape drive, remember the importance of tape cartridge label

placement. Place the label on the exposed surface of the cartridge so that it

cannot fall off or get lodged inside the tape drive.

• Consider keeping certain spare parts available onsite. Spare parts to maintain (if

applicable to the server) include SCSI controllers, hot-pluggable redundant

power supplies, hot-pluggable fans, hot-pluggable drives, SCSI cables, network

adapters, Processor Power Modules (PPMs), and perhaps even complete I/O,

media, processor, and memory modules, if the server is modular.

• Restock spare parts as they are used.

• Do not clean card edge connectors with erasers; it removes the gold, causes static

discharge, and leaves residue. If connectors have to be cleaned, use isopropyl

alcohol or a special cleaning solution applied with a cotton-tipped swab.

Visually Checking the Server

Periodically, you should look at the following items on the server. A visual check can

prevent many problems.

• Be sure that systems and racks are not positioned tightly up against walls and that

adequate space exists around them for proper airflow.

• Move magnetized office items such as magnetized screwdrivers and telephones

with electromagnetic ringers away from the system.

8Error Prevention Guide

HP CONFIDENTIAL

Writer: Ted Weiman File Name: 335894-1.doc

Codename: Part Number: 335894-001 Last Saved On: 7/28/03 8:48 AM

• Be sure the server does not share a power line with high-current machines, such

as laser printers, air conditioners, copiers, and coffee machines, or ungrounded

power strips.

• Periodically check AC grounded (earthed) outlets to see if they are in need of

repair.

• Take the system cover off, and then remove any dust buildup with a can of

compressed air, tighten any loose connections, reseat boards, and inspect any

cables for frays. Move the cables away from sources of heat and give them more

slack if possible.

CAUTION: To avoid potential problems, always read the cautionary information

in the server documentation before removing, replacing, reseating, or modifying

system components.

• Check for adequate airflow and dislodge anything blocking the fans.

• Check for dust on external server parts, such as fans.

• Check the server after power disruptions due to acts of nature. Refer to the

“Recognizing Power Problems Caused by Acts of Nature” section in this guide.

Recognizing Power Problems Caused by

Acts of Nature

Some power problems are caused by acts of nature, which can range from lightning

and excessive heat to ice, rain, and windstorms. Lightning can cause spikes and

surges (a spike is a quick impulse of undesirable high voltage on a power line,

typically lasting only a fraction of a second, whereas a surge is a sudden increase in

line voltage of short duration). Excessive heat from increased use of air conditioners

can overload utility grids, causing erratic voltages, brownouts, or power outages

(brownouts are voltage reductions by a utility company to counter excessive demand

on its generation and distribution system). Storms can cause total blackout conditions

due to downed power lines.

Error Prevention Guide 9

HP CONFIDENTIAL

Writer: Ted Weiman File Name: 335894-1.doc

Codename: Part Number: 335894-001 Last Saved On: 7/28/03 8:48 AM

10 Error Prevention Guide

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Power disruptions take many forms, including power surges and sags, high-voltage

spikes, switching transients, brownouts, and complete power failure. When a power

disruption occurs, check the server for signs of data damage, data loss, file

corruption, and hardware damage. The difficulty of dealing with power fluctuations

is that the damage is not always immediately noticeable; thus, problems may not be

noticed until long after the power disruption has occurred. Power management

hardware like an uninterruptible power supply (UPS) minimizes the effect of power

fluctuations and disruptions and is highly recommended.

Preventing Power Management Problems

When determining the power requirements for the server, consider the factors in this

section.

General Power Requirements

Be sure that you are following the power requirements described in the server

documentation. Also, the installation of the system equipment must be in accordance

with local/regional electrical regulations governing the installation of information

technology equipment by licensed electricians.

For electrical power ratings on options, refer to the rating label on the product or user

documentation supplied with that option.

Power Consumption Considerations

Before configuring the server, you must evaluate power consumption requirements

and determine the appropriate number of power supplies to be sure that the server has

sufficient power capacity. In addition to determining the minimum power supply

requirements, you must also consider whether AC power redundancy is a

requirement, if applicable to the server. For more information on the specific power

capabilities of the server, refer to the server documentation. To obtain the most

accurate power capacity and assessment of power margin, use the power calculator

provided on the ActiveAnswers website at

http://activeanswers.compaq.com/aaconfigurator

Power Supply Considerations

After you determine the appropriate amount of power for the server, install the power

supplies needed for the level of redundancy you require.

Power Redundancy Considerations

If available for the server, power redundancy protects the server from power failures

caused by:

• Power failure in one of the two AC circuits providing power to the server

• Accidentally unplugging one of the power cords providing power to the server

• Failure of one power supply

IMPORTANT: The power redundancy described in this section is not the same as protection

provided by a UPS. In the event of a catastrophic power failure affecting each power cord

providing power to the server, the server loses power and shuts down. To provide complete

power protection, HP recommends installing a suitable UPS.

Refer to the server documentation to determine what power redundancy requirements

are necessary for the server.

Preventing Damage to Removable Drives

Removable drives are fragile components that must be handled with care. To prevent

damage to the computer, damage to a removable drive, or loss of information,

observe these precautions:

• Before removing a diskette drive, CD-ROM drive, or DVD drive, be sure that a

diskette or disc is not in the drive. Be sure that the CD-ROM or DVD tray is

closed.

• Before handling a drive, be sure that you are discharged of static electricity.

While handling a drive, avoid touching the connector.

• Handle drives on a work surface that has at least one inch of shockproof foam.

• Do not drop drives from any height onto any surface.

Error Prevention Guide 11

HP CONFIDENTIAL

Writer: Ted Weiman File Name: 335894-1.doc

Codename: Part Number: 335894-001 Last Saved On: 7/28/03 8:48 AM

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