AlphaServer DS20E
AlphaStation DS20E
Reference Guide
Order Number: ER-K8F6W-UA. D01
This manual is for managers and operators of Compaq
AlphaServer DS20E / AlphaStation DS20E systems.
Compaq Computer Corporation
Revised, August 2000
© 2000 Compaq Computer Corporation.
COMPAQ, the Compaq logo, and A lph aS erver Reg is ter ed i n U . S. Patent and Trademark Offi ce.
OpenVMS and Tru64 are trademarks of Compaq Information Technologies Group, L.P.
Linux is a regist ered tradem ark of Linus To rvalds in sever al c ountries. UNIX is a registe red tradema rk
of The Open Group in th e U . S. and othe r countries.
All other product names mentioned herein may be trademarks of their respective companies.
Compaq shall not be liable for technical or editorial errors or omissions contained herein. The
information in this document is subject to change without notice.
Contents
Preface ........................................................................................................................xi
Chapter 1 System Overview
1.1 System Enclosures................................................................................ 1-2
1.2 System Parts (Front/Side View)............................................................ 1-4
1.3 System Parts (Rear View)..................................................................... 1-6
1.4 Operator Control Panel......................................................................... 1-8
1.5 System Board ...................................................................................... 1-10
1.6 Server Feature Module ....................................................................... 1-12
1.7 PCI Slots ............................................................................................. 1-14
1.8 Power Supplies.................................................................................... 1-16
1.9 Removable Media Storage................................................................... 1-18
1.10 Hard Disk Drive Storage..................................................................... 1-19
1.11 Two-Way Combination Module........................................................... 1-20
1.12 Console Terminal................................................................................ 1-21
Chapter 2 Installing the Pedestal System
2.1 System Dimensions and Service Area...................................................2-2
2.2 Power Requirements............................................................................. 2-3
2.3 Shipment Box........................................................................................ 2-4
2.4 Pedestal Setup ......................................................................................2-5
2.5 System Access ....................................................................................... 2-6
2.6 Installing a Pedestal Kit ....................................................................... 2-7
Chapter 3 Installing the Rackmount System
3.1 Rackmount Documentation................................................................... 3-2
3.2 Power Requirements............................................................................. 3-3
3.3 Shipment Box........................................................................................ 3-4
3.4 Marking the Installation Area.............................................................. 3-5
3.5 Rack Accessories ................................................................................... 3-6
3.6 Preparing the System Chassis.............................................................. 3-8
3.7 Preparing the Rack ............................................................................. 3-12
iii
3.8 Installing the System Chassis............................................................. 3-16
3.9 Installing the Interlock System .......................................................... 3-18
3.10 Installing the Cable Management Arm .............................................. 3-20
3.11 Dressing the Cables ............................................................................ 3-22
3.12 Attaching the Front Bezel................................................................... 3-24
Chapter 4 Booting and Installing an Operating System
4.1 Setting Boot Options............................................................................. 4-2
4.1.1 auto_action...................................................................................... 4-3
4.1.2 bootdef_dev ..................................................................................... 4-5
4.1.3 boot_file........................................................................................... 4-6
4.1.4 boot_osflags..................................................................................... 4-7
4.1.5 ei*0_inet_init or ew*0_inet_init.................................................... 4-11
4.1.6 ei*0_protocols or ew*0_protocols................................................... 4-12
4.2 Booting Tru64 UNIX........................................................................... 4-13
4.2.1 Booting Tru64 UNIX over the Network........................................ 4-16
4.3 Starting a Tru64 UNIX Installation ................................................... 4-18
4.4 Booting Linux...................................................................................... 4-20
4.5 Booting OpenVMS............................................................................... 4-24
4.6 Booting OpenVMS from the InfoServer.............................................. 4-26
4.7 Starting an OpenVMS Installation..................................................... 4-28
Chapter 5 Configuring and Installing Components
5.1 Preparing to Install Components.......................................................... 5-2
5.2 Removing the Side Cover (Pedestal)..................................................... 5-3
5.3 Removing the Top Cover (Rackmount) ................................................. 5-5
5.4 Memory Configuration.......................................................................... 5-6
5.4.1 Installing and Removing DIMMs ................................................... 5-8
5.5 CPU Configuration.............................................................................. 5-10
5.6 Installing a PCI or ISA Option ........................................................... 5-11
5.6.1 Installing a PCI Option................................................................. 5-12
5.6.2 Installing a Multichannel SCSI Option........................................ 5-14
5.7 Installing a Redundant Power Supply................................................ 5-16
5.8 Network Configuration ....................................................................... 5-18
5.9 Disk Drive Configuration.................................................................... 5-20
5.10 Installing Disk Drives ......................................................................... 5-22
5.10.1 Drive Status LEDs........................................................................ 5-24
5.11 Configuring the Storage Subsystem ................................................... 5-26
5.11.1 Connecting a Four-Slot Subsystem............................................... 5-26
5.11.2 Installing a Six-Slot Subsystem.................................................... 5-28
iv
5.12 Installing a Tape Drive ....................................................................... 5-35
5.13 External SCSI Expansion ................................................................... 5-37
5.14 AlphaBIOS Configuration Utilities..................................................... 5-38
5.15 Updating Firmware ............................................................................ 5-41
5.15.1 Sources of Firmware Updates....................................................... 5-42
5.15.2 Updating Firmware from the CD-ROM........................................ 5-43
Chapter 6 Remote Management Console
6.1 RMC Overview ......................................................................................6-2
6.2 Connecting to RMC............................................................................... 6-3
6.3 Modem Setup ........................................................................................ 6-4
6.4 Dial-In Procedure.................................................................................. 6-5
6.5 Halt Assertion....................................................................................... 6-7
6.6 RMC Commands................................................................................... 6-8
6.7 RMC Switch Pack ............................................................................... 6-14
6.7.1 Changing a Switch Setting ........................................................... 6-16
6.7.2 Resetting the RMC to Factory Defaults........................................ 6-17
6.8 Troubleshooting .................................................................................. 6-18
Chapter 7 Using the SRM Console
7.1 SRM Console Overview......................................................................... 7-2
7.1.1 Invoking the SRM Console ............................................................. 7-4
7.2 Command Summary ............................................................................. 7-5
7.3 Getting Help........................................................................................ 7-10
7.4 Displaying the Configuration.............................................................. 7-12
7.5 Displaying the Bootable Devices......................................................... 7-16
7.6 Displaying the Memory Configuration ............................................... 7-18
7.7 Displaying the Power Status............................................................... 7-19
7.8 Displaying the SRM Console Version ................................................. 7-20
7.9 Displaying the CPU Status................................................................. 7-21
7.10 Displaying the PALcode Version......................................................... 7-22
7.11 Booting an Operating System............................................................. 7-23
7.12 Configuring the ISA Bus..................................................................... 7-25
7.13 Testing the System.............................................................................. 7-28
7.14 Starting and Stopping CPUs............................................................... 7-30
7.14.1 halt (or stop).................................................................................. 7-30
7.14.2 continue ........................................................................................ 7-30
7.15 Updating Firmware ............................................................................ 7-32
7.16 Forcing a System Crash Dump........................................................... 7-36
7.17 Initializing the System........................................................................ 7-37
v
7.18 Reading a File ..................................................................................... 7-38
7.19 Configuring a PCI NVRAM Module.................................................... 7-40
7.20 Creating a Power-Up Script................................................................ 7-41
7.21 Loading AlphaBIOS ............................................................................ 7-43
7.22 Setting Console Security..................................................................... 7-44
7.22.1 Overview of Secure Mode.............................................................. 7-44
7.22.2 Setting the Console Password....................................................... 7-45
7.22.3 Setting the Console to Secure Mode ............................................. 7-47
7.22.4 Turning Off Security During a Console Session........................... 7-48
7.22.5 Returning to User Mode ............................................................... 7-51
7.23 Setting and Viewing Environment Variables..................................... 7-52
7.23.1 com*_baud .................................................................................... 7-56
7.23.2 console........................................................................................... 7-57
7.23.3 cpu_enabled .................................................................................. 7-58
7.23.4 ei*0_mode or ew*0_mode.............................................................. 7-60
7.23.5 kbd_hardware_type ...................................................................... 7-61
7.23.6 language........................................................................................ 7-62
7.23.7 os_type .......................................................................................... 7-63
7.23.8 pci_parity ...................................................................................... 7-64
7.23.9 pk*0_fast....................................................................................... 7-65
7.23.10 pk*0_host_id ................................................................................. 7-66
7.23.11 pk*0_soft_term.............................................................................. 7-67
7.23.12 tt_allow_login................................................................................ 7-69
Chapter 8 Troubleshooting
8.1 Error Beep Codes .................................................................................. 8-2
8.2 Diagnostic LEDs on OCP ...................................................................... 8-3
8.3 Power Problems..................................................................................... 8-4
8.4 Console-Reported Failures.................................................................... 8-5
8.5 Boot Problems ....................................................................................... 8-6
8.6 Thermal Problems and Environmental Status..................................... 8-8
8.7 Operating System Reported Failures ................................................... 8-9
8.8 Memory Problems ............................................................................... 8-10
8.9 PCI Bus Problems............................................................................... 8-11
8.10 SCSI Problems .................................................................................... 8-12
8.11 Fail-Safe Booter Utility....................................................................... 8-13
8.11.1 Starting the FSB........................................................................... 8-13
8.11.2 Preparing Diskettes...................................................................... 8-15
8.11.3 Updating Firmware ...................................................................... 8-16
vi
Chapter 9 Specifications
9.1 Physical Specifications.......................................................................... 9-2
9.2 Environmental Specifications ............................................................... 9-4
9.3 Electrical Specifications........................................................................ 9-5
9.4 Acoustical Data ..................................................................................... 9-7
9.5 Power Cord Requirements .................................................................... 9-8
9.5.1 General Requirements.................................................................... 9-8
9.5.2 Country-Specific Requirements...................................................... 9-9
Appendix A Regulatory and Safety Notices
A.1 Class A and Class B Ratings.................................................................A-1
A.1.1 Class A Device Notices....................................................................A-2
A.1.2 Class B Device Notices....................................................................A-4
A.2 Other Safety Notices.............................................................................A-6
A.2.1 Laser Devices..................................................................................A-6
A.2.2 Battery Replacement ......................................................................A-7
Index
vii
Examples
4–1 Booting Tru64 UNIX from a Local SCSI Disk .................................... 4-13
4–2 RIS Boot .............................................................................................. 4-16
4–3 Text-Based Installation Display ......................................................... 4-18
4–4 Linux Boot Output.............................................................................. 4-21
4–5 Booting OpenVMS from the Local CD-ROM Drive............................. 4-24
4–6 InfoServer Boot ................................................................................... 4-26
4–7 OpenVMS Installation Menu.............................................................. 4-28
7–1 Help (or Man)...................................................................................... 7-10
7–2 Show Config ........................................................................................ 7-12
7–3 Show Device........................................................................................ 7-16
7–4 Show Memory...................................................................................... 7-18
7–5 Show Power......................................................................................... 7-19
7–6 Show Version ...................................................................................... 7-20
7–7 Show Cpu ............................................................................................ 7-21
7–8 Show Pal.............................................................................................. 7-22
7–9 Tru64 UNIX Boot (Abbreviated)......................................................... 7-23
7–10 Isacfg ................................................................................................... 7-25
7–11 Test...................................................................................................... 7-28
7–12 Halt and Continue............................................................................... 7-30
7–13 Updating Firmware from Floppy ........................................................ 7-32
7–14 Crash................................................................................................... 7-36
7–15 Init....................................................................................................... 7-37
7–16 More .................................................................................................... 7-38
7–17 Prcache................................................................................................ 7-40
7–18 Editing the Nvram Script ................................................................... 7-41
7–19 Clearing the Nvram Script.................................................................. 7-41
7–20 AlphaBIOS .......................................................................................... 7-43
7–21 Set Password ....................................................................................... 7-45
7–22 Set Secure ........................................................................................... 7-47
7–23 Login ................................................................................................... 7-48
7–24 Clear Password ................................................................................... 7-51
7–25 Set envar and Show envar................................................................... 7-52
7–26 User-Created Environment Variable .................................................. 7-52
8–1 Running LFU ...................................................................................... 8-16
viii
Figures
1–1 DS20E System Variants ....................................................................... 1-2
1–2 System Parts ......................................................................................... 1-4
1–3 Ports and Connectors............................................................................ 1-6
1–4 Control and Status Indicators............................................................... 1-8
1–5 System Board ...................................................................................... 1-10
1–6 Server Feature Module ....................................................................... 1-12
1–7 PCI Slots (Rack Orientation) .............................................................. 1-14
1–8 Power Supplies (Pedestal Orientation)............................................... 1-16
1–9 Removable Media Storage................................................................... 1-18
1–10 Four-Slot and Six-Slot Storage Subsystems ....................................... 1-19
1–11 Combination Module ........................................................................... 1-20
1–12 Console Terminal Connections............................................................ 1-21
2–1 System Dimensions............................................................................... 2-2
2–2 Power Supply Requirements................................................................. 2-3
2–3 Unpacking the Shipment ...................................................................... 2-4
2–4 Cabling the System ............................................................................... 2-5
2–5 System Lock and Key............................................................................ 2-6
2–6 Pedestal Kit Contents ........................................................................... 2-8
2–7 Installing the Lower Panel.................................................................. 2-10
2–8 Installing the Upper Panel ................................................................. 2-12
2–9 Installing the Side Dress Panel .......................................................... 2-13
2–10 Installing the Side Access Cover ......................................................... 2-14
2–11 Installing the Door .............................................................................. 2-15
3–1 Power Requirements and Connections ................................................. 3-3
3–2 Rackmount System Shipment Box........................................................ 3-4
3–3 Rackmount Installation Area................................................................ 3-5
3–4 Mounting Hardware.............................................................................. 3-6
3–5 Attaching Mounting Brackets to Chassis ............................................. 3-8
3–6 Attaching Slide Brackets to Slides...................................................... 3-10
3–7 Attaching Slide Brackets to Rack Rails .............................................. 3-12
3–8 Stabilizing the Rack............................................................................ 3-14
3–9 Installing the System into an M-Series Rack ..................................... 3-16
3–10 Installing Shipping Screws ................................................................. 3-17
3–11 Installing the Interlock System .......................................................... 3-18
3–12 Installing the Cable Management Arm .............................................. 3-20
3–13 Dressing the Cables ............................................................................ 3-22
3–14 Attaching the Front Bezel................................................................... 3-24
5–1 Removing the Side Cover...................................................................... 5-3
5–2 Attaching the Antistatic Wrist Strap.................................................... 5-4
ix
5–3 Removing Top Cover ............................................................................. 5-5
5–4 Memory Slot Locations.......................................................................... 5-6
5–5 Installing DIMMs.................................................................................. 5-8
5–6 Removing DIMMs ................................................................................. 5-9
5–7 PCI Slots (Rack Orientation) .............................................................. 5-11
5–8 Installing a PCI Option ....................................................................... 5-12
5–9 Multichannel SCSI Installation.......................................................... 5-14
5–10 Adding a Third Supply (Pedestal Orientation) ................................... 5-16
5–11 Network Connection............................................................................ 5-18
5–12 Installing and Removing Disk Drives................................................. 5-22
5–13 Disk Drive LEDs ................................................................................. 5-24
5–14 Subsystem Backplane Connections..................................................... 5-26
5–15 Tape Drive Installation ....................................................................... 5-35
5–16 AlphaBIOS Boot Screen ...................................................................... 5-38
5–17 AlphaBIOS Setup Menu...................................................................... 5-39
5–18 Run Maintenance Program Dialog Box .............................................. 5-40
5–19 Loadable Firmware Update Utility..................................................... 5-41
6–1 RMC Connections.................................................................................. 6-4
6–2 RMC Switch Pack Defaults................................................................. 6-14
8–1 LED Patterns During Power-Up (Rack Orientation)............................ 8-3
8–2 FSB Switch "On" Setting (Rackmount Orientation).......................... 8-14
Tables
2–1 Pedestal Kit Contents ........................................................................... 2-9
3–1 Mounting Hardware Description .......................................................... 3-7
4–1 OpenVMS Boot Flag Settings ............................................................... 4-9
5–1 Four-Slot SCSI ID Orientation ........................................................... 5-20
5–2 Six-Slot SCSI ID Orientation.............................................................. 5-21
5–3 Drive Status........................................................................................ 5-25
6–1 RMC Command Summary.................................................................... 6-8
6–2 Status Command Fields...................................................................... 6-13
6–3 RMC Switch Pack Functions............................................................... 6-15
6–4 Troubleshooting RMC ......................................................................... 6-18
7–1 Summary of SRM Console Commands .................................................7-5
7–2 Notation Formats for SRM Console Commands................................... 7-7
7–3 Special Characters for SRM Console .................................................... 7-8
7–4 Device Naming Conventions............................................................... 7-16
7–5 PCI Address Assignments................................................................... 7-17
7–6 Environment Variable Summary........................................................ 7-54
8–1 Error Beep Codes .................................................................................. 8-2
8–2 Troubleshooting Power Problems ......................................................... 8-4
x
8–3 Troubleshooting Console-Reported Failures......................................... 8-5
8–4 Troubleshooting Boot Problems ............................................................ 8-6
8–5 Operating System Reported Failures ................................................... 8-9
8–6 Troubleshooting Memory Problems .................................................... 8-10
9–1 Physical Specifications.......................................................................... 9-2
9–2 Environmental Specifications ............................................................... 9-4
9–3 Electrical Specifications........................................................................ 9-5
9–4 Acoustical Data ..................................................................................... 9-7
9–5 Power Cord Requirements by Country ................................................. 9-9
xi
Preface
Intended Audience
This manual is for managers and operators of Compaq AlphaServer DS20E /
AlphaStation DS20E systems.
WARNING: To prevent injury, access to internal components is
limited to persons who have appropriate technical training and
experience. Such persons are expected to understand the
hazards of working within this equipment and take measures to
minimize danger to themselves or others. These measures
include:
1. Remove any jewelry that may conduct electricity.
2. Wear an anti-static wrist strap when handling internal
components.
Document Structure
This manual uses a structured documentation design. Topics are organized into
small sections, usually consisting of two facing pages. Most topics begin with an
abstract that provides an overview of the section, followed by an illustration or
example. The facing page contains descriptions, procedures, and syntax
definitions.
This manual has nine chapters and one appendix.
• Chapter 1, System Overview, describes the components of the system.
• Chapter 2, Installing the Pedestal System, gives procedures for setting
up the pedestal system.
• Chapter 3, Installing the Rackmount System, gives procedures for
installing the rack-mountable system into an M-Series cabinet.
xiii
Chapter 4, Booting and Installing an Operating System, explains the
SRM boot environment variables and gives examples of booting Tru64 UNIX,
OpenVMS, and Linux.
Chapter 5, Configuring and Installing Components, shows how to
configure and install components such as memory DIMMs and PCI options.
Chapter 6, Remote Management Console, explains how to use the Remote
Management Console to monitor and control the system.
Chapter 7, Using the SRM Console, describes the SRM commands and
environment variables used to configure the system.
Chapter 8, Troubleshooting, gives basic troubleshooting procedures.
Chapter 9, Specifications, lists the physical, electrical, and environmental
specifications for the system.
Appendix A, Regulatory and Safety Notices, supplies the regulatory
information for Class A and Class B systems as well as safety notices.
Documentation Titles
Table 1 Documentation
Title Order Number
DS20E Reference Guide ER-K8F6W-UA
DS20E Basic Installation ER-K8F6W-IM
DS20E Processor Upgrade ER-PD12U-UG
KN311 CPU Installation Card EK-DSCPU-IN
Memory Option Installation Card EK-MS340-IN
H9A10/H9A15 Rack-Mounting
Template
Release Notes EK-K8F6W-RN
EK-DS20E-TP
xiv
Information on the Internet
Visit the following Compaq DS20E Web site for support resources for this
system.
http://www.compaq.com/alphaserver/ds_series.html
Information and files for performing firmware updates is available at:
ftp://ftp.digital.com/pub/Digital/Alpha/firmware/readme.html
xv
Chapter 1
System Overview
This chapter provides an overview of the AlphaServer/AlphaStation DS20E
system, including:
• System enclosures
• System parts (front/side view)
• System parts (rear view)
• Operator control panel
• System board
• Server feature module
• PCI slots
• Power supplies
• Removable media storage
• Hard disk drive storage
• Two-way combination module
• Console terminal
System Overview 1-1
1.1 System Enclosures
The DS20E family consists of a standalone pedestal and a rackmount
system.
Figure 1–1 DS20E System Variants
Rackmount
DS20E Reference Guide
1-2
Pedestal
CAT0039
Enclosure
The system is housed in an enclosure containing the system board, other logic
modules, and two power supplies (maximum of three) with internal fans. The
enclosure has bays for internal mass-storage devices, including a combination
IDE CD-ROM/floppy disk drive, one available half-height removable bay, and
either four 1.6-inch or six
1-inch hot-swap drive bays. An operator control panel includes Power, Reset,
and Halt buttons.
The system can be used as a desk-side pedestal in the vertical position, or with
the addition of brackets, can be mounted in the horizontal position in a
standard rack.
Common Components
The basic building block of the system is the chassis, which houses the following
common components:
• Up to two CPUs, based on the 21264 Alpha chip
• Up to 16, 200-pin memory DIMMs
• Five 64-bit PCI slots and one shared 32-bit ISA or 64-bit PCI slot
• A removable media bay that accommodates one 5-25-inch slim- height
CD/floppy disk combination drive and one 5.25-inch half- height tape device
• One storage disk cage that houses four 1.6-inch drives or a cage that houses
six 1.0-inch drives
• Two 375-watt power supplies and a bay for a third supply for redundancy
• Two serial ports and one parallel port for external options
• An operator control panel with a Power button, Halt button, and Reset
button, and diagnostic LEDs
System Overview 1-3
1.2 System Parts (Front/Side View)
Figure 1–2 identifies the main components of the system in a pedestal
version. Components visible from the front and with the side panel
removed are shown.
Figure 1–2 System Parts
5
6
7
8
4
3
2
1
9
2
4
1
10
1
CAT0151b
DS20E Reference Guide
1-4
Front Components
➊
➋
➌
Removable side cover
Symbios SCSI adapter board
System board
➍ CPU modules
➎ Server feature module
➏ Operator control panel (OCP)
➐
➑
➒
➓
①
②
Removable media drive bay
Combination CD-ROM/floppy drive
Hard disk drives
Door
Power supplies
Storage subsystem
System Overview 1-5
1.3 System Parts (Rear View)
Figure 1–3 shows the system ports and connectors on the rear of the
chassis.
Figure 1–3 Ports and Connectors
1
10
9
2
8
7
6
5
4
3
2
3
1
CAT0019A
DS20E Reference Guide
1-6
Rear Components
➊
➋
➌
SCSI breakouts
One shared 64-bit PCI/ 16-bit ISA slot
Five 64-bit PCI slots
➍ AC power inlet
➎ Ethernet port
➏ Mouse port
➐
➑
➒
➓
➀
Keyboard port
Universal serial bus (USB) (not supported)
Serial port (COM1)
Serial port (COM2)
Parallel port
➁ System fan 0
➂ System fan 1
System Overview 1-7
1.4 Operator Control Panel
The operator control panel provides system controls and status
indicators. The controls are the Power, Halt, and Reset buttons. The
panel has a green power LED, a yellow halt LED, and four diagnostic
LEDs.
Figure 1–4 Control and Status Indicators
1234
6
2
1
3
4
5
CAT0018A
DS20E Reference Guide
1-8
➊
Power button. This button is a latching switch. Pressing the
Power button on powers on the system. Pressing the button to
standby turns off all DC voltages except Aux 5 volts. The 5 volt
standby powers the remote management console (RMC). See
Chapter 6.
➋
➌
➍
➎
➏
Remote Commands
If the system is being managed remotely, commands issued at the remote
management console (RMC) can be used to emulate the functions of the
operator control panel. See Chapter 6.
RMC Command Function
poweron
Power LED (green). Lights when the Power button is pressed.
Reset button. A momentary contact switch that restarts the
system and reinitializes the console firmware.
Halt LED. Halt condition (yellow). Lights when you press the
Halt button.
Halt button. Halts the system. Momentary contact switch.
Diagnostic LEDs. Programmable by software. Blink at various
console states. See Chapter 8 for details.
Turns on power. Emulates pressing the Power
button to the On position.
poweroff
reset
halt
haltin
haltout Releases a halt created with haltin.
Turns off power. Emulates pressing the Power
button to the Off position.
Resets the system. Emulates pressing the
Reset button.
Halts the system.
Halts the system and causes the halt to remain
asserted.
System Overview 1-9
1.5 System Board
The system board contains slots for CPUs, memory DIMMs, and I/O
options.
Figure 1–5 System Board
2
BA
3
1
3
4
5
➊
CPU slots (CPU0 is right slot) ➍ IDE
➋
I/O slots ➎ Floppy
➌
Memory slots ➏ SCSI
DS20E Reference Guide
1-10
6
1
1
CAT0030
All memory and I/O components are located on a single system board that
contains a memory subsystem, PCI bus, ISA bus, integrated SCSI
fast/wide/Ultra I/O controllers, and option slots for PCI-based and ISA-based
option modules.
Processor Module
The system supports up to two processor modules that can be installed on the
system board. Each processor module contains a 21264 microprocessor. The
21264 microprocessor is a superscalar chip with out-of-order execution and
speculative execution to maximize speed and performance. It contains four
integer execution units and dedicated execution units for floating-point add,
multiply, and divide. The chip also has an integrated instruction cache and a
data cache. Each cache consists of a 64 KB two-way set associative, virtually
addressed cache divided into 64-byte blocks. The data cache is a physically
tagged, write-back cache.
The EV6 (500 MHz) processor module contains 4 MB secondary
B-cache (backup cache) consisting of late-write synchronous DRAMs (dynamic
random access memory) that provide low latency and high bandwidth. The
EV67 (667 MHz) processor module has an 8 MB DDR (dual data rate). See the
documentation that accompanies a processor upgrade for instructions on
installing additional processors.
Memory
The system supports up to four banks of memory on the system board. Each
bank contains four slots for a total of 16 slots. The system uses 200-pin buffered
synchronous dual in-line memory module (DIMMs). See Chapter 5 for
instructions on installing DIMMs.
System Overview 1-11
1.6 Server Feature Module
A separate server feature module (SFM) affixed to the system chassis
monitors environmental conditions in the system. The SFM supports
the two system fans and three power supplies and monitors the state of
the CPU fans on the system board.
Figure 1–6 Server Feature Module
1
J1
6
7
J2
ON
S1
OFF
J7
J6
45
➊
Power connector
➋
Operator control panel connector
➌
Main logic board connector
➍
Fan 0 connector
2
J3
J5
3
PK0981
➎
Fan 1 connector
➏
Side cover interlock connector
➐
RMC switch pack (see Chapter 6)
DS20E Reference Guide
1-12
N+1 Fan Configuration
The SFM supports and monitors the two system fans. For optimal cooling, both
fans are always running. If one of the fans fails or is hot-swapped for servicing,
the system continues to function with the other fan running at full speed.
The fan thermostat is set to drive the fans at their minimum speed in
environments below 26ºC to keep noise levels low. As system temperature rises,
the fan speed increases to increase cooling. If the system temperature rises
above 55ºC (due to high system loads or high ambient temperature), the system
software receives an I/O interrupt and the system shuts down within 30
seconds.
Cover Interlock
The SFM has a side cover interlock connector that prevents the system from
operating with the system cover open. System power cannot be turned on until
the cover is closed. If the cover is opened while the system is running, power
shuts off immediately.
System Overview 1-13
1.7 PCI Slots
The system board has six, 64-bit PCI slots, one of which is a
combination PCI/ISA slot. The callouts in Figure 1–7 show the PCI slot
locations on the system board. Slot 1
only. Slots 2 through 6 support a full-length card. Slot 6
with an ISA slot (ISA slot 1).
Figure 1–7 PCI Slots (Rack Orientation)
4 3
5
6
2 1
➊ supports a half-length card
➏ is shared
DS20E Reference Guide
1-14
CAT0046
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