HP COMPAQ PROLIANT 1000 SERVER, COMPAQ PROLIANT 2000 SERVER User Manual
ONLINE STORAGE
CONTROLLER RECOVERY
OPTION
USER GUIDE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Online Storage Controller
Recovery Option
User Guide
First Edition (September 1997)
Part Number
Compaq Computer Corporation
295586-001
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Notice
The information in this publication is subject to change without notice.
COMPAQ COMPUTER CORPORATION SHALL NOT BE LIABLE FOR TECHNICAL OR
EDITORIAL ERRORS OR OMISSIONS CONTAINED HEREIN, NOR FOR INCIDENTAL OR
CONSEQUENTIAL DAMAGES RESULTING FROM THE FURNISHING, PERFORMANCE, OR
USE OF THIS MATERIAL. THIS INFORMATION IS PROVIDED “AS IS” AND COMPAQ
COMPUTER CORPORATION DISCLAIMS ANY WARRANTIES, EXPRESS, IMPLIED OR
STATUTORY AND EXPRESSLY DISCLAIMS THE IMPLIED WARRANTIES OF
MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE, GOOD TITLE AND AGAINST
INFRINGEMENT.
This publication contains information protected by copyright. No part of this publication may be
photocopied or reproduced in any form without prior written consent from Compaq Computer
Corporation.
1997 Compaq Computer Corporation.
All rights reserved. Printed in the U.S.A.
The software described in this guide is furnished under a license agreement or nondisclosure agreement.
The software may be used or copied only in accordance with the terms of the agreement.
This publication does not constitute an endorsement of the product or products that were tested. The
configuration or configurations tested or described may or may not be the only available solution. This
test is not a determination of product quality or correctness, nor does it ensure compliance with any
federal, state, or local requirements. Compaq does not warrant products other than its own strictly as
stated in Compaq product warranties.
Compaq, SMART-2, ProLiant, and NetFlex are registered with the United States Patent and Trademark
Office.
Netelligent and ProSignia are trademarks and/or service marks of Compaq Computer Corporation.
Microsoft, Windows, and Windows NT are registered trademarks of Microsoft Corporation.
Product names mentioned herein may be trademarks and/or registered trademarks of their respective
companies.
Online Storage Controller Recovery Option User Guide
First Edition (September 1997)
Part Number 295586-001
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iii
Contents
How To Use This Guide
How this Guide is Arranged.......................................................................................... vii
Symbols In Text............................................................................................................ viii
Symbols in Equipment ....................................................................................................ix
Getting Help ....................................................................................................................xi
Telephone Numbers .................................................................................................xi
Compaq Web Site.................................................................................................. xiii
Chapter 1
Elements of the Online Storage Controller Recovery Option Solution
Hardware Requirements............................................................................................... 1-1
Software Requirements ................................................................................................ 1-2
Kit Contents..................................................................................................................1-3
Chapter 2
Functionality and Configuration Options
Redundancy at the Mass Storage Controller Level...................................................... 2-1
Merging two SMART-2 Controllers into a Controlled Pair ........................................ 2-2
Configuration Options.................................................................................................. 2-4
Single-Channel Configuration .............................................................................. 2-6
Dual-Channel Configuration................................................................................. 2-8
Multiple Controller Pairs....................................................................................... 2-9
Internal vs. External Boot Device....................................................................... 2-10
Online Storage Controller Recovery Option User Guide
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iv
Chapter 3
Planning and Installing the Online Storage Controller Recovery Option
Hardware Planning....................................................................................................... 3-1
Controllers for OSCRO Implementation .............................................................. 3-1
Dual-Channel Configuration Considerations........................................................3-2
Knockout Panels.................................................................................................... 3-2
OSCRO Planning Implications..................................................................................... 3-3
Potential Impact on Unattended Reboot ............................................................... 3-4
Boot Device Configuration Planning.................................................................... 3-4
Array Acceleration Disabled.................................................................................3-5
Recovery Server Option Incompatibility.............................................................. 3-5
Setting Up for OSCRO Installation..............................................................................3-5
Installing the Recovery Server Switch in the ProLiant Storage System/F or /U.. 3-6
Upgrading the SMART-2 Array Controller Firmware .........................................3-9
Updating the SMART-2 Array Controller Device Drivers................................. 3-10
Loading the Compaq SSD for Windows NT ...................................................... 3-10
Installation.................................................................................................................. 3-13
Installing the Controllers.....................................................................................3-14
Labeling the Cables.............................................................................................3-15
Connecting the Cables......................................................................................... 3-16
Merging Two Controllers into a Controller Pair................................................. 3-20
Testing and Verifying the Installation........................................................................3-22
Chapter 4
Compaq Online Storage Controller Recovery Utility
Major Functions............................................................................................................ 4-1
Right-Click Functionality.............................................................................................4-2
Mass Storage Controller Icons .....................................................................................4-3
Viewing Device Properties...........................................................................................4-6
Setting Machine Options............................................................................................ 4-10
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Chapter 5
Troubleshooting
Controllers Must Be Matched ...................................................................................... 5-1
Planning for OSCRO when RSO is in Use .................................................................. 5-1
Incorrect Cabling.......................................................................................................... 5-1
Cross Connection .................................................................................................. 5-2
Unilateral Connection ........................................................................................... 5-4
Mismatched Controller Pairs................................................................................. 5-6
Clearing a Cable Check Error....................................................................................... 5-7
Verify Does Not Switch Back...................................................................................... 5-7
Wrong Device Driver ...................................................................................................5-7
Controller Not Seen on the Online Storage Controller Recovery Utility ....................5-7
Boot Device Considerations......................................................................................... 5-8
Chapter 6
Recovering from Mass Storage Controller Failure
Recovering from Mass Storage Controller Failure Using PCI Hot Plug
Technology................................................................................................................... 6-1
Recovering from Mass Storage Controller Failure Without PCI Hot Plug
Technology................................................................................................................... 6-3
Boot Device Considerations......................................................................................... 6-3
v
Chapter 7
Dissolving a Controller Pair.........................................................................
Appendix A
Electrostatic Discharge
Preventing Electrostatic Damage ............................................................................... A-1
Grounding Methods....................................................................................................A-1
Online Storage Controller Recovery Option User Guide
7-1
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vi
Appendix B
Regulatory Compliance Notices
Class A Equipment......................................................................................................B-1
Modifications........................................................................................................B-1
Cables................................................................................................................... B-1
Canadian Notice (Avis Canadien)...............................................................................B-1
Class A Equipment...............................................................................................B-1
European Union Notice................................................................................................B-2
Japanese Notice ...........................................................................................................B-3
Australian Notice.........................................................................................................B-3
Appendix C
Building Diskettes from the SmartStart and Support Software CD
Building Diskettes for the SMART-2 Array Controller Firmware Upgrade..............C-1
Building Diskettes for the Compaq System Configuration Utility
version 2.36 rev. A ......................................................................................................C-4
Index
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vii
How To Use This Guide
This guide provides procedures for configuring, installing, maintaining, and
supporting the Online Storage Controller Recovery Option (OSCRO). It is
designed to be a reference for implementing and troubleshooting OSCRO
configurations. The other high-availability options in the Recovery Server
Option/F kit, Standby Recovery Server and On-Line Recovery Server, are covered
in the Recovery Server Option User Guide (part number 213818-004), which is
also in the kit.
How this Guide is Arranged
The manual is divided into the following chapters:
■ Chapter 1 - Elements of the Online Storage Controller Recovery
Option Solution
This section covers the hardware and software requirements of the
Online Storage Controller Recovery Option and provides a breakdown
of the contents of the kit.
■ Chapter 2 - Functionality and Configuration Options
This section describes the basic functionality and benefits of OSCRO
and details configuration options.
■ Chapter 3 - Planning and Installing the Online Storage Controller
Recovery Option
This section provides step-by-step instructions for planning and
installing OSCRO.
■ Chapter 4 - Compaq Online Storage Recovery Utility
This section describes the use of the Compaq Online Storage Controller
Recovery Utility.
■ Chapter 5 - Troubleshooting
This section describes error conditions and incorrect configurations of
OSCRO.
■ Chapter 6 - Recovery from Mass Storage Controller Failure
This section details recovery procedures to be used when a mass storage
controller fails under OSCRO.
■ Chapter 7 - Dissolving a Controller Pair
This section explains how and when to dissolve a controller pair.
Online Storage Controller Recovery Option User Guide
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viii How To Use This Guide
■ Appendixes include important information related to electrostatic
discharge, regulatory compliance notices, and how to build diskettes
from the SmartStart and Support Software CD.
Symbols In Text
WARNING: Text set off in this manner indicates that failure to follow
directions in the warning can result in bodily harm or loss of life.
CAUTION: Text set off in this manner indicates that failure to follow
directions can result in damage to equipment or loss of information.
IMPORTANT: Text set off in this manner presents clarifying information or specific
instructions.
NOTE: Text set off in this manner presents commentary, sidelights, or interesting
points of information.
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ix
Text Conventions
Convention Use
Keys
USER INPUT User input appears in a different typeface
Keys appear in boldface. A plus sign (+)
between two keys indicates that they
should be pressed simultaneously.
and in uppercase
FILENAMES
Menu Options, Command Names,
Dialog Box Names
COMMANDS, DIRECTORY NAMES,
and DRIVE NAMES
Type When you are instructed
Enter When you are instructed
Symbols in Equipment
WARNING: Any surface or area of the equipment marked with
these symbols indicates the presence of a hot surface or hot
component. If this surface is contacted, the potential for injury
exists. To reduce the risk of injury from a hot component, allow the
surface to cool before touching.
File names appear in uppercase italics
These appear in initial capital letters
These always appear in uppercase
to type
information, type the information
pressing the
information, type the information and
then press the
Enter
Enter
key
key
without
to enter
Online Storage Controller Recovery Option User Guide
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x How To Use This Guide
WARNING: Any surface or area of the equipment marked with
these symbols indicates the presence of electrical shock hazards.
Enclosed area contains no operator-serviceable parts. To reduce
the risk of injury from electrical shock hazards, do not open this
enclosure.
WARNING: Any RJ-45 receptacle marked with these symbols
indicates a Network Interface Connection. To reduce the risk of
electrical shock, fire, or damage to the equipment, do not plug
telephones or telecommunications connectors into this receptacle.
WARNING: Some products are equipped with a three-wire, electrical
grounding-type plug that has a third pin for grounding. This plug only fits
into a grounded electrical outlet. This is a safety feature. Do not defeat the
safety purpose of the grounding-type plug by trying to insert it into a nongrounded outlet. If you cannot insert the plug into the outlet, contact your
electrician to replace the obsolete outlet.
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A
A
A
A
xi
Getting Help
If you have a problem and have exhausted the information in this guide, you
can get further information and other help in the following locations.
Telephone Numbers
Contact your nearest Compaq Authorized Reseller or Service Provider for more
information.
■ For the name of your nearest Compaq Authorized Reseller:
❏ In the United States, call 1-800-345-1518
❏ In Canada, call 1-800-263-5868
■ For Compaq technical support:
❏ In the United States and Canada, call 1-800-386-2172
❏ Elsewhere, call one of the numbers listed below
Compaq Worldwide Technical Support Telephone Numbers
Location Voice FAX
PD 65-7503030 65-7504909
rgentina 54-1 313 3100 54-1 313 3100 Ext 21
ustralia 61-2-9911-1955 61-2-9911-1900
ustria 0222-87816-16 0222-87816-82
Bahrain 973-210-214
Belgium (02) 716-96-96 (02) 725-22-13
Brazil 55 11 5505-3600 55 11 5505-3922 Ext 4336
Canada 1-800-386-2172
Caribbean 1-800-345-1518
Central America 713-378-2206
Continued
Online Storage Controller Recovery Option User Guide
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xii How To Use This Guide
Compaq Worldwide Technical Support Telephone Numbers
Location Voice FAX
Chile 562-274-3007
China 86-10-834-6721 86-10-834-6713
Colombia 571-345-0266 571-312-0157
Czech Republic 42-2-232-8772 42-2-232-8773
Denmark 45-90-4545 45-90-4595
Ecuador 593-2504540
Europe/Middle East/Africa (49) 089-9933-2891
Finland 9800-206-720
(358-800-1-206720)
France (33 1) 41-33-4455 (33 1) 41-33-4263
Germany 0180-5-212111 089-9933-3399
Hong Kong 852-90116633 852-28671734
Hungary 36-1-201-8776 36-1-201-9696
India (91-80) 559-6023
Italy 392-57-90300 392-575-00686
Japan 0120-101589 81 3-5402-5959
Korea 82-2-523-3575 82-2-3471-0321
Malaysia (603) 718-1636
Mexico (525) 229-7910 (525) 229-7988
Netherlands 06-91681616 06-8991116
New Zealand 649-307-3969
Norway 22-072-020 22-072-021
Poland 48-2-630-3535 48-2-630-3553
Portugal 351-1-4120132 351-1-4120654
Singapore 65-7503030 65-7504909
South Africa 27-11-728-6999 27-11-728-3335
Spain 341-640-1302 341-640-0124
Sweden (46) 8 703 5240 (46) 8 703 5222
Switzerland 411 838 410/2222 01-837-0969
Taiwan (886) 2-3761170 (886) 2-7322660
Thailand 62-2-679-6222 62-2-679-6220
United Kingdom 44-81-332-3888 44-81-332-3409
United States 1-800-386-2172 1-800-345-1518
Venezuela (582) 953.69.44 (582) 952.86.70
Continued
90-6155-9899
(358-0-61559899
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xiii
Compaq Web Site
The Compaq Web site has information on this product as well as the latest
drivers and Flash ROM images. You can access the Compaq Web site by
logging on to the Internet at http://www.compaq.com.
OSCRO Suggestions and Comments
For suggestions and comments about OSCRO, please send e-mail to:
CompaqNT@compaq.com
using OSCRO in the Subject line.
We regret we are unable to respond individually to e-mail suggestions.
Please do not send support questions to this address.
Online Storage Controller Recovery Option User Guide
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1-1
Chapter 1
Elements of the Online Storage
Controller Recovery Option
Solution
The Online Storage Controller Recovery Option (OSCRO), which is a part of
the Recovery Server Option kit, includes hardware and software elements, and
requires careful configuration and setup. You must understand what can and
cannot be done with existing hardware and the other options in the Recovery
Server Option /U kit.
There are three high-availability option solutions in the Recovery Server
Option /U kit. They are:
Standby Recovery Server
■
On-Line Recovery Server
■
Online Storage Controller Recovery Option
■
If you want to install either the Standby Recovery Server or the On-Line
Recovery Server option, please direct your attention to the
Option User Guide
(part number 213818-004).
Recovery Server
Hardware Requirements
The following hardware components are required for OSCRO:
Compaq ProLiant or ProSignia server
■
For some server models, a knockout panel
■
Two Compaq SMART-2 Array Controllers of the same type
■
Compaq ProLiant Storage System(s)/F or /U
■
Fast-Wide SCSI cables (either 6 or 12 feet in length) to connect
■
SMART-2 controllers to the ProLiant Storage System(s)/F or /U
Recovery Server Switch
■
Online Storage Controller Recovery Option User Guide
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1-2
Elements of the Online Storage Recovery Option Solution
NOTE: OSCRO is supported for the single bus versions of the ProLiant Storage
System/F and /U units, in both the tower and rack-mount configurations. Older
ProLiant Storage Systems and duplex versions of the ProLiant Storage System are
not supported by OSCRO. The ProLiant Storage System/F and /U units that are and
are not supported are pictured in Figure 1-1.
Not
Supported
US Part Number 146700
189600
Intl. Part Number 146750
Figure 1-1.
197100
189640
197150
Compaq ProLiant Storage Systems
Software Requirements
OSCRO is supported only under Windows NT 4.0.
All software required to implement OSCRO is on the Compaq SmartStart and
Support Software CD included in the kit. This CD includes the Compaq Support
Software for Microsoft Windows NT (SSD) (version 2.02 or later) and updated
firmware and device drivers for the Compaq SMART-2 Array Controllers. For
instructions on how to build diskettes from the CD, see Appendix C “Building
Diskettes from the SmartStart and Support Software CD.”
US Part Number 272800
272900
304100-B21
304110-B21
Intl. Part Number 272804
272904
304104-B31
304114-B31
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1-3
The Compaq SSD for Windows NT includes the following elements required to
implement OSCRO:
Compaq Online Storage Controller Recovery Utility
■
Updated Compaq SMART-2 Array Controller device driver
■
(CPQARRAY.SYS)
■
■
OSCRO also requires installation of the Remote Procedure Call (RPC)
Service, which is part of the Windows NT operating system. If OSCRO is
also to be used to manage remote servers, you need to install a routable
protocol that supports RPC (such as TCP/IP).
The ROMPaq for the SMART-2 firmware upgrade (version 1.94 or later) is
included on the SmartStart and Support Software CD in the Recovery Server
Option /U kit. It can also be found on the Compaq Web site.
Kit Contents
The Recovery Server Option /U kit (part number 304117-B21) includes
hardware and software required for implementation of OSCRO and some
additional parts (that would be used if you were installing either the Standby
Recovery Server or On-Line Recovery Server option).
Check Figure 1-2 to verify that you have all of the necessary items for OSCRO
implementation. The items in the kit that relate to OSCRO are:
■
■
Compaq System Management driver
Compaq Remote Monitoring service
(SYSMGMT.SYS)
(CPQRCMC.EXE)
One Recovery Server Switch (part number 007678-001)
One Knockout Panel Assembly (part number 189620-001)
One External Fast-Wide SCSI Cable (part number 189646-003)
■
Compaq SmartStart and Support Software CD (part number 196268-
■
001), which includes all of the software and drivers required for the
Online Storage Controller Recovery Option
The
■
Online Storage Controller Recovery Option User Guide
Online Storage Controller Recovery Option User Guide
(this document)
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1-4
Elements of the Online Storage Recovery Option Solution
The contents of the Recovery Server Option /U kit are illustrated in
Figure 1-2. When implementing OSCRO, not all of the parts in the kit will
be needed. Those that are not needed for OSCRO are shaded in the figure.
To implement OSCRO, you may also need one or more additional internal
SCSI ribbon cables (part number 199595-002). These are the original cables
that came with your SMART-2 Array Controllers. If you do not have the
correct cables and you are planning a dual-channel configuration (see
Chapter 2), you also need one or more Spares kits (part number 198639-
001). Spares kits include the required ribbon cable, screws, and screwlocks
required for OSCRO implementation.
Verify that you have all the necessary items before beginning the installation.
196268
007678
189620
213807
Figure 1-2.
189646
Kit Contents (Part Number 304117-B21)
Important
Card
RSO User Guide
OSCRO User Guide
After verifying that you have all the required elements for the OSCRO
implementation you are planning, proceed to Chapter 2 to learn more about
OSCRO.
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2-1
Chapter 2
Functionality and Configuration
Options
There are three high-availability option solutions in the Recovery Server
Option /U kit:
■ Standby Recovery Server
■ On-Line Recovery Server
■ Online Storage Controller Recovery Option (OSCRO)
The first two option solutions minimize server downtime by automatically
transferring operations from a failed server to a backup server.
OSCRO, on the other hand, provides a way to reduce or eliminate downtime
associated with mass storage controller failure. In this chapter, we examine how
OSCRO provides this benefit.
Redundancy at the Mass Storage
Controller Level
In the past, the effort to improve the reliability of I/O subsystems focused on
redundant arrays of independent disks (RAID). RAID protects data if a disk
drive fails but offers no protection against mass storage controller failure.
Windows NT provides the option to implement a fully redundant I/O subsystem
in a configuration called Disk Duplexing. Disk Duplexing implemented at the
software level provides protection against failure of the disk as well as the mass
storage controller. Disk Duplexing requires complete redundancy of all I/O
subsystem components, however, which makes it very costly to implement and
limits the extensibility of the system.
With the introduction of OSCRO and its two-way switching capability,
Compaq offers fault tolerance for mass storage controllers implemented at the
hardware level, providing increased reliability without the need for complete
I/O subsystem redundancy.
Online Storage Controller Recovery Option User Guide
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2-2
Functionality and Configuration Options
Merging two SMART-2 Controllers
into a Controlled Pair
OSCRO allows you to merge two matched SMART-2 controllers into a
controller pair. In such a pair, one controller is active and the other remains
in standby mode. Should a problem occur with the active controller, the
SMART-2 device driver switches traffic to the standby controller without
loss of data or interruption of service (see Figure 2-1).
1
0
1
0
1
0
1
Figure 2-1.
Standby
Active
Device
Driver
A controller pair
is established.
Online Storage Controller Recovery Option Overview
If the active controller fails, the standby
Failed
controller is promoted to active.
Device
Driver
Active
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2-3
Previously, implementing mass storage controller redundancy required
duplication of the mass storage controllers, as well as the disk drives. By
pairing OSCRO with RAID 5 arrays, you gain the benefits of fault tolerance for
the disks and the controllers without the additional costs of complete disk drive
redundancy.
OSCRO extends the reliability of Windows NT servers by ensuring continuing
operation of the system, even when a mass storage controller fails. The Compaq
Online Storage Controller Recovery Utility for Windows NT provides a means
of managing the mass storage controllers of the entire Windows NT network
from a single management station.
OSCRO is a natural partner for Compaq PCI Hot Plug technology. The
combination of the two eliminates the need to shut the system down when a
mass storage controller fails. OSCRO permits the system to continue operating
after a controller failure, and PCI Hot Plug technology allows replacement of
the failed controller without shutting the system down.
Online Storage Controller Recovery Option User Guide
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2-4
Functionality and Configuration Options
Configuration Options
This section outlines the configuration guidelines involved in establishing
highly reliable I/O using OSCRO. Table 2-1 lists the RAID options available
and details the requirements and benefits of each option.
Table 2-1
Configuration Options
Raid
Level
0 No 1 1 0% No Data unavailable
0 Yes 2 1 0% No Data unavailable if
1 No 1 2 50% No Data unavailable if
1 Yes 2 2 50% Yes Complete
5 No 1 3 33% to 7% No Data unavailable if
5 Yes 2 3 33% to 7% Yes Complete
Controller
Pairing
Controllers
Required
Min. # of
Drives
Storage Space
Overhead for
Redundancy
Recommended Comments
if drive or
controller fails.
drive fails.
controller fails.
redundancy, high
overhead.
controller fails.
redundancy,
lowest overhead.
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2-5
SMART-2 Array Controllers implement RAID fault tolerance at the hardware
level, eliminating the overhead associated with implementing RAID in the
software. Another advantage of implementing RAID at the hardware level is
the ability to apply any of the RAID configuration options to the system disk, as
indicated in Table 2-2.
Table 2-2
SMART-2 Array Controller Configuration Options
0 No Fault Tolerance Yes Maximum availability of storage, no
1 Drive Mirroring Yes Half the space given up for RAID overhead;
5 Distributed Data
Yes Lower percentage of space given up to RAID
Guarding
protection of data.
half of the mirror set can fail without data
loss. No system performance overhead, as
write operations are performed by
hardware. Recommended when data
availability is most important.
overhead; one device of the stripe set can
fail without data loss. System performance
may be improved by reducing disk latency.
Recommended when data availability, cost,
and performance are important criteria in I/O
subsystem design.
Using OSCRO with RAID 0 provides protection against failure of a SMART-2
Array Controller, but does not provide any data protection if a disk fails.
Online Storage Controller Recovery Option User Guide
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2-6
Functionality and Configuration Options
The combination of OSCRO and RAID 1 provides all the advantages of
traditional disk duplexing. This combination provides the additional advantage
of implementing all the fault tolerance features at the hardware level, thus
eliminating the overhead associated with implementing fault tolerance in the
software.
Pairing redundant SMART-2 Array Controllers with RAID 5 disk arrays
provides the data protection of the RAID implementation and the fault tolerance
of redundant controllers.
Conceptually, there are two ways to configure an OSCRO implementation:
single channel and dual channel. OSCRO can also be set up in more complex
combinations of single-channel and/or dual-channel configurations.
Single-Channel Configuration
The simplest OSCRO configuration involves two SMART-2 Array Controllers
and a single ProLiant Storage System/F or /U equipped with the Recovery
Server Switch. The Compaq Online Storage Controller Recovery Utility is used
to merge the independent controllers into a controller pair. One controller is the
active controller, and the other is designated the standby controller. Both
controllers are physically wired to the ProLiant Storage System/F or /U through
the Recovery Server Switch, as illustrated in Figure 2-2.
Any two SMART-2 controllers with the same channel count can be used to
form a basic controller pair. When using a single-channel controller, such as the
SMART-2SL, the single-channel configuration is the only feasible OSCRO
configuration.
IMPORTANT:
installed from an earlier version of the Recovery Server Option kit, you must
disable that option, upgrade the Recovery Server Switch in the ProLiant
Storage System/F or /U, and reconfigure the cabling in order to implement
OSCRO. RSO and OSCRO cannot be implemented in the same devices at the
same time.
If you already have the Recovery Server Option (RSO)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-7
ProLiant
Storage
System
1
/F or /U
2
Standby
Figure 2-2.
Active
Device
Driver
Single Controller Pair Configuration -- Logical Diagram
The single-channel configuration provides the foundation for understanding
how to configure OSCRO. Note that in the example shown in Figure 2-2, the
active controller is connected to the primary port on the ProLiant Storage
System.
The active controller should always be connected to the primary port of the
ProLiant Storage System to provide consistent recovery after complete power
loss to the server and the storage system. When the power is cycled on the
ProLiant Storage System, the Recovery Server Switch inside is reset and the
primary port becomes the active port by default. By aligning the primary port of
the ProLiant Storage System with the active controller of the controller pair, the
system recovers from a power failure using the power-up defaults.
Online Storage Controller Recovery Option User Guide
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2-8
Functionality and Configuration Options
This configuration rule is especially significant when the system boot device is
connected to a controller pair. Because the boot device controller is selected
during System Configuration by setting the Controller Order to First, no other
controller can be used to boot the system. Therefore, the boot device controller
must be given default access to the ProLiant Storage System after power is
restored.
Dual-Channel Configuration
Dual-channel SMART-2 Array Controllers are capable of supporting two
ProLiant Storage Systems. A controller pair can support a pair of ProLiant
Storage Systems as long as the cabling is done properly. Figure 2-3 shows a
logical diagram of such a configuration.
When forming dual-channel controller pairs, both controllers must be dualchannel controllers. Do not attempt to use single-channel controllers such as the
SMART-2SL in a dual-channel configuration.
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2-9
Figure 2-3.
ProLiant
Storage
System
1
/F or /U
2
1
Active
Device
Driver
Dual-Channel Controller Pair -- Logical Diagram
1
2
ProLiant
Storage
System
/F or /U
2
Standby
Multiple Controller Pairs
An OSCRO multiple controller pair configuration would be required in an
installation that needs mass storage controller redundancy for more than 14
spindles of data. A controller pair in a multiple controller pair configuration
can be a single-channel or dual-channel pair. The capability to define multiple
controller pairs extends the configurable size of the fault-tolerant I/O
subsystem. With increased flexibility comes an increased need for planning
and care during configuration and installation.
Online Storage Controller Recovery Option User Guide
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