HP 124708-001 - ProLiant Cluster - 1850 Manuale utente

System Memory Troubleshooting Best Practices for HP

ProLiant Servers

Accurately troubleshooting system memory issues in ProLiant server configurations is an important process that

can help prevent unnecessary replacement of hardware components. In addition, accurate problem diagnosis

prevents customers from experiencing unnecessary downtime while waiting for hardware that may not need

to be replaced. Following standard troubleshooting guidelines and using them each time a memory issue is

suspected helps to establish this.

HP has developed several methods for troubleshooting memory problems in ProLiant servers.

The purpose of this white paper is to assist HP customers in troubleshooting system memory problems by

successfully isolating the specific DIMMs causing the problem. This helps to prevent nonessential replacement

of unaffected DIMMs or, in some cases, entire banks of memory. In addition, effective troubleshooting can

help determine if a firmware or other software download can resolve a problem without replacing hardware.

This white paper covers the following topics:

•Why should I troubleshoot every system memory problem?

•How can I tell if a memory problem has occurred?

•What tools are available from HP to help identify a failing DIMM?

•Troubleshooting using HP Insight Diagnostics Online Edition

•Troubleshooting using HP Insight Diagnostics Offline Edition

•Troubleshooting flowchart for bootable systems

•Troubleshooting flowchart for non-bootable systems

•What role does firmware play in solving system memory problems?

•Why Buy HP Memory?

•Other troubleshooting resources

Why Should I Troubleshoot Every Memory Problem?

Accurate diagnosis of system memory problems in ProLiant servers has many advantages, including:

•Prevents unnecessary hardware replacement.

•Prevents the return of parts that test NFF (No Fault Found).

•Prevents server downtime.

Best Practice

: Many product issues that result in hardware replacement are preventable or

correctable with a firmware update. HP strongly recommends checking for a firmware update before

sending a part back to HP for replacement. Based on the HP ProLiant product return rates, a

significant percentage of all returned hardware products were functioning properly and only needed

a firmware update. Although not all products fall into this category, server downtime and time spent

removing, returning, and ultimately replacing hardware may have been avoided if an attempt had

been made to flash the firmware during the troubleshooting process.

How can I tell if a Memory Problem has Occurred?

There are many indicators that a problem has occurred within the memory subsystem. HP has several tools

used to identify the status of hardware and software within a system. Using these tools is a good first step in

the troubleshooting process. When a system memory problem is suspected, check one or all of these

common places to find information:

•HP System Management Homepage (SMH)

•HP Systems Insight Manager (HP SIM)

•Server Logs

•DIMM Slot LEDs

IMPORTANT:

When a memory error is detected, the firmware illuminates the fault LEDs located near each DIMM

slot on the system board.

If the system identifies an error to a specific slot, that LED illuminates. However, if the system can only

identify an error within a bank, but cannot isolate a specific DIMM, all the LEDs in the bank will

illuminate.

In addition, if the system cannot identify the bank in which the error has occurred, all the LEDs in all

banks illuminate, making the task of isolating the failing DIMM more difficult and the chance of

replacing functioning banks of memory more likely.

Therefore, further troubleshooting is necessary to determine which specific DIMM is failing. Use the

LEDs as a tool in identifying that a memory problem may exist, but do not rely solely on the status of

the LEDs to determine if hardware should be replaced.

What Tools are Available from HP to Help Identify a Failing DIMM?

Refer to the any of following HP system tools whenever a memory problem is suspected.

HP System Management Homepage

The HP System Management Homepage supplies a consolidated view of system hardware health,

configuration, performance and status information for individual HP servers. Details are provided on total

system health, including system memory. Information on system memory can be found under the

“Performance” section on the main page (See Figure 1). For Linux and Windows, HP SMH is available in the

ProLiant Support Pack and Integrity Support Pack. To download the latest version of the ProLiant Support Pack

or Integrity Support Pack, navigate to the Support and Troubleshooting link on http://www.hp.com.

Figure 1: Overview of the HP System Management Homepage

HP Systems Insight Manager (HP SIM)

HP Systems Insight Manager monitors the health of the hardware in the system and polls installed hardware

for its status every few minutes. Refer to Figure 2 below for an example of events displayed on the System

page. For more information on HP SIM, refer to the following URL:

http://h18013.www1.hp.com/products/servers/management/hpsim/index.html

Figure 2: HP Systems Insight Manager

System Logs

erver system logs record the status of hardware events, including memory issues. For servers running

•Integrated Management Log (IML)

r servers running Linux operating systems, refer to either of the following:

•Integrated Management Log (IML)

icrosoft Windows Operating Systems: Using the IML

e IML Viewer is a software tool created by HP and is available as a downloadable component pack from

Figure 3: Integrated Management Log

Microsoft Windows operating systems, either of the following logs can be a valuable resource:

•Event Viewer

•varlog/messages file

HP.COM. It can also be accessed via the HP System Management Homepage (SMH). Navigate to this tool

through SMH by clicking on the Logs tab or through the operating system from HP System Tools. Figure 3

below shows the Integrated Management Log accessed via SMH. System memory issues, if present, will b

recorded and will be visible in the IML.

Microsoft Windows Operating Systems: Using Event Viewer

e Event Viewer is a software tool available as part of Microsoft Windows operating systems. It can be

Figure 4: Event Viewer (Microsoft Windows Operating Systems)

nux Operating Systems: Using the IML

e IML Viewer is a software tool created by HP and is available as a downloadable component pack from

accessed by navigating to HP System Tools via the Start menu. Figure 4 shows an example of server even

that are logged in this tool.

HP.COM. For systems running Linux, type the command hplog –v to view the IML log and check for system

memory errors. From the Linux Command Prompt, type “hplog –v” and the entire IML will be displayed. Any

detected system memory error will be logged, including any pre-failure warranty memory events on systems

where applicable.

Linux Operating Systems: Using /var/log/messages File

The Linux system log (/var/log/messages) can be viewed using the cat, more and less commands. The

following types of messages may be logged here if a memory problem has occurred:

Oct 11 01:51:18 dhcp57-150 hpasmd[12039]: WARNING: hpasmd: Corrected Memory Error threshold

exceeded (Slot 3, Memory Module 6)

[root@dhcp57-150 ~]# hplog -v

ID Severity Initial Time Update Time Count

-------------------------------------------------------------

0011 Information 22:50 09/16/2004 22:50 09/16/2004 0001

LOG: IML Cleared (Administrator)

0012 Repaired 00:32 09/21/2004 00:32 09/21/2004 0001

LOG: Memory Cartridge Not Redundant (Slot 5)

0033 Caution 04:02 10/06/2006 04:02 10/06/2006 0001

LOG: Corrected Memory Error threshold exceeded (Slot 3, Memory Module 6)

DIMM Slot LEDs as Memory Problem Indicators

DIMM slot LEDs can be helpful indicators of issues with system memory. Figure 5 below gives an example of

the location of LEDs that will illuminate when certain DIMM slots indicate a failure. The example below is from

a ProLiant DL380 G4 system board; however, similar graphics for specific systems can be found in server

user guides and other system documentation.

9/5/2006 12

Memory Problem Indicators

Amber = Memory

failed

Off = Normal

DIMM failure

slot 1A

Amber = Memory

failed

Off = Normal

DIMM failure

slot 2A

Amber = Memory

failed

Off = Normal

DIMM failure

slot 3B

Amber = Memory

failed

Off = Normal

DIMM failure

slot 4B

Amber = Memory

failed

Off = Normal

DIMM failure

slot 5C

Amber = Memory

failed

Off = Normal

DIMM failure

slot 6C

Example DL 380 G4

DIMM Slot LEDs on the System Board

Figure 5: DiMM Slot LEDs

Once a system memory problem is suspected based on one of the methods outlined above, the first step is to

schedule downtime for troubleshooting. HP recommends using HP Insight Diagnostics, available on the HP

SmartStart CD, to begin the troubleshooting process.

HP Insight Diagnostics is a proactive server management tool that is available in offline and online editions. It

provides diagnostics and troubleshooting capabilities to help locate system and component problems.

Features of HP Insight Diagnostics:

•Works on multiple operating systems

•Can be used offline or online

•HP Insight Management Agents and the System Management driver can be leveraged

•Common Diagnostic Model (CDM) compliance.

For more information on HP Insight Diagnostics, refer to the following URL:

http://h18013.www1.hp.com/products/servers/management/hpid/index.html

Troubleshooting Using HP Insight Diagnostics Online Edition

HP Insight Diagnostics Online edition is available in HP ProLiant Support Packs.

The Insight Diagnostics Online edition performs various non-intrusive in-depth system and component

diagnoses while the operating system is running. The “survey feature” can identify and resolve problems

without taking the system down.

Troubleshooting Using HP Insight Diagnostics Offline Edition

Insight Diagnostics Offline edition is available in HP SmartStart by choosing “Launch server diagnostics.”

Some benefits of HP Insight Diagnostics are:

•Performs extensive in-depth system and component testing while in a controlled operating

environment.

•Survey feature enables IT administrators to track hardware and software changes in order to form a

complete and thorough auditing process for the system.

•Test results can be analyzed by IT administrators to diagnose system and component problems in

order to repair and return servers back to the production environment.

Online Vs. Offline Testing

Offline is the preferred testing method because it is the most accurate. When testing offline, there is minimal

interference from the operating system and address space testing is maximized because a very small Linux

kernel is used.

Helpful Links:

HP Insight Diagnostics User Guide: www.hp.com/servers/diags

Troubleshooting Flowcharts

The following troubleshooting flowcharts can be used as another tool for diagnosing specific DIMMs that

have failed. They can be used as a general guideline and should be used in conjunction with the other tools

and methods outlined in this white paper. Because a lot of system issues can be solved by upgrading

firmware, download the latest version of the firmware before proceeding with the troubleshooting methods

outlined in the following flowcharts. The latest firmware is available at the following URL:

http://h18023.www1.hp.com/support/files/server/us/romtabl.html

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