HP D5970A - NetServer - LCII User manual

HP NetServer LC 2000r
Rack Cabling Reference Guide
HP Part Number D8514-90008
Printed November 1999

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Notice
The information contained in this document is subject to change without notice.
Hewlett-Packard makes no warranty of any kind with regard to this
material, including, but not limited to, the implied warranties of
merchantability and fitness for a particular purpose. Hewlett-Packard shall not
be liable for errors contained herein or for incidental or consequential damages in
connection with the furnishing, performance, or use of this material.
Hewlett-Packard assumes no responsibility for the use or reliability of its software
on equipment that is not furnished by Hewlett-Packard.
This document contains proprietary information that is protected by copyright. All
rights are reserved. No part of this document may be photocopied, reproduced, or
translated to another language without the prior written consent of
Hewlett-Packard Company.
APC®is a registered trademark of American Power Conversion Corporation.
Hewlett-Packard Company
Network Server Division
Technical Communications/MS 45SLE
19055 Tantau Avenue
Cupertino, CA 95014 USA
© Copyright 1999, Hewlett-Packard Company.
Audience Assumptions
The guide is for the person who installs, administers, and troubleshoots LAN servers.
Hewlett-Packard Company assumes you are qualified in the following areas:
•you are qualified in the servicing of computer equipment
•you are trained in recognizing hazards in products with hazardous energy
levels
•you are familiar with weight and stability precautions for rack installation

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Contents
1 Preparation for Cabling the NetServer LC 2000r........................................ 1
About Cabling the LC 2000r........................................................................... 1
Before You Use this
Reference Guide ....................................................... 1
The HP NetServer LC 2000r...................................................................... 1
Site Preparation............................................................................................. 2
Site Preparation Checklist.......................................................................... 3
Site Preparation -- Circuit Breakers............................................................ 4
Rack Assembly and Cabling Cautions and Warnings..................................... 5
Unterminated Power Cords Require Licensed Electrician........................... 5
Prevent Electrical Shock............................................................................ 6
Prevent Damage to Components............................................................... 6
Generic Rack Assembly Steps....................................................................... 7
Suggested Method for Building an HP NetServer Rack Installation ............ 7
2 Rack Cabling References.......................................................................... 15
Rack Configuration Tools............................................................................. 15
Power Cabling References and Guidelines.................................................. 15
Power Considerations for the HP NetServer LC 2000r............................. 15
Power Cables and Components Available ............................................... 16
Power Distribution Units .......................................................................... 19
Guidelines for Powering the LC 2000r in a Rack...................................... 23
Power and Current for Estimating Supply Needs...................................... 24
Data Cabling References and Guidelines..................................................... 29
Key Cabling Guidelines Used in Developing a Rack Layout..................... 29
Cable Guide Placement Considerations Due to Data Cable Lengths........ 29
Cooling Requirements for the LC 2000r....................................................... 30
3 Procedure for Connecting and Routing Cables to the LC 2000r............. 31
Step 1: Prepare to Cable the HP NetServer LC 2000r.................................. 31
Assess How Components Will be Connected to the Server...................... 31
Attach Cable Guide to Rack Column........................................................ 31
Mount the Cable Management Arm ......................................................... 31
Mount Power Distribution Units................................................................ 32
Step 2: Connect the LC 2000r Data Cables to Peripheral Components ........ 32
Plan Data Connections............................................................................ 32

Contents
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Overview of LC 2000r Data Connections ................................................. 32
Attach Data Cables to the Server............................................................. 34
Attach Data Cables to Other Components ............................................... 34
Step 3: Cable the LC 2000r for Power.......................................................... 34
Attaching Server and Component Power Cables...................................... 35
Determining and Balancing Current Draw on Two Circuits in One Rack... 35
100/120 VAC Rack Power Configurations................................................ 37
208V PDU Rack Power Configurations.................................................... 40
230/240V PDU Rack Power Configurations ............................................. 42
Redundant Power Configuration.............................................................. 45
High Density Configuration...................................................................... 46
Step 4: Managing and Routing Cables......................................................... 47
Using the Cable Management Arm and the Cable Guides........................ 47
Route and Tie Cables into the Management Arm..................................... 47
Step 5: Powering Up and Powering Down the Components in the Rack....... 50
Power Up Sequence................................................................................ 50
Power Down Considerations.................................................................... 50
A Cabling Checklist ...................................................................................... 51
B Considerations in Mounting the Redundant Switch ................................ 53
Index............................................................................................................... 57

1
1 Preparation for Cabling the
NetServer LC 2000r
About Cabling the LC 2000r
NOTE A checklist for the cabling process is included in Appendix A.
Before You Use this Reference Guide
This Cabling Reference Guide assumes that you have the rack assembly process
completed, have mounted the HP NetServer LC 2000r, and are ready to cable the
components in the rack enclosure.
If you want a high-level checklist to use in this process, see Appendix A.
For instructions on how to install the HP NetServer LC 2000r in a rack, consult
the Installation Road Map shipped with your rack or the Installation Guide
shipped with your NetServer unit.
NOTE For instructions on how to assemble other components in a
rack, please find and follow the documentation shipped with
your rack components. If there is no such documentation with
your rack and components, check the separately orderable
installation kit. Or, use the generic rack assembly process
described in this chapter.
The HP NetServer LC 2000r
This cabling reference is for the rack optimized HP NetServer LC 2000r shown in
Figure 1-1.

Chapter 1 Preparation for Cabling the HP NetServer LC 2000r
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Figure 1-1. The HP NetServer LC 2000r
Site Preparation
You may want to copy and use the site preparation checklist in this section
(Table 1-1). Doing so before you begin to install and cable the NetServer may
reveal actions you can take to support your success. Also be sure to read the
section on site preparation of circuit breakers.

Chapter 1 Preparation for Cabling the HP NetServer LC 2000r
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Site Preparation Checklist
Table 1-1. Site Preparation Checklist
HP NetServer General Guidelines
Logical and physical network design provided
Server configuration parameters determined
Disk partition and directory structure determined
Required incoming power and data cabling in place
Working LAN, one working client, one working printer available (if integratinginto an
existing network)
Software license requirements met
Networking peripherals connected
Floor
Ensure the floor where the NetServer rack is to be installed is level
Assess floor strength and ensure it is sufficient to support the type of rack you have
ordered. (See the rack documentation included with your rack.)
Ensure sufficient area to accommodate your rack, including up to 24 inches (600 mm) rear
door clearance and 36 inches (900 mm) front door clearance.
Power
Correct size, type, and rating of receptacles, circuits, and circuit breakers; see the section
entitled “Site Preparation: Circuit Breakers.”
Locate close enough to power sources so that power cords will reach
If raised floor, need floor tile(s) with a cutout for cables, all posts electrically grounded
Facility for grounding each rack to earth connection to ensure earth ground continuity for
circuits to be used for rack mounted equipment

Chapter 1 Preparation for Cabling the HP NetServer LC 2000r
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Table 1-1. Site Preparation Checklist (Continued)
Environment and Space Requirements
Must meet OSHA, local code, and HP specifications for safety and supportability (3 feet
minimum access in front and rear of electrical cabinets)
Side access of 24 inches improves cable routing and management
Optimal: 24 hour air conditioning (68 - 72 deg. F; 20 - 22 deg. C, 40 - 60% RH)
Minimum: Maintain temperature inside NetServer enclosure between 41 and 95 deg. F,
5 - 35 deg. C
Enough table or work space for console terminal and user guides
Bookshelf for documentation
Area to store equipment until time of installation
Ensure all equipment and/or shipping pallets can fit through doorways, hallways, and
into and out of elevators
Data & Voice Communications (Pre-Tested and Verified)
Voice phone located at system console terminal with cord long enough to reach all parts
of the rack installation
Phone line for remote support at each system
Ethernet, FDDI, Token Ring, or other network connection standard
System Parameters
Hostname
IP address
Subnet Mask
Gateway IP Address
Gateway Host Name
DTC Node Name
Hardware Configuration, Cables, and Other Equipment
Availability of I/O paths and SCSI addresses for add-on devices
Availability of I/O backplane slots, memory slots, etc.
Valid, supportable configuration for added devices, interfaces, memory, etc.
Correct type and length of cables, as specified in order documents
Site Preparation -- Circuit Breakers
When you connect the HP NetServer LC 2000r to an AC power source, the server
temporarily draws a large “inrush current.” This occurs even when the system is in

Chapter 1 Preparation for Cabling the HP NetServer LC 2000r
5
standby mode. Inrush current is much greater than the server’s normal operating
needs. Generally, your external AC power source can handle the inrush current.
However, if you install several HP NetServers on one circuit, precautions are
necessary. For instance, if there is a power failure and power is then restored all
the servers immediately begin to draw inrush current at the same time. If the
circuit breakers on the incoming power line have insufficient capability, they may
trip and thus prevent the servers from powering up.
When preparing your site for installation, allow for the additional inrush current.
Consider the following before installing the server in your environment:
•In North America, a 20-amp-minimum circuit is to be used with one
NEMA AB1 class 14B breaker for each 16-amp Power Distribution Unit
that is to be connected to an HP NetServer LC 2000r.
•In Europe:
◊For a single LC 2000r unit in a rack, use a 16-amp-minimum circuit
with one IEC MCB C-type breaker for each 16-amp Power Distribution
Unit.
◊For multiple LC 2000r units in a rack, use a 16-amp-minimum circuit
with one IEC MCB D-type breaker for each 16-amp Power
Distribution Unit.
NOTE Some local codes do not allow a 16-amp device to be
connected to a 16-amp service. Consult a qualified electrician
or local regulatory authority before beginning electrical site
preparation.
Rack Assembly and Cabling Cautions and
Warnings
Unterminated Power Cords Require Licensed Electrician
In some cases in the 230/240V environment, the Uninterruptible Power Supply
(UPS) is shipped with a power cord that is unterminated. The reason is that the
current demand of a fully loaded rack may exceed the demand for the normal
circuit in some countries. Therefore, HP recommends that you have a qualified
electrician or electrical engineer analyze the current demand for each branch
circuit used by rack mounted equipment. Proper wiring and cord termination are
part of the same process.

Chapter 1 Preparation for Cabling the HP NetServer LC 2000r
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Prevent Electrical Shock
WARNING Ensure site electrical circuits have reliable earth grounding.
Never operate products in any rack enclosure with the ground
connector disconnected. Although leakage current from any
one device may be minimal, cumulative leakage current of
equipment mounted in a rack may exceed 5mA, and could
reach 15mA. This level of current can be dangerous, unless a
reliable earth ground is in place. Thus, reliable ground
circuit continuity is vital to safe operation of this system.
WARNING Prevent shock hazard by disconnecting power and telephone
cords when you service or install components.
Prevent Damage to Components
CAUTION Rack optimized products are sensitive to static electricity
(ESD). When installing components, take precautions against
ESD damage. Wear a wrist-strap and use a static-dissipating
work surface connected to the server chassis when handling
printed circuit boards, memory devices, and processor chips or
modules. Ensure that the metal of the wrist-strap contacts your
skin and that the alligator clip is attached to a static-neutral
surface.
CAUTION Power up the components one at a time. Turning on an entire
rack at one time may create damaging and dangerous
electrical surges that could trip circuit breakers in the system.
Follow instructions in the section entitled “Power Up
Sequence” at the end of Chapter 3 to minimize current inrush.