Apple xserve early2009 Service Manual
Apple Technician Guide
Xserve (Early 2009)
Updated: 2010-06-28
Apple Inc.
© 2009 Apple Inc. All rights reserved.
Under the copyright laws, this document may not be copied, in whole or in part, without the
written consent of Apple.
Every eort has been made to ensure that the information in this document is accurate. Apple
is not responsible for printing or clerical errors.
Apple
1 Innite Loop
Cupertino, CA 95014-2084
USA
+ 1 408 996 1010
www.apple.com
Apple, the Apple logo, Mac, and Macintosh are trademarks of Apple Inc., registered in the U.S.
and other countries.
Xserve (Early 2009)
Contents
Basics
Overview 9
Front View 10
Rear View 10
Serial Number Location 11
Hot-Pluggable SATA or SAS Drives 12
How to Identify Single- and Dual-Processor Congurations 13
Troubleshooting
General Troubleshooting 15
Update System Software 15
Emerging Issues 15
Hardware vs. Software 15
Xserve Firmware Updates 16
Memory Conguration 16
Block Diagram 21
Diagnostic LEDs 22
Symptom Charts 31
Startup and Power Issues 31
No Power / Dead Unit 31
Burnt Smell or Odor 34
Won’t Start Up / No Video/ LED On 36
Won’t Start Up / No Video/ Activity LEDs Flashing 38
Intermittent Shutdown 39
Kernel Panic/System Crashes 41
Uncategorized Symptom 43
Mass Storage 44
Apple Drive Module Read/Write Issue 44
RAID Battery Not Charging 58
Uncategorized Symptom 60
Input/Output Devices 61
Rear USB Port Does Not Recognize Known Devices 61
Front USB Port Does Not Recognize Known Devices 62
FireWire Port Does Not Recognize Known Devices 63
PCI-E Expansion Card/Slot Not Recognized 64
Communications 67
Ethernet Port/Device Issues 67
Video 70
Video Distortion 70
No Video 71
Mechanical Issues: Thermal and Enclosure 72
Failed or Fast Fans 72
Take Apart
General Information 76
Orientation 76
Tools 76
How to Identify Single- and Dual-Processor Congurations 76
Mounting in a Rack 76
Icon Legend 77
Note on Illustrations 77
Apple Drive Module 78
Removal 79
Replacement 80
Power Supply 81
Removal 82
Replacement 82
Power Supply Blank 83
Removal 84
Replacement 84
Top Cover 85
Removal 86
Replace 86
Solid State Drive 87
Removal 88
Replacement 88
Solid State Drive Cable 89
Removal 90
Replacement 90
Solid State Drive Carrier 91
Removal 92
Replacement 92
Memory 94
Removal 95
Memory Slot Utility 95
Replacement 96
Memory Conguration 96
PCI-E Riser Cards 97
Removal 98
Replacement 98
PCI-E Expansion Cards 99
Removal 100
Replacement 101
Optical Drive 102
Removal 103
Replacement 104
Airow Duct 105
Removal 106
Replacement 107
Fan Array 108
Removal 109
Replacement 109
Battery 110
Removal 111
Replacement 111
Front Panel Cable 112
Removal 113
Replacement 113
Backplane-to-Logic Board I/O Cable 114
Removal 115
Replacement 115
Optical Drive Cable 117
Removal 118
Replacement 119
Locking Mechanism Rod 120
Removal 121
Replacement 121
Front Bezel Brackets 122
Removal 123
Replacement 123
Front Bezel Assembly 124
Removal 125
Replacement 126
Front Panel Buttons 127
Removal 128
Replacement 128
Light Pipe 129
Removal 130
Replacement 130
Front Panel Board 131
Removal 132
Replacement 132
Drive Interconnect Backplane 133
Removal 134
Replacement 134
Xserve RAID Card 136
Removal 137
Replacement 138
Power Distribution Board 139
Removal 140
Replacement 140
Power Distribution Board Cable 141
Removal 142
Replacement 142
Xserve RAID Card Battery 143
Removal 144
Replacement 144
Processor Heat Sink 145
Removal 146
Replacement 148
Processor 149
Removal 150
Replacement 151
Video Mezzanine Card 153
Removal 154
Replacement 154
Logic Board 155
Removal 156
Replacement 158
Rear ID Button 159
Removal 160
Replacement 160
ID Tab 161
Removal 162
Replacement 162
Enclosure 163
Removal 164
Replacement 164
Views
Exploded View 166
Feedback 168
Apple Technician Guide
Basics
Xserve (Early 2009)
© 2009 Apple Inc. All rights reserved.
Overview
2010-06-28
The Xserve (Early 2009) rack-optimized server features single or dual Quad-Core Intel Xeon
“Nehalem” processors, integrated memory controllers featuring up to 12 DIMMs of 1066MHz
DDR3 ECC RAM, three hot-plug drive bays supporting SATA or SAS Apple Drive Modules,
support for a Solid-State Drive (SSD) boot drive, dual x16 PCI Express 2.0 slots, NVIDIA GeForce
GT 120 graphics subsystem and integrated lights-out management.
Identifying Features
The main features and service dierences include:
• single and dual Intel Xeon “Nehalem” processors
• 6 or 12 DIMM slots depending on processor conguration
• Solid-State Drive Support
• Mini DisplayPort connector on rear panel
Xserve (Early 2009) Basics — Overview 9
Front View
On/standby button
Drive module
status light
Rear View
Serial console
and light
port
Enclosure lock
and status light
Drive module
activity light
Mini DisplayPort
USB 2.0
Expansion
slot 2
port
System identifier
button/light
Ethernet link light
Ethernet
port 2
(Port 1)
Ethernet
port 1
Ethernet link light
(Port 2)
System activity
lights
Expansion
slot 1
Optical drive
Drive module
bays (3)
USB 2.0 ports (2)
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System identifier
button/light
System information tag
(pullout tab)
FireWire 800
ports (2)
Power supply
bay 1
Power supply
bay 2
Xserve (Early 2009) Basics — Overview 10
Serial Number Location
The serial number is located at the rear of the unit: on the ID Tab.
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Xserve (Early 2009) Basics — Overview 11
Hot-Pluggable SATA or SAS Drives
The server includes three hard drive bays at the front of the Xserve. All bays support Apple
qualied hot-pluggable Apple Serial ATA (SATA) or Serial Attached SCSI (SAS) drive modules.
Xserve drive bays support qualied Apple Drive Modules with Apple qualied hard drives
and rmware only. Drive bays not congured with an Apple Drive Module ship with a nonfunctional blank drive carrier which do not support third-party hard drive installation.
Drive bays are numbered 1-3, beginning with the far left bay. The drive installed in bay 1 is the
boot drive and should have the operating system installed on it. Xserve’s congured with a
Solid-State Drive (SSD) will contain the Mac OS X Server operating system and function as the
boot drive.
You can replace or install hard drives while the Xserve is running; you do not need to
shutdown or open the Xserve rst, but you may need to dismount the drive from the Xserve
OS beforehand. A status light on the front of each drive indicates when it is safe to remove the
drive without losing data. For more information, see “Apple Drive Module” in the Take Apart
chapter.
Solid-State Drive
The server may include an optional Solid-State Drive. The drive contains the Mac OS X Server
operating system as the boot drive for the Xserve.
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Xserve (Early 2009) Basics — Overview 12
Power Supply Redundancy
The Xserve (Early 2009) supports up to two power supply modules for redundancy. There are
two power supply bays in the rear of the enclosure. You can replace or install a power supply
from the back panel without removing the Xserve from the rack. If the Xserve has two power
supplies, they are hot-swappable; the Xserve will continue to operate using only one supply
while the second is removed. For more information about removing or installing power supply
modules, see “Power Supply” in the Take Apart chapter.
How to Identify Single- and Dual-Processor Congurations
To identify the conguration of an Xserve (Early 2009) computer, check the code on the
computer’s ID Tab, which is located on the computer’s back panel. See “Serial Number
Location.”
There are three options for identifying single and dual processor congurations:
• Quad-Core Xserve (Early 2009): Single processor logic board with 6DIMM slots, and one
large heat sink
• 8-Core Xserve (Early 2009): Dual processor logic board with 12 DIMM slots, and two large
heat sinks:
• Quad-Core Xserve (Early 2009): Single processor logic board, 12 DIMM slots and one large
heat sink. This option is present only when a single-processor logic board has previously
been replaced via the Xserve service parts kit.
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Xserve (Early 2009) Basics — Overview 13
Apple Technician Guide
Troubleshooting
Xserve (Early 2009)
© 2009 Apple Inc. All rights reserved.
General Troubleshooting
Update System Software
Important: Whenever possible before beginning troubleshooting, ensure the latest software
and rmware updates have been applied.
Troubleshooting Theory
For general information on troubleshooting theory, refer to:
http://service.info.apple.com/service_training/en/006/troubleshoot/index.php?page=intro
Emerging Issues
For the latest on troubleshooting issues, refer to:
http://support.apple.com/kb/index?page=search&q=khot%20Xserve%20Emerging%20
Issue
Hardware vs. Software
For information on how to isolate a hardware issue from a software issue, refer to:
http://support.apple.com/kb/TS1388
TS1394—Mac OS X: Troubleshooting installation and software updates <http://support.apple.
com/kb/TS1394>
HT2956—Troubleshooting Mac OS X installation from CD or DVD <http://support.apple.com/
kb/HT2956>
For information on how to troubleshoot a software issue, refer to:
HT1199—Mac OS X: How to troubleshoot a software issue <http://support.apple.com/kb/
HT1199>
HT1219—Xserve, Xserve RAID: Apple Drive Module (ADM) compatibility <http://support.apple.
com/kb/HT1219>
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Xserve (Early 2009) General Troubleshooting — Update System Software 15
Xserve Firmware Updates
Firmware is the name given to software that is written into memory circuits, such as ash
memory, that will hold the software code indenitely, even when power is removed from the
hardware. Firmware on Intel Mac computers is designed to be updated if necessary through a
software update.
EFI and SMC rmware is stored on the Xserve (Early 2009) backplane board. EFI rmware
updates update the Boot ROM, and SMC updates update the System Management Controller
rmware. The SMC manages fans and other environmental parameters that are independent of
the Boot ROM.
Firmware symptoms can be easily mistaken for hardware issues (e.g., overheating issues, fan
noise issues, etc.). Always check both EFI and SMC rmware versions and update if necessary
before replacing any hardware components.
The following lists describe the type of symptoms that may be resolved by updating the EFI
and SMC rmware.
Symptoms that may be resolved by updating EFI rmware:
• Cannot eject media (various conditions)
• No video on start up
• Not waking or sleeping when expected
• Bad media taking too long to eject (including holding mouse button down at startup taking
minutes to eject)
Symptoms that may be resolved by updating SMC rmware:
• Fan related behavior (excessive speed or noise)
• Loud audible clicking from some fans
• Thermal shut down or warnings
• Diagnostics reporting failures
• Sleep/wake issues
• Intermittent shut down
• SMC causes bad/missing ambient sensor to cause the computer to go to sleep
• Hangs, black screen on restart from Windows
Please follow the steps outlined in KnowledgeBase article HT2013, “About Firmware Updates
for Xserve,” to perform an EFI and/or SMC rmware update. Information about rmware
versions for Intel Macs can be found in KnowledgeBase article HT1237, “Mac OS X: Firmware
Updates for Intel-based Macs.”
Memory Conguration
Xserve (Early 2009) comes with a minimum of 3 GB of 1066MHz DDR3 ECC memory, installed as
three 1 GB unbuered dual inline memory modules (UDIMMs).
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Xserve (Early 2009) General Troubleshooting — Xserve Firmware Updates 16
DIMMs must t these specications:
• PC3-8500,1066 MHz, DDR3 SDRAM UDIMMs
• 72-bit wide, 240-pin modules
• 36 memory ICs maximum per UDIMM
• Error-correcting code (ECC)
For proper operation of Xserve (Early 2009) computers, Apple recommends using only Appleapproved DIMMs. Refer to GSX for Apple DIMM service part numbers. Memory from older
Xserve computers is not compatible with Xserve (Early 2009).
Single Processor
Single-processor (quad-core) computers have six memory slots. You can install 1 GB, 2 GB or
4GB DIMMs for a total of up to 24 GB of memory.
You can install dierent size DIMMs in Xserve (Early 2009). However, for best performance,
Apple recommends you install equal-size DIMMs (all 1, 2 or 4GB) lling the slots in the order
listed in this table.
If you have Fill these slots
Three DIMMs A1, A2, and A3
Four DIMMs A1, A2, A3, and A4
Five DIMMs A1, A2, A3, A4, and A5
Six DIMMs A1, A2, A3, A4, A5, and A6
See also “Memory Slot Utility” below.
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Xserve (Early 2009) General Troubleshooting — Memory Conguration 17
Dual Processor
Dual-processor (eight-core) computers have twelve memory slots. You can install 1 GB, 2 GB, or
4 GB DIMMs for a total of up to 48 GB of memory.
You can install dierent size DIMMs. in Xserve (Early 2009) However, for best performance, Apple
recommends you install equal-size DIMMs (all 1, 2, or 4 GB) lling the slots in the order listed in
this table.
If you have Fill in these slots
Three DIMMs A1, A2, and A3
Four DIMMs A1, A2, and B1, B2
Five DIMMs A1, A2, A3 and B1, B2
Six DIMMs A1, A2, A3 and B1, B2, B3
Seven DIMMs A1, A2, A3, A4 and B1, B2, B3
Eight DIMMs A1, A2, A3, A4 and B1, B2, B3, B4
Nine DIMMs A1, A2, A3, A4, A5 and B1, B2, B3, B4
Ten DIMMs A1, A2, A3, A4, A5, A6 and B1, B2, B3, B4
Eleven DIMMs A1, A2, A3, A4, A5, A6 and B1, B2, B3, B4, B5
Twelve DIMMs A1, A2, A3, A4, A5, A6 and B1, B2, B3, B4, B5, B6
See also “Memory Slot Utility” below.
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Xserve (Early 2009) General Troubleshooting — Memory Conguration 18
Memory Slot Utility
If you install dierent size DIMMs in single-processor or dual-processor computers, follow the
order in the tables above. If the DIMM conguration you install doesn’t provide optimized
performance, the Memory Slot Utility will appear on screen and recommend an improved
conguration. To use the Memory Slot Utility again, go to /System/Library/Core Services.
Example of Memory Slot Utility Screen for Single-Processor Computer
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Xserve (Early 2009) General Troubleshooting — Memory Conguration 19
Example of Memory Slot Utility Screen for Dual-Processor Computer
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Xserve (Early 2009) General Troubleshooting — Memory Conguration 20
Block Diagram
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Xserve (Early 2009) General Troubleshooting — Block Diagram 21
Diagnostic LEDs
Logic Board Diagnostic LEDs
The Xserve (Early 2009) logic board includes a set of LEDs to help service providers
troubleshoot the computer. The LEDs are located on the logic board below the DIMM
connectors, at the rear of the unit, to the left side of the unit (looking from the back), and on
the Drive Interconnect Backplane or Xserve RAID Card.
Some tips:
• You must remove the unit from its rack and place it on a sold surface with its cover removed
in order to view these LEDs. Most internal diagnostic LEDs are only enabled to come on when
the cover is removed (memory DIMM LEDs remain ON even with the cover in place).
• Do not attempt to troubleshoot the unit solely by these LEDs alone. Use this information to
guide your troubleshooting, not lead it.
If a specic error condition exists, there should be corresponding LED evidence to help verify
and isolate the issue. However, it is not possible to deduce a fault or isolate a specic symptom
solely by examining these LEDs out of context.
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Xserve (Early 2009) General Troubleshooting — Diagnostic LEDs 22
1. System State LEDs
Use the following table to interpret the LEDs.
Location Name Color Nominal Indicates
S0 Power ON Green On; o when
in standby
mode
S3 Sleep Green O, on when
Xserve is in
sleep mode
S5 Standby Green O; on when
Xserve is in
standby
System is
running
System is in
sleep mode
Standby
mode,
illuminates
when AC
power is
attached
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Xserve (Early 2009) General Troubleshooting — Diagnostic LEDs 23
2. CPU Error LEDs
Use the following table to interpret the LEDs.
Location Color Nominal Indicates
CPU_PWRGD Green O; on to indicate
hardware power has
passed
RSM_RST Yellow, Red O Fault preventing CPU from
SYS_PWRGD Green On at power-on to
indicate power has
passed
PLT_RST Red O; on Yellow at
power on
CPU B OVERTEMP Red O; on if CPU B core
exceeds normal
temperature
IOH OVERTEMP Red O; on if IOH exceeds
normal temperature
CPU A OVERTEMP Red O; on if CPU A core
exceeds normal
temperature
Power chain in hardware
executing instructions
Power chain in hardware
Platform reset
Temperature of CPU B core
status
Temperature of IOH status
Temperature of CPU A core
status
MXM OVERTEMP Red O; on if MXM video
card exceeds normal
temperature
Temperature of MXM video
card status
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Xserve (Early 2009) General Troubleshooting — Diagnostic LEDs 24
Platform Reset
Normally remains on during standby. This LED ashes on (yellow) briey at power-on. LED
should turn o as system powers up and begins to execute instructions.
Overtemp LEDs
Normally o. These LEDs come on if an error occurs.
If LED is solidly on, it may indicate a processor over-temperature condition. Initial processor
over-temperature can cause symptoms such as sluggish computer performance. Chronic
processor over-temperature can cause the computer to hang completely.
Troubleshooting:
• Verify proper heatsink installation.
• Verify all fans are operating properly, especially the fan array.
• If both overtemp LEDs come on immediately when the computer is turned on, a faulty
power supply could be one cause of this behavior. Replace power supply.
• Try swapping CPU A and CPU B locations. If the CPU Error LED follows the CPU, replace that
CPU.
3. EFI POST (Power On Self Test) LEDs
This group of eight LEDs are arranged into two sets of four LEDs, representing a binary code
that only has any signicance during the short time between power-on and the unit begins to
boot the OS, while the CPU is executing EFI code only. At no other time should these LEDs be
used or interpreted to mean anything meaningful.
The code is more easily described as two Hexadecimal digits ranging from $00 to $FF, to make
it easier to list and compare during troubleshooting. Each ONE represents an LED that is ON,
and each ZERO represents an LED that is OFF
Normal power-up LED sequence:
• The sequence of codes below is typical in the rst few seconds of a functioning unit’s boot
cycle, immediately following power-on, during the EFI phase of startup.
• If your system is not booting you should check these LEDs closely to verify the sequence of
codes has been executed in addition to your normal troubleshooting steps. Each code will only
remain ON GREEN for a split-second each. The entire sequence takes only a few seconds to
progress through.
• To see this sequence, power-on the unit (use the remote power on/o button on the logic
board) while holding down the option key on an attached USB keyboard, to invoke the EFI
startup manager and prevent the unit from leaving EFI and booting into any OS. Do this as you
watch these LEDs as they progress through the following sequence:
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Begin (power-on)
Xserve (Early 2009) General Troubleshooting — Diagnostic LEDs 25
$Bx = 1 0 1 1 X X X X = All $Bx codes below are memory init codes (x may be any code 0 - F)
$BF = 1 0 0 1 1 1 1 1 = If the unit does not progress past any $Bx memory init codes, this could
indicate a memory issue regardless of whether DIMM diagnostic error LEDs are ON or not.
$12 = 0 0 0 1 0 0 1 0 = After memory initialization has successfully completed
$51 = 0 1 0 1 0 0 0 1 = Video driver enabled beyond this point. Attached display should be
displaying an image now. If not, this may indicate a graphics card issue.
$F9 = 1 1 1 1 1 0 0 1 = EFI nished and passed on control to OS boot loader
4. CPU Voltage LEDs
This group of LEDs will normally FLASH RED briey during power-on, then should normally
remain ON solidly GREEN when all voltage regulators are functioning properly to provide
voltages to CPU A and CPU B, as well as IOH.
If any of these LEDs remain ON RED, this indicates that the corresponding voltage regulator is
enabled but not providing any voltage output.
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In single processor units the LED group for the second processor are not present.
Xserve (Early 2009) General Troubleshooting — Diagnostic LEDs 26
5 & 6. Memory Diagnostic LEDs (A1 - A6 and B1 - B6)
This group of LEDs will normally remain OFF during power-on and throughout normal
operation. If any of these LEDs come ON RED, this indicates that the corresponding DIMM (or
its slot) may be faulty. To verify whether the fault lies with the DIMM or the slot, power down
the unit and move the DIMM to another slot. If the DIMM is faulty, the LED adjacent to its new
slot should come ON RED when power is reapplied. If a known-good DIMM is installed in the
suspect slot and the LED adjacent to this slot should come ON RED , this may indicate a faulty
DIMM slot on the logic board.
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How to Troubleshoot Memory LEDs
1. Remove and reseat DIMM
2. Restart computer. If associated LED is no longer illuminated, issue is resolved
3. If associated LED remains illuminated, replace DIMM with new DIMM
4. Restart computer and verify LED is no longer illuminated
Xserve (Early 2009) General Troubleshooting — Diagnostic LEDs 27
7. Reset Buttons
System Management Controller (SMC) Reset
The System Management Controller (SMC) is a chip on the logic board that controls all power
functions for the Xserve. If the Xserve is experiencing any power issue, resetting the SMC may
resolve it. The SMC controls several functions, including:
• Telling the Xserve when to turn on, turn o, sleep, wake, idle, and so forth
• Handling system resets from various commands
• Controlling the fans
It is also recommended that the SMC be reset on any new logic board after it is installed as part
of a repair.
Note that resetting the SMC does not reset the PRAM. Resetting the SMC will not resolve issues
in which the Xserve is unresponsive—in these situations, restarting the Xserve will generally
suce.
If the Xserve isn’t responding, perform these steps one at a time, in the following order, until
the issue has been resolved:
1. Force Quit (Option-Command-Escape)
2. Restart (Control-Command-Power)
3. Force Shut Down (press the power button for 10 seconds)
4. Remove the Xserve from the rack (if applicable)
5. Remove the Top Case
6. Press the SMC Reset button on the logic board
Resetting the SMC can resolve some Xserve issues such as not starting up, not displaying video,
sleep issues, fan noise issues, and so forth. If the Xserve still exhibits these types of issues after
you’ve restarted the Xserve, try resetting the SMC. There are two ways to reset the SMC on the
Xserve.
System Management Control (SMC) Reset in Rack
1. Shut Down the Xserve, either locally or using remote commands (or if the Xserve is not
responding, hold the power button until it turns o).
2. Unplug the AC power cord.
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3. Wait at least 15 seconds.
4. Plug the power cord back in, making sure the power button is not being pressed at the time.
Xserve (Early 2009) General Troubleshooting — Diagnostic LEDs 28
5. Press the power button to start up the Xserve.
Power ON / OFF Button
Behaves exactly like the front panel power button, and can be used as an alternate way to turn
the unit on and o if needed.
Reset Buttons
When pressed, resets CPUs regardless of what is currently running. This reset overrides all
software processes and restarts the system. Use with caution as this form of reset may corrupt
software or les on a drive.
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Drive Interconnect Backplane LEDs
Note: The following information describes the diagnostic LEDs present on the interconnect
backplane.
This group of eight LEDs are arranged into two sets of four LEDs, representing information
about the SATA / SAS communication between the drive controller channels on the drive
interconnect backplane and the drive modules themselves. The optional SSD drive does not
have a representative LED on this board.
There is also a ‘heartbeat’ LED on this board which starts ashing ON GREEN and OFF when EFI
loads immediately after power-on and continues to ash ON and OFF during normal operation.
The rst group of four LEDs indicates activity for the four I/O channels corresponding to the
three drive bays. Since there are only three drive bays, the fourth I/O channel and LED are not
used and should remain OFF during normal operation.
The second group of four LEDs indicates that the controller has recognized that a drive
module is present and connected. These LEDs are normally solidly ON GREEN when no drive
is present, and turn OFF when a drive module has been inserted into the corresponding drive
Xserve (Early 2009) General Troubleshooting — Diagnostic LEDs 29
bay and the controller has recognized this event. The LED will turn ON GREEN again when the
corresponding drive module has been removed from its bay.
Since there are only three drive bays, the fourth I/O channel and LED are not used and should
remain ON GREEN during normal operation.
When you power-on the system, you should see the following activity sequence on these LEDs:
1. The entire group of eight LEDs should come ON solid GREEN when power is applied and
remain on for a few seconds.
2. The heartbeat LED begins ashing when EFI loads in the rst few second after power-on.
The rst group of four activity LEDs should now turn OFF. The second group of four ‘drive
present’ LEDs should remain on for a few more seconds.
3. The second group of four ‘drive present’ LEDs should each turn OFF as the controller scans
and recognizes each connected drive module in turn, from bay 1 to bay 3 in order. The
fourth LED should remain ON since no drive is present on the fourth I/O channel.
4. Beyond this point, the only LEDs that should be ashing are among the rst group of four
drive activity LEDs, to indicate drive activity between a corresponding drive module, such
as the boot drive module booting the OS, and the drive controller.
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Xserve (Early 2009) General Troubleshooting — Diagnostic LEDs 30
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