Apple Xserve User Manual
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Xserve Take Apart - 69 Battery Procedure 1. Pry up the battery from its holder. Note: You may first need to spread the two tabs on the holder slightly apart to release the battery. 2. Remove the battery from the server. Note: When replacing the battery, make sure the positive (+) end of the battery aligns with the + symbol on the battery holder.
70 - Xserve Take Apart Logic Board Logic Board Tools No tools are required for this procedure. You may, however, Þnd a Phillips screwdriver useful in releasing the thumb screw in step 1 below. Preliminary Steps Before you begin, open the server and remove the following. ¥ DIMMs ¥ PCI cards ¥ processor ¥ ATA controller board ¥ power supply Note: The replacement logic board does not include the processor, memory DIMMs, or expansion cards. You must transfer these modules from the original board to the new one. Part Location
Xserve Take Apart - 71 Logic Board Procedure 1. Release the thumb screw that secures the logic board to the chassis. 2. Move the logic board forward and up slightly to release it from the four mounting pegs. 3. Tilt up the end of the logic board nearest the blowers so that the board ports clear the chassis. 4. Remove the board from the server. Replacement Note: Before installing the replacement logic board, check the heatsink thermal pad on the underside of the board. If the pad is covered with a protective Þlm, remove it. (The protective Þlm is a very thin layer on top of the thermal pad. Be careful to remove only the Þlm, not the pad.)
72 - Xserve Take Apart Logic Board Important: When replacing the logic board, make sure the boardÕs connectors Þt through the appropriate openings in the serverÕs back panel. Take special care to Þt the clear plastic system identiÞer button through its opening. (The system identiÞer button is located low on the back panel, to the left of center.) After installing a replacement logic board, be sure to transfer any PCI cards, risers, and DIMMs to the new board. You must also remove the battery insulator tab from the battery holder on the new board. Note: Replacing the logic board in the server changes its Ethernet ID number. The new number is printed on an Ethernet ID label packaged with the replacement logic board. After installing the new logic board, cover the Ethernet ID number on the serverÕs serial number with the new ID label.
© 2003 Apple Computer, Inc. All rights reserved. ð Service Source Troubleshooting Xserve
Xserve Troubleshooting - 1 General Information General Information WhatÕs New Rack-Mounted Server Xserve is designed to be mounted in a rack. Once the server is installed in the rack, you can slide it open from the front to exchange or add parts. For more information, see ÒOpening the ServerÓ in the Take Apart chapter. Server IdentiÞer Light/Button The identiÞer light on the serverÕs front panel turns on when internal sensors or a systems administrator detects a problem with the server. (The light can also be turned on by pressing the identiÞer button.) This indicator will help you locate which server in a rack needs servicing. In addition, you can use the identiÞer button to initiate several Þrmware commands to the system. See ÒEntering Firmware Boot Commands From the Front PanelÓ in this chapter. Note: A duplicate identiÞer light/button is on the serverÕs back panel. Hot-Pluggable ATA Drives The original Xserve and Xserve (Slot-Load) include four hard drive bays at the front of the server; the original Xserve supports hot-pluggable Apple ATA/100 drive modules and the Xserve (Slot Load) supports ATA/133 drive modules. The Xserve (Cluster Node) includes just one Apple ATA/133 drive module. In the original Xserve and Xserve (Slot Load) drive bays are numbered 1Ð4, beginning with the far left bay. The bay in which a drive is installed determines its master/slave position, thereby eliminating the need for jumpers or special drive conÞguration. The drive installed in bay 1 is the master drive and should have the operating system installed on it. In all three models, you can replace or install hard drives while the server is running; you do not need to shut down or open the server Þrst. 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 ÒHard DriveÓ in the Take Apart chapter.
2 - Xserve Troubleshooting General Information Diagnostics Four types of diagnostics are available for Xserve: ¥ status lights ¥ remote monitoring ¥ Apple Hardware Test ¥ Apple Service Diagnostic For more information, see ÒDiagnostic ToolsÓ below. DDR Memory The serverÕs logic board includes four memory slots, which accept double data rate (DDR) SDRAM DIMMs. Memory can be expanded to a maximum of 2 gigabytes. DIMMs used in the original Xserve must Þt these speciÞcations: ¥ PC2100 DDR SDRAM, also known as DDR-266 ¥ 2.5 volt ¥ 64-bit wide, 184-pin module ¥ unbuffered (do not use registered or buffered DRAM) ¥ maximum height of 1.3 inches DIMMs used in Xserve (Slot Load) and Xserve (Cluster Node) must Þt these speciÞcations: ¥ PC2700 DDR SDRAM, also known as DDR-333 ¥ 2.5 volt ¥ 64-bit wide, 184-pin module ¥ 16 memory devices maximum ¥ unbuffered (do not use registered or buffered DRAM) ¥ maximum height of 1.25 inches Important: DIMMs from older Macintosh computers are not compatible with Xserve. Do not use older DIMMs even if they Þt into the DIMM slots. Ports The standard conÞguration of the original Xserve includes the following ports on the back panel: one or two gigabit Ethernet ports, two FireWire 400 ports, two USB ports, a serial port that supports RS-232 or RS-422 connection, and a VGA monitor port. There is also one FireWire 400 port on the front of the server. The standard conÞguration of Xserve (Slot Load) includes the following ports on the back panel: one or two gigabit Ethernet ports, two FireWire 800 ports, two USB ports, a serial port that supports RS-232 connection, and a VGA monitor port. There is also one FireWire 400 port on the front of the server. The standard conÞguration of Xserve (Cluster Node) includes the following ports on the back panel: one gigabit Ethernet port, two FireWire 800 ports, two USB ports, and a serial
Xserve Troubleshooting - 3 General Informationport that supports RS-232 connection. There is also one FireWire 400 port on the front of the server. System administrators or service providers can connect a laptop computer or terminal to the serial port and then use command-line tools to change settings on the server. The connection requires a serial cable with these speciÞcations: ¥ DB9 connector ¥ 8-bit ¥ no parity ¥ 1 stop bit ¥ 9600 kbps Note: For a diagram of the ports location, see ÒExternal ViewsÓ in the Views chapter. PCI and AGP Cards In the original Xserve and Xserve (Slot Load), there are three slots available for PCI expansion cards. Two slots are on a riser card located at the back left corner of the logic board; an additional slot is on a riser card at the back right corner of the logic board. A PCI card that is 7 inches long can be installed in either riser card; a PCI card that is 12 inches long can be installed only in the dual-slot riser. In addition, an AGP card can be installed in the single-slot riser. The Xserve (Cluster Node) includes just two slots for PCI cards on the dual riser card. The standard conÞguration for the original Xserve and Xserve (Slot Load) comes with a VGA video card installed in the bottom slot of the dual-slot riser and a gigabit Ethernet card installed in the single-slot AGP/PCI riser. In addition, a high-end AGP video card is available as a CTO option for these models; it replaces the gigabit Ethernet PCI card in the single-slot riser position and requires installing an AGP/AGP riser card that is bundled with the video card. The Apple Fibre Channel PCI card, which allows connection to Xserve RAID, is also available as a CTO option for Xserve and Xserve (Slot Load); it must be installed in the top slot of the dual-slot riser. Note: Combined power consumption for all expansion slots within one unit should not exceed 45 W.
4 - Xserve Troubleshooting General Information Block Diagram Ethernet Port Firewire Port 1 Firewire Port 2 PCI Slots Network Card Slot L3 CachePowerPC G4 Microprocessor U2 memory controller and PCI bus bridge Ethernet PHY Firewire PHY USB Port 1 USB Port 2 DIMM Slots Main Logic Board Processor Module Boot ROM ATA InterfaceATA Interface Firewire PHYFirewire Port 3 PCI Bridge PCI Bridge U2 Memory Controller and PCI Bus Bridge Apple Drive Module Connectors Internal Optical Drive ConnectorEIDE Bus Serial Port PMU99 Power Controller KeyLargo I/O Device and Disk Controller
Xserve Troubleshooting - 5 General Information Resetting the PMU on the Logic Board The PMU (Power Management Unit) is a microcontroller chip that controls all power functions for the server. The PMU is a computer within a computer. Its function is to: ¥ tell the server to turn on, turn off, sleep, wake, idle, etc. ¥ manage system resets from various commands. ¥ maintain parameter RAM (PRAM). ¥ manage the real-time clock. Important: Be very careful when handling the logic board. The PMU is very sensitive and touching the circuitry on the logic board can cause the PMU to crash. If the PMU crashes and is not reset, the battery life goes from about Þve years to about two days. Note: For the location of the PMU reset button, see ÒLogic Board DiagramÓ in the Views chapter. Many system problems can be resolved by resetting the PMU chip. When you have a server that fails to power up, follow this procedure before replacing any modules: 1. Disconnect the power cord and check the battery in the battery holder. The battery should read 3.3 to 3.7 volts. If the battery is bad, replace it, wait ten seconds, and then proceed to step 2. If the battery is good, go directly to step 2. 2. Press the PMU reset button once and then proceed to step 3. Do not press the PMU reset button a second time because it could crash the PMU chip. 3. Wait ten seconds before connecting the power cord and powering on the server. If the server powers on, go to step 4. If the server does not power on, there is something else wrong with it; refer to the ÒSystemÓ section of ÒSymptom ChartsÓ in this chapter. 4. Run Apple Hardware Test to verify the system. Note: The above procedure resets the serverÕs PRAM. After resetting the PMU, be sure to reset the time, date, and other system parameter settings.