Apple XSERVE RAID User Manual
User’s Guide
Xserve RAID
Includes hardware setup
and expansion, basics of
using RAID, and important
safety information for
Xserve RAID systems
K
Apple Computer, Inc.
©
2003 Apple Computer, Inc. All rights reserved.
Under the copyright laws, this manual may not be copied, in whole or in part, without the written consent of Apple.
Your rights to the software are governed by the accompanying software license agreement.
The Apple logo is a trademark of Apple Computer, Inc., registered in the U.S. and other countries. Use of the
“keyboard” Apple logo (Option-Shift-K) for commercial purposes without the prior written consent of Apple may
constitute trademark infringement and unfair competition in violation of federal and state laws.
Every effort has been made to ensure that the information in this manual is accurate. Apple is not responsible for
printing or clerical errors.
Apple Computer, Inc.
1 Infinite Loop
Cupertino, CA 95014-2084
408-996-1010
http://www.apple.com
Apple, the Apple logo, FireWire, the FireWire logo, Mac, Macintosh, and Power Mac are trademarks of Apple
Computer, Inc., registered in the U.S. and other countries.
Xserve is a trademark of Apple Computer, Inc.
Other company and product names mentioned herein are trademarks of their respective companies. Mention of
third-party products is for informational purposes only and constitutes neither an endorsement nor a
recommendation. Apple assumes no responsibility with regard to the performance or use of these products.
Simultaneously published in the United States and Canada.
Contents
Preface
About This Guide 7
1 Introducing Xserve RAID 9
Unpacking the System 10
Your System at a Glance—Front Panel 12
Your System at a Glance—Back Panel 14
Your System at a Glance—Mounting Hardware 16
2 Preparing to Install Xserve RAID
in a Rack 19
Guidelines for Installation 19
Precautions for Handling the System 19
Choosing the System’s Location in the Rack 20
Rack Stability 21
Electrical Power 21
Operating Environment 22
Security 22
3
3 Mounting Xserve RAID in a Rack 23
Getting Ready to Install the System 24
Determine the Position for the System in the Rack 25
Prepare the System for Installation 26
Installing the System 26
Assemble the Brackets and Extenders 27
Mount the System in the Rack 34
Secure the System in the Rack or Cabinet 35
Moving the Xserve RAID System 36
4 Connecting Xserve RAID to a Host System and a Network 37
Installing the Host Bus Adapter Card in the Host System 38
Connecting Xserve RAID to a Host System or Switch 38
About Fibre Channel Connections and Cables 38
Connecting the System to Xserve or a Power Mac G4 39
Connecting Xserve RAID to a Switch or Hub 40
Removing Cables From the Xserve RAID and Host Systems 41
Connecting to a Network 42
Connecting Power to the System 43
Connecting an Uninterruptible Power Supply 44
5 Using the Xserve RAID System 45
Starting Up the System 45
Turning Off the System 46
Using Status Lights and Other Indicators 46
If the System Has a Problem 48
6 Installing or Replacing Components 49
About Replacing Components 49
Installing or Replacing an Apple Drive Module 49
Replacing a Power Supply 51
Replacing a Cooling Module 52
Replacing a RAID Controller Module 54
Installing or Replacing a Battery Module 55
Obtaining Additional Replacement Components 56
Contents
4
7 RAID Overview 57
Setting Up the Xserve RAID System 57
Installing Xserve RAID Hardware and Software 57
About RAID Storage 58
How RAID Works 58
Data Storage Methods 59
RAID Levels 60
Hardware and Software RAID 61
What’s Next? 62
8 Planning RAID Storage
for the Xserve RAID System 63
Tools for Configuring the Xserve RAID System 63
RAID Controllers and Drive Modules 64
Xserve RAID Schemes 66
A System With Four Drive Modules 66
A System With Seven Drive Modules 70
A System With 14 Drive Modules 73
Storage Capacities for Xserve RAID Schemes 78
Xserve RAID Hardware Connections 79
Connecting a Four-Drive System to a Host Computer or Switch 80
Connecting a Seven-Drive System to a Host Computer or Switch 80
Connecting a 14-Drive System to a Host Computer or Switch 80
Contents
5
Glossary 81
Appendix A
Specifications 83
RAID Controller Specifications 83
Fibre Channel PCI Card Specifications 83
Apple Drive Module Specifications 84
Dimensions and Operating Environment 84
Ethernet Specifications 84
UPS Interface Specifications 84
Power Supply Specifications 86
Cooling Module Specifications 86
Battery Module (Optional) Information 86
Appendix B
Safety, Maintenance, and Ergonomics 87
Important Safety Information 87
Handling Your System 88
Power Supply 88
Cleaning Your Equipment 88
Apple and the Environment 89
Health-Related Information About Computer Use 89
Communications Regulation Information 91
High-Risk Activities Warning 91
Contents
6
PREFACE
About This Guide
Congratulations on purchasing Xserve RAID, a breakthrough storage solution that delivers
superior capacity, performance, and data protection.
This guide contains instructions for installing the Xserve RAID system in a rack and
exchanging components, as well as an introduction to RAID (redundant array of independent
disks) technology and a guide to planning storage with your Xserve RAID system.
If you are new to RAID, this guide will help you become familiar with this technology and the
ways you can use it to increase the performance and reliability of your data storage.
If you are already familiar with RAID, use this guide as a reference for implementing your
storage strategy with Xserve RAID.
For details of hardware installation, setup, and component exchange, see
m
Chapter 1, “Introducing Xserve RAID,” on page 9
m
Chapter 2, “Preparing to Install Xserve RAID in a Rack,” on page 19
m
Chapter 3, “Mounting Xserve RAID in a Rack,” on page 23
m
Chapter 4, “Connecting Xserve RAID to a Host System and a Network,” on page 37
m
Chapter 5, “Using the Xserve RAID System,” on page 45
m
Chapter 6, “Installing or Replacing Components,” on page 49
For explanations of RAID levels and their implementation on the Xserve RAID system, see
m
Chapter 7, “RAID Overview,” on page 57
m
Chapter 8, “Planning RAID Storage for the Xserve RAID System,” on page 63
In addition, see the procedural instructions in the document “Using RAID Admin to Manage
the Xserve RAID System,” which is included on the CD that came with your system.
7
CHAPTER
1
Introducing Xserve RAID
1
Your new Xserve RAID storage system provides high availability and scalable capacity and
performance. Key features of Xserve RAID include
m
3U enclosure (5.25 inches high)
m
rack optimized
m
dual independent RAID controllers, each with a minimum of 128 megabytes (MB) of RAM
cache
m
up to 14 hot-swappable ATA-100 Apple Drive Modules
m
dual hot-swappable power supplies
m
dual AC power connections
m
dual hot-swappable cooling modules
m
dual 2-gigabit (Gb) copper fibre channel ports, supporting point-to-point and switch
fabric connections
m
dual Ethernet ports for remote management of the system
m
dual serial ports for uninterruptible power supply (UPS) communications
m
Mac OS X compatibility (version 10.2.4 or later)
m
PCI host bus adapter card (sold separately) with dual fibre channel connectors for host
system
m
optional dual battery backup for controller cache
m
optional service parts kit
m
optional drive modules
The Xserve RAID system is designed to be mounted in a rack.
Important
rack. Do not attempt to lift or move the system without help from a second person.
Two people are required to unpack, lift, or mount the Xserve RAID system in a
9
Unpacking the System
The Xserve RAID system is shipped in special packaging to facilitate simple and safe removal
from the carton. As noted previously, always work with a second person to lift or move the
system.
Follow the steps below to open the carton and remove the system from its packaging.
Locate a sturdy table, cart, or other flat surface on which to place the system.
1
The destination surface should be as close as possible to the system’s carton.
2
With one person on each side of the carton, remove the four packing clips on each side of
the carton by pulling the plastic tab at the end of each packing clip, then removing it from
the carton.
3
Cut the tape at the bottom of the carton.
Do not cut
open the top
of the box.
The entire top
comes off as
a single piece.
Cut the tape
that is on both
sides on the
bottom of the box.
Remove the four plastic packing clips by
snapping them open and pulling them out.
4
Lift off the top section of the carton and set it aside.
The system is in the lower part of the carton, beneath two smaller boxes.
Chapter 1
10
Remove the protective foam and the two boxes on top of the system.
T
5
6
Fold back the plastic covering on the unit and fold down the carton at the front and back of
the system.
7
With one person at the front of the system and one at the back, carefully slide your hands
between the system and its plastic cover where there are openings in the supporting foam,
lift the system out of the carton, and put it on the table or other surface.
he unit is heavy. You must have two people
lift it out of the box. With one person at
each end, slide your hands underneath
the unit and over the plastic sheet in
which it is wrapped. Working
together, lift the unit carefully
using your knees,
not your back.
8
Remove the protective film that covers the front of the system.
9
If there is a plastic bracket that covers the center part of the system’s back panel, remove it.
This bracket holds the components securely in place during shipping.
10
Remove the mounting hardware and power cords from the two separate boxes, as well as the
system’s documentation.
11
Write down the system serial number you see on the back panel. Also copy the Ethernet
Media Access Control (MAC) number from the label on each control module (at the top and
bottom in the center of the system). You will need these numbers when setting up and
working with the monitoring and admin software.
Introducing Xserve RAID
11
Your System at a Glance—Front Panel
Drive module
lock and
status light
Power supply
status light
System identifier
button and light
Cooling system
status light
Mute button Host activity
Temperature
status light
Controller
status light
lights
Fibre channel
link lights
Drive module
activity and
status lights
Drive
modules
Chapter 1
12
Drive module lock and lock status light
The lock secures the drive modules in the system. It can be locked and unlocked with the
enclosure key supplied with the system (or a 3 mm. hex key).
System identifier button and light
The system identifier light turns on if a problem is detected. You can also turn it on
manually by pressing the button. This indicator is useful for locating a particular unit in a
rack with multiple systems. A duplicate is on the back panel. (See “Using Status Lights and
Other Indicators” on page 46 for more information.)
Mute button
—
Press to turn off the audible alarm that signals an error condition. ( You can also turn off
the alarm using the system’s monitoring and admin software.)
Fibre channel activity lights
Two vertical rows of 23 lights indicate fibre channel activity. (See “Using Status Lights and
Other Indicators” on page 46 for more information.)
Drive module activity and status lights
Each drive module has two lights showing disk activity and drive status. See “Using Status
Lights and Other Indicators” on page 46 for details.
Power supply status light
Indicates power supply operation: green is OK, red is failure. (See “Using Status Lights and
Other Indicators” on page 46 for more information.)
Cooling system status light
Indicates cooling module operation: green is OK, red is failure.
Temperature status light
Indicates temperature status: green is OK, red is failure.
Controller status light
Indicates RAID controller operation: green is OK, red is failure. (See “Using Status Lights
and Other Indicators” on page 46 for more information.)
Fibre channel link lights
Two lights indicate that a fibre channel connection is active for each RAID controller.
Drive modules
You can install up to 14 drive modules, in two groups of 7 modules each. You can remove
and install these modules while the system is running. (See “Installing or Replacing an
Apple Drive Module” on page 49 for more information.)
Introducing Xserve RAID
13
Your System at a Glance—Back Panel
System identifier
button and light
Optional battery
module bay (2)
Power supply
status lights
Power supply (2)
Power socket (2)
RAID controller module
and status light (2) Cooling module (2) UPS interface port (2)
Mute
button
Controller
status light
RAID
controller
reset
button
Cooling module
status light
Fibre channel
port and status
Power
button
and light
Ethernet port
and status
light (2)
light (2)
Chapter 1
14
System identifier button and light
The system identifier light turns on if a problem is detected. You can also turn it on
manually by pressing the button. This indicator is useful for locating a particular unit in a
rack with multiple systems. A duplicate system identifier button and light are on the front
panel. (See “Using Status Lights and Other Indicators” on page 46 for more information.)
Mute button
—
Press to turn off the audible alarm that signals an error condition. ( You can also turn off
the alarm using the system’s monitoring and admin software.)
RAID controller card, status lights, and reset button
The top controller manages the seven drive modules on the left side of the system (when
facing the unit); the bottom controller manages the seven drive modules on the right. Use
the reset button to restore the factory settings.
Cooling module and status light
A redundant, hot-swappable cooling module cools the system.
Power button and light
®
Press to turn on the system.
Battery module bay and cover
You can install optional battery modules to protect data in each RAID controller’s cache. A
cover protects the two battery spaces if battery modules are not installed.
Power supply and status lights
A redundant, hot-swappable power supply provides power for the entire system. (See
“Using Status Lights and Other Indicators” on page 46 for more information.)
Ethernet port and status light
G
Use the Ethernet port to connect to a network and manage the system remotely.
Power socket (in each power supply)
Connect the power cord here. The cord is held in place by a special clip.
UPS interface port
Connect an uninterruptible power supply (UPS) to this port.
Fibre channel port and status light
Use this port to connect each group of seven drive modules to a host bus adapter card
located in a server or desktop system using a fibre channel cable.
Introducing Xserve RAID
15
Your System at a Glance—Mounting Hardware
C
E
D
Mounting template
Shoulder bolts (6 + extras)
(M5 x 14mm)
Front mounting screws (2)
Long screws (8 + extras)
(10-32 x 3/4")
B
Short screws (6 + extras)
(M5 x 6mm)
Washers (6 + extras)
(M5 x 1mm)
A2
A1
Rear securing screws (2)
Long screws (8 + extras)
(M6 x 20mm)
Nuts (6 + extras)
(M5 x 4mm)
Cage nuts + extras (if needed)
Chapter 1
16
(M6)
Hex key wrench
(5mm)
Enclosure key
(for security lock on front panel)
L-shaped brackets (A1 and A2)
Two large L-shaped brackets attach to the front of the four-post rack and support the
system.
Bracket extenders for a 24- to 29-inch rack (B)
These extenders attach to the brackets A1 and A2 and to the rear rail of the standard fourpost rack.
Bracket extenders for a 29- to 36-inch rack (C and D)
Connect these two extenders and attach them to the brackets A1 and A2 and to the rear
rail of the deep four-post rack.
Solid bar for connecting bracket extension pieces (E)
Use this bar to fasten extenders C and D for a deep rack.
Screws, nuts, washers, and hex key wrench for mounting the system
Use this hardware to secure the system to the rack and to connect the bracket extenders.
See “Assemble the Brackets and Extenders” on page 27 for more information.
Mounting template
Use this template to help mount the brackets squarely to the rack. See “Assemble the
Brackets and Extenders” on page 27 for more information.
Introducing Xserve RAID
17
CHAPTER
2
Preparing to Install Xserve RAID
2
in a Rack
Before you install the system in a rack, carefully consider the placement of the unit in its rack
and several other factors in the infrastructure that will keep the system operating efficiently.
Guidelines for Installation
To ensure safe and smooth operation of your Xserve RAID system, it’s essential that you
choose an appropriate location for the system in its rack, and provide an appropriate
operating environment and adequate power for all components in the rack. In addition, the
system requires special handling because of its weight.
As you plan for installation, follow these guidelines to ensure that the system and its
environment are safely and appropriately positioned for efficient operation and service.
Precautions for Handling the System
When configured with a full set of drive modules, the system weighs approximately 100
pounds. Take the following precautions to avoid problems or potential injury as you handle
the Xserve RAID system.
m
Never try to unpack, lift, or carry the system by yourself. Always have another person
available to help move or lift it.
m Prepare a flat, sturdy surface before removing the system from its packaging. The table or
cart that will hold the system should be as close as possible to the system’s carton.
m Both people should follow these guidelines to lift or move the system:
m Stand with your legs shoulder-width apart to maintain balance.
m Breathe deeply and tighten your stomach muscles to increase support for lifting.
m Bend at your hips and knees, not at your waist.
m Use your leg muscles to lift.
19
m Lift with a smooth motion; don’t jerk the load up or down.
m Keep the system close to your body and at waist level to lessen the load on your back.
m Maintain body alignment while lifting, so that your back, ears, shoulders, and hips are
in line and your eyes and feet are facing the system.
m To turn while holding the system, use your feet; don’t twist your back or torso.
Choosing the System’s Location in the Rack
The Xserve RAID system is designed for use in a four-post rack or cabinet. The rack must be
19 inches wide; it can vary in depth from 24 to 36 inches.
Important Do not try to install an Xserve RAID system in a two-post, or telco-style, rack.
The system cannot be mounted safely in a two-post rack.
When determining where to place the system in a four-post rack, keep the following points
in mind:
m Because of the system’s weight, you may want to install it at or below the middle of the
rack.
m Measure the height needed in the rack (3U, or 5.25 inches at minimum).
m Also measure the depth of the rack and the distance between the back panel of the
system and the rear rail of the rack. This measurement will help you determine which of
the bracket extenders to use when mounting the system in the rack.
m Air to cool the system flows from front to back. Be sure not to cover any of the ventilation
holes in the front or back panels of the unit. Consistent airflow is essential to keep the
system operating efficiently.
Remove the clear plastic film that
Do not block
the air flowing
through the unit.
covers the front so that
airflow is not
restricted.
m Allow room at the front and back of the system for service. Leave at least 36 inches clear
in front of the system, so that you can easily swap drive modules and remove the system
from the rack if necessary. Leave 24 to 30 inches clear behind the system to install or
exchange components.
20 Chapter 2
m For a rack that has multiple devices, you may want to prepare a list of all equipment in the
rack and the requirements for each unit. Such a list should include the following
information:
Power
Component
Xserve RAID
Server 1
Server 2
Managing Cables
needed
Clear area
front / back
Height
in rack
Temperature
range Other
Your Xserve RAID system uses three to six cables and two power cords. It’s a good idea to
determine how these cables and cords will be arranged at the rear of the system and where
the cables will be routed to connect to a host system. See “Connecting Xserve RAID to a Host
System or Switch” on page 38 for details about connecting cables.
Rack Stability
The rack must be stable and strong enough to hold the Xserve RAID system and the other
devices installed.
m Check the documentation for the rack to make certain that it can support all its
components.
Important Do not exceed the weight limit recommended for your rack.
m Make certain that all components are secured in the rack.
m When installing the system in a cabinet that has casters, verify that you can secure the
casters to keep the cabinet from moving as you mount the system. If the cabinet does not
have a brake, make sure you can place the back of the cabinet against a wall as you install
the system at the front.
Electrical Power
If you plan to install the system in a rack that contains other components, be sure that the
circuitry and power connections are sufficient for the combined power needs of all
components. To plan for safe and adequate power to the system, follow these guidelines:
m Check the documentation for all components in the rack to determine their power
requirements. Then make sure that the available power supply for the rack is sufficient for
the planned components.
m If you need assistance determining the power needs of the components in the rack,
consult an electrical expert who is familiar with your facility.
Preparing to Install Xserve RAID in a Rack 21
m If there are devices in the system’s location that use large amounts of power, use surge
protectors or power conditions as part of the installation.
Important When planning for electrical power, make sure you have more power than
the total power requirements specified for all components. Also make certain that the
power load is distributed evenly among circuits to the rack’s location. Consult an
electrician or other expert if you need assistance with planning for the power needs of
your components.
m Make sure that the power connections for the system and all other components are
grounded (according to local and national standards). Consult an electrician if you need
assistance with grounding.
m See Appendix A, “Specifications,” on page 83 for more information about electrical power
requirements for the system.
Operating Environment
The operating environment for the system’s rack must meet certain requirements:
m Verify that the temperature range of the rack’s location is within the limits established for
the system and all other components.
m Make certain that the rack’s location has adequate ventilation to maintain the necessary
temperature range. This is particularly important for a rack that is enclosed in a cabinet.
m If multiple components are installed in the rack, consider additional cooling to assure
efficient operation of the system and other equipment.
Security
To ensure the security of the system and rack, note the following:
m Determine that the rack’s location is secure and that only authorized staff members or
technicians can gain access to this location.
m If using a cabinet that is not stored in a secure room, be sure that the cabinet can be
locked securely and that access to it is limited to authorized staff.
m Develop a plan for distributing and controlling keys to the rack’s location and access
codes that will allow others to manage the system over the network. Keep the plan
updated with names of key staff and relevant emergency information and procedures.
m Store a copy of essential system access information in a safe place away from the system’s
location.
m Store the Xserve RAID documentation and related materials in a central location and
inform key staff of that location. Also post electronic documents on network locations to
which users of the system will have access.
22 Chapter 2
CHAPTER
3
3 Mounting Xserve RAID in a Rack
The Xserve RAID system is specifically designed for rack mounting. It is not designed for use
as a desktop system. You can install the system in a four-post cabinet or rack that is 19 inches
wide and between 24 and 36 inches deep. The system is 5.25 inches (3U) high.
Four-post cabinet rack
Four-post open rack
23
The brackets and screws necessary to attach the system to a four-post rack with threaded
holes are included with your system. If your rack has square, unthreaded holes, you may
need to insert cage nuts (some are provided with the system) into the appropriate holes
before attaching the system to the rack.
Some racks have
pre-threaded holes.
Important Any rack used for Xserve RAID should meet the specifications of the American
Other racks use various
types of removable
cage nuts to secure
equipment.
National Standards Institute (ANSI)/Electronic Industries Alliance (EIA) standard ANSI/EIA310-D-92, International Electrotechnical Commission (IEC) 297, and Deutsche Industrie
Norm (DIN) 41494. See the documentation for the rack to determine whether it is
compatible with these standards.
Getting Ready to Install the System
Before working with the system, mounting hardware, and rack, make the following
preparations.
Important Check the rack’s documentation for any special requirements.
m Arrange to work with another person as you prepare the system and install it in a rack.
m Assemble the tools, brackets, and fasteners you’ll need for the installation. (All except the
screwdriver and pliers or wrench are provided with the system.) You will need
m a medium-sized Phillips screwdriver. If you have a power screwdriver, use it.
m a pair of pliers or a small wrench
m the large L-shaped brackets and (depending on the depth of your rack) one or two
bracket extenders
m the hardware supplied with the system to assemble the extenders and secure the
system to the rack. See “Assemble the Brackets and Extenders” on page 27 for details.
24 Chapter 3
Note: Several sets of screws are provided with the system. These screws are designed for
racks with prethreaded holes. Check the documentation for your rack and use the
appropriate set of screws; most racks use one of the sizes. If screws are provided with your
rack, you can use those as well.
m To measure and mark the position of the system in the rack, you can use the metal
mounting template that came with the system. You can also use a pen or pencil and some
masking tape or similar tape to mark the position on the rack.
m Clear a table, cart, or other flat surface near the rack. You’ll need to put the system on it
temporarily during installation, and you can use it to lay out the brackets and screws you’ll
use to attach the system to the rack.
Determine the Position for the System in the Rack
Review the guidelines for positioning the system in the rack (see “Choosing the System’s
Location in the Rack” on page 20). Then follow these steps to measure and mark a specific
location.
1 Determine the exact position where you want to attach the bottom edge of the system and
mark it on one side of the rack. To be sure there is room for the system at this position in the
rack, the space available must be at least 5.25 inches from bottom to top.
The distance between holes may vary somewhat on racks made by different manufacturers.
2 Use the template included with the system to mark the same spot on the other side of the
rack.
3 Measure the depth of the rack.
m If your rack is 24 to 29 inches deep, use brackets A1 and A2 and the medium-length
extenders with a three-hole lip at one end (item B in the illustration below).
B
Short screws
Mounting template
Mounting Xserve RAID in a Rack 25
A1 and A2
m If your rack is 29 to 36 inches deep, combine the shorter extender with a three-hole lip at
the one end (item C in the illustration below) and the longest piece (with no lip; item D
in the illustration), using the solid bar (item E in the illustration). This combination
creates an extender long enough to reach the rear of a deep rack.
C
E
D
Mounting template
A1 and A2
Short screwsNutsWashersShoulder bolts
For a rack exactly 29 inches deep, try the A and B combination of bracket and extender; if
that does not fit, use the A, C, D, and E combination.
Prepare the System for Installation
Follow these steps to prepare the system hardware for installation.
1 With a second person, unpack the system from its carton and place it on the table or cart.
Follow the instructions in “Unpacking the System” on page 10.
2 Write down the serial number on the system’s back panel and the two Ethernet MAC
numbers on the RAID controller modules (at the center of the back panel).
You will need these numbers when you set up and use the Xserve RAID software.
Installing the System
To install the system in the rack, you
m assemble the brackets
m attach the brackets to the rack
m rest the system on the brackets and secure it to the rack
26 Chapter 3
Assemble the Brackets and Extenders
Follow these steps to assemble the brackets and extenders for the depth of your rack.
For a Rack 24 to 29 Inches Deep
1 Gather the two large brackets (items A1 and A2) and the two longer extenders (item B in the
illustration below), along with the necessary screws:
m six short screws for assembling two brackets and extenders
m four long screws for securing the brackets to the rack
m two mounting screws for attaching the system to the rack
B
Short screws
Mounting template
A1 and A2
2 Place the cut-out area of the extender (B) over the three posts that extend from the wider
side of the bracket A.
B
Pass three of the short
screws through the slot in part B and
attach them to part A1 or A2. Tighten them securely.
Make sure part B fits under the tabs on part A1 or A2.
A1 or A2
3 Fasten the bracket and extender together using three short screws and tighten the screws.
Note that you can still slide the extender backward and forward.
Mounting Xserve RAID in a Rack 27
4 Fit the assembled pieces into the rack so that the extender’s lip is near the rear rail and the
lip of bracket A points toward the outer edge of the rack at the front rail.
Adjust the mounting
bracket assemblies to fit the rack.
The flanges at both ends should
be on the outside of the rack posts.
The orientation of bracket A determines on which side of the rack it belongs. The lower part
of this L-shaped bracket faces inward (to support the system). The posts on the upper part of
the bracket face outward and the extender is on the outside of the bracket. (In the
illustration, bracket A1 goes on the left as you face the rack; A2 goes on the right of the
system.)
5 Hold one of the A brackets against one rail on the front of the rack at the position you
marked, then place the metal template over the post on the front of the bracket.
6 Have the other person hold the second A bracket at the position marked on the other front
rail and place the metal template over the post on the front of the second bracket.
Important The brackets must be attached to the rails at a 90-degree angle to ensure that
the Xserve RAID system is mounted securely. Use the template to guide you in attaching the
brackets correctly.
Temporarily place the mounting template over the two posts on parts A1 and A2.
Attach each bracket assembly to the front
rack post with two of the screws provided.
Tighten the screws and then remove the template.
28 Chapter 3
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