HP A3312AZ, A3311A, A3312A User Manual
HP A3311A/12A/12AZ
High Availability Storage Systems
Installation/Service Manual
HP Part No. A3311-90006
Printed in USA
December 1999
Notice
Copyright © 1999 Hewlett-Packard Company
The information contained in this document is subject to change without notice.
Hewlett-Packard Company 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.
This document contains proprietary information, which 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 consent of Hewlett-Packard.
Typographical Conventions
NOTE! Notes contain important information.
CAUTION! Caution messages indicate procedures which, if not observed, could result in
damage to your equipment or loss of your data.
WARNING! Warning messages indicate procedures or practices which, if not observed,
could result in personal injury.
About this Manual
This manual describes the installation, operation, and service of the HP A3311A deskside, A3312A field
rackmount, and A3312AZ factory rackmount storage systems.
Trademark Credits
TORX hardware is used in this product. TORX hardware requires the use of special drivers. In this
manual, any reference to TORX hardware will be accompanied by the required driver size (for example,
“T-15”).
TORX is a product of the Camcar Division of Textron, Inc.
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Table of Contents
CHAPTER 1. PRODUCT INFORMATION ..................................................................................... 1
PRODUCT OVERVIEW................................................................................................................................. 1
Key Features........................................................................................................................................ 2
High Availability.................................................................................................................................. 2
SCSI Buses........................................................................................................................................... 2
Modular Design ................................................................................................................................... 2
Fibre Channel (FC) SCSI Multiplexer (MUX) Connection.................................................................... 2
Base Product Configuration................................................................................................................. 3
STORAGE SYSTEM MODULES ..................................................................................................................... 4
MODULE ICONS......................................................................................................................................... 6
CHAPTER 2. INSTALLATION & CONFIGURATION.................................................................. 7
INSTALLATION OVERVIEW ......................................................................................................................... 8
APPLYING BAY LABELS ............................................................................................................................. 9
INSTALLING ADDITIONAL MODULES......................................................................................................... 10
Installing a Fan Module..................................................................................................................... 12
Installing a Power Module.................................................................................................................. 12
Installing a Disk Module .................................................................................................................... 13
Installing a DDS Tape Module ........................................................................................................... 15
SETTING SCSI ID SWITCHES ................................................................................................................... 16
CONNECTING SCSI CABLES AND TERMINATORS....................................................................................... 19
Applying SCSI Cable Labels............................................................................................................... 23
CONNECTING POWER CORDS ................................................................................................................... 24
POWERING-ON THE STORAGE SYSTEM ..................................................................................................... 25
Power-On Sequence ........................................................................................................................... 25
Powering-Off the Storage System........................................................................................................ 26
CONFIGURING THE HOST SYSTEM............................................................................................................. 27
Documentation References................................................................................................................. 27
CHAPTER 3. DDS TAPE MODULE............................................................................................... 29
DDS TAPE MODULE FRONT PANEL.......................................................................................................... 29
Self-Test............................................................................................................................................. 29
Status Lights....................................................................................................................................... 30
LOADING A DDS TAPE CARTRIDGE.......................................................................................................... 31
UNLOADING A DDS TAPE CARTRIDGE...................................................................................................... 32
Forcing DDS Tape Cartridge Ejection ............................................................................................... 32
WRITE-PROTECTING A DDS TAPE CARTRIDGE ......................................................................................... 33
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CONTROLLING DATA COMPRESSION .........................................................................................................34
CARE OF DDS TAPE CARTRIDGES.............................................................................................................34
Handling DDS Tape Cartridges ..........................................................................................................34
Storing DDS Tape Cartridges ............................................................................................................. 35
BACKUP ROUTINES...................................................................................................................................35
Model 1: Daily Backup....................................................................................................................... 35
Model 2: Weekly Rotation with Daily Backup .....................................................................................35
Model 3: Monthly and Weekly Rotation with Daily Backup .................................................................36
CLEANING TAPE HEADS............................................................................................................................ 37
ORDERING DDS TAPE CARTRIDGES..........................................................................................................38
DDS/MRS Logos.................................................................................................................................38
CHAPTER 4. TROUBLESHOOTING & DIAGNOSTICS.............................................................41
TROUBLESHOOTING OVERVIEW ................................................................................................................41
MODULE STATUS LIGHTS .........................................................................................................................42
TROUBLESHOOTING PROCEDURES.............................................................................................................45
SCSI Bus Troubleshooting Procedure.................................................................................................. 45
Fan Module Troubleshooting Procedure.............................................................................................47
Power Module Troubleshooting Procedures........................................................................................47
DDS Tape Module Troubleshooting Procedure................................................................................... 49
Disk Module Troubleshooting Procedure............................................................................................ 49
MODULE REPLACEMENT PROCEDURES ...................................................................................................... 50
Fan Module Replacement Procedure .................................................................................................. 50
Power Module Replacement Procedure ...............................................................................................52
DDS Tape Module Replacement Procedure......................................................................................... 53
Disk Module Replacement Procedures................................................................................................54
SE Disk Module Replacement Procedure (HP 3000 Series 900).......................................................... 56
SE Disk Module Replacement Procedure (HP 9000 Series 700, C-Series, J-Series).............................56
SE Disk Module Replacement Procedure (HP 9000 Series 800).......................................................... 56
DF Disk Module Replacement Requirements....................................................................................... 58
DF Disk Module Replacement/Recovery Procedure (HP 3000 Series 900)..........................................60
DF Disk Module Replacement Procedure (HP 9000 Series 700, C-Series, J-Series)............................ 60
DF Disk Module Replacement Procedure (HP 9000 Series 800, No Strict Mirroring)......................... 61
DF Disk Module Replacement/Recovery Procedure for Attached Physical Volumes (HP 9000 Series
800 with Strict Mirroring)...................................................................................................................63
DF Disk Module Replacement/Recovery Procedure for Unattached Physical Volumes (HP 9000 Series
800 with Strict Mirroring)...................................................................................................................68
DF Disk Module - Is the Volume Group or Physical Volume Group Active? (HP 9000 Series 800 with
Strict Mirroring) .................................................................................................................................70
DF Disk Module - Is the Physical Volume Attached? (HP 9000 Series 800 with Strict Mirroring).......71
DIAGNOSTIC INFORMATION ...................................................................................................................... 71
Self-Test Diagnostics........................................................................................................................... 71
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Online Diagnostics............................................................................................................................. 72
Disk Module Request Sense Information............................................................................................. 72
DDS Tape Module Request Sense Information.................................................................................... 80
CHAPTER 5. SERVICE................................................................................................................... 91
TOOLS REQUIRED.................................................................................................................................... 91
DOOR ASSEMBLY .................................................................................................................................... 92
Deskside Door .................................................................................................................................... 92
Rackmount Door ................................................................................................................................ 95
DESKSIDE SIDE PANEL............................................................................................................................. 97
DESKSIDE PEDESTAL BASE....................................................................................................................... 98
BACKPLANE ASSEMBLY........................................................................................................................... 99
Deskside Backplane Assembly............................................................................................................ 99
Rackmount Backplane Assembly........................................................................................................100
SCSI Bus Reset Switch .......................................................................................................................101
POWER BUTTON AND PUSH ROD..............................................................................................................104
TOP COVER............................................................................................................................................105
AC POWER ADAPTER .............................................................................................................................106
Deskside AC Power Adapter ..............................................................................................................106
Rackmount AC Power Adapter ..........................................................................................................107
MODULE CAM LEVER .............................................................................................................................108
ENCLOSURE REPLACEABLE PARTS...........................................................................................................110
APPENDIX A. A3312A RACKMOUNT INSTALLATION..............................................................121
APPENDIX B. PRODUCT SPECIFICATIONS.................................................................................133
APPENDIX C. REGULATORY STATEMENTS..............................................................................137
INDEX.................................................................................................................................................141
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Product Information
Chapter 1. Product Information
This chapter includes a product overview, base product information, and product features for rackmount
and deskside storage systems.
Product Overview
The HP A3311A deskside, HP A3312A field rackmount, and HP A3312AZ factory rackmount high
availability storage systems are scaleable mass storage systems optimized for high availability (see Figure
1). They are designed for use on the HP 9000 Series 700 and 800 with HP-UX, and the HP 3000 Series
900 with MPE-iX, Version 5.0/Express 3. These storage systems support single-ended (SE) disk modules,
fast/wide differential (DF) disk modules and single-ended digital data storage (DDS) tape modules. Both
single-ended and differential storage modules can reside within the same storage system on independent
buses. The HP A3312A can be installed into a 1.1-meter, 1.6-meter, or 2.0-meter EIA cabinet.
Figure 1. Storage Systems, Front View
A3311A Deskside A3312A/12AZ Rackmount
1 - Power Switch Cover 3 - P1 Power Module Status Light
2 - Security Lock (A3311A Only) 4 - P2 Power Module Status Light
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Product Information
Product Information
Product Overview
Key Features
The key features of the storage systems are:
• Dual wide SCSI bus, either single-ended or fast/wide differential
• Two redundant fan modules (shipped standard)
• Two redundant power modules (one shipped, one optional)
• Up to eight 1-inch-high, or four 1.6-inch-high slots
• Optimized for high availability
High Availability
The storage systems are optimized for high availability with the following features:
• Dual SCSI bus
• Hot pluggable, front-accessible modules
• Redundant fan and power modules
• Can mirror disks in the same storage system
• Can be integrated with mirrored disks in an HP-UX environment with MC/LockManager and
ServiceGuard
• Can be integrated with diagnostic tools to allow remote monitoring and troubleshooting.
SCSI Buses
The storage system contains two separate wide SCSI buses. One bus is connected to the slots in bay A and
the other bus is connected to the slots in bay B. Each bus can be used independently, or can be connected
together via an external SCSI cable to form one common bus. In a common bus configuration, four 1-inch
disk modules can be installed in each bay for a maximum of eight devices per bus, or two 1.6-inch disk
modules or DDS tape modules can be installed in each bay for a maximum of four devices per bus.
Modular Design
Each storage system contains the following modular components: fans, power supplies, disk drives, and
DDS tape drives. Each component is housed in a plastic module. Each storage system contains two slots
for fan modules, two slots for power modules, and eight 1-inch-high slots for disk modules or DDS tape
modules. Each module is easily removed by pulling out a locking lever, is installed or removed from the
front of the storage system, and can be used in any of the three storage system enclosures.
Fibre Channel (FC) SCSI Multiplexer (MUX) Connection
Fibre channel host connection is available through a Fibre Channel (FC) SCSI Multiplexer (MUX).
Configurations of the FC are detailed in the HP 9000 Enterprise Servers Configuration Guide. For
2
Product Information
Product Information
Product Overview
information regarding the Fibre Channel technology, refer to the Fibre Channel SCSI Multiplexer Service
and User Manual, part number A3308-90005.
NOTE! The term hot pluggable refers to modules that can be replaced while the host and
storage system are operating, without disrupting their operation. Not all modules are hot
pluggable, and some modules require the use of command line utilities before the module is
removed, and after the module is replaced. The storage systems do not support installation of
additional disk modules or DDS tape modules while the host and storage system are operating.
Fan Modules
The storage system is shipped with two fan modules, which provide redundant cooling. If one fan fails,
the remaining fan will provide enough cooling capacity for the storage system. Fan modules are hot
pluggable. Failed fan modules should be replaced as soon as possible.
Power Modules
The storage system is shipped with one power module. Two power modules provide redundant power for
the storage system. If one power module fails, the storage system continues operating on one power
module. If two power modules are used, both share the load. Power modules are hot pluggable.
Disk Modules
The storage system can contain any combination of 1-inch-high and 1.6-inch-high disk modules. A 1-inch
disk module occupies one slot in the storage system, and a 1.6-inch disk module occupies two slots. The
disk modules are available with either a single-ended (SE) or fast/wide differential (DF) SCSI interface.
The disk module is enclosed in a plastic module, so SCSI address (ID) jumpers are not accessible. SCSI
ID switches on the rear of the storage system are used to set the disk module SCSI ID.
DDS Tape Module
A 1.6-inch-high, single-ended DDS tape module can also be installed into the storage system. The DDS
tape module occupies two slots. The DDS tape module is enclosed in a plastic module, so tape module
jumpers and SCSI address (ID) jumpers are not accessible. SCSI ID switches on the rear of the storage
system are used to set the DDS tape module SCSI ID.
Base Product Configuration
The storage system base product configuration includes the following:
• one storage system (A3311A/12A/12AZ)
• two security keys (deskside only - located inside storage system door)
• door lock (A3311A only)
• bumper feet (A3311A only - located inside storage system door)
• two fan modules
• one power module and power cord
3
Product Information
Product Information
Storage System Modules
• SCSI bus label kit
• HP A3311A/12A/12AZ High Availability Storage Systems Installation/Service Manual
Storage System Modules
The following modules are supported in the storage systems (see Figure 2):
• fan module
• power module
• 1-inch disk module
• 1.6-inch disk module
• DDS tape module
Figure 2. Storage System Modules
Fan Module Power Module
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Product Information
Product Information
Storage System Modules
1-Inch Disk Module 1.6-Inch Disk Module DDS Tape Module
5
Product Information
Product Information
Module Icons
Module Icons
Icons are used to identify the disk, fan, and power modules. They are located in the upper left corner of
the module (see Figure 3).
Figure 3. Module Icons
Fan Module
Blue icon on black background
Power Module
Red icon on black background
Disk Module, 4.0-Gigabyte, Single-Ended (SE)
Yellow icon on black background
Yellow color bar on bottom
Disk Module, 4.0-Gigabyte, Differential (DF)
Purple icon on black background
Purple color bar on bottom
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Installation
Chapter 2. Installation & Configuration
CAUTION! The A3312A storage system should only be installed by an HP service
representative. See “Installing the A3312A into an EIA Cabinet”.
This chapter tells how to install and configure the deskside and rackmount storage systems. It includes
information on:
• installing the storage system
• installing additional storage modules
• setting SCSI ID switches
• connecting SCSI cabling
• applying SCSI bus labels
• connecting power cords
• powering-on the storage system
The term hot pluggable, refers to storage modules that can be replaced while the host is operating. Not all
modules are hot pluggable, and some modules require the use of command line utilities before the module
is removed, and after the module is replaced. Table 1 shows the HP systems that support hot pluggable
modules.
You cannot install additional disk modules or DDS tape modules while the host and storage system are
operating. When installing a new storage system, you must shut down the host before you connect power
to and power-on the storage system.
Table 1. HP System Support of Hot Pluggable Modules*
Module Type HP 3000 Series 900
MPE-iX, Version 5
with Express 3
Fan Yes Yes Yes
Power Yes Yes Yes
DDS Tape No No No
SE Disk No No No
DF Disk Yes No Yes
*Yes = Hot Pluggable; No = Not Hot Pluggable
HP 9000 Series 700,
C-Series and J-Series
HP 9000 Series 800
with Strict Mirroring
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Installation
Installation & Configuration
Installation Overview
Installation Overview
CAUTION! Shut down the host before connecting and powering-on the storage system.
1. Place the storage system close to an ac power outlet. Leave some space behind the storage system, so
you can set SCSI IDs and attach SCSI cables.
2. A3311A Only: Open the door by grasping the security lock tab and pulling the door toward you.
Remove the keys and bumper feet behind the door and install the bumper feet under the storage
system.
A3312A Only: Install the A3312A storage system into an EIA cabinet (see Appendix A).
3. Re-seat all factory-installed storage modules.
4. Apply SCSI bus labels to the storage system bays.
5. Install additional storage modules into the storage system.
6. Set the SCSI ID switches for the storage modules.
7. Shut down and power-off the host.
8. Connect the SCSI cables and terminators.
9. Apply SCSI bus labels to the SCSI cables.
10. Power-on your computer, then power-on the storage system. If your boot device is located in the
storage system, you may need to reboot your computer.
11. Perform an ioscan to see if the host will recognize any newly installed disk or tape modules.
8
Installation & Configuration
Installation
Applying Bay Labels
Applying Bay Labels
A SCSI bus label kit is included with the storage system, which enables you to identify the type of SCSI
bus associated with each bay (A or B). Apply the bay labels on the front and rear of the storage system.
Figure 4 shows how to differentiate bay A for single-ended devices and bay B for differential devices. This
is just an example of one configuration for the storage system. Your storage system may have two singleended buses, two differential buses, or a different bus for each bay.
Figure 4. Applying Bay Labels
9
Installation
Installation & Configuration
Installing Additional Modules
Installing Additional Modules
CAUTION! Do not touch the rear connector on a module. The module is susceptible to
electrostatic discharge (ESD) and damage to components may occur.
CAUTION! Do not install a single-ended (SE) module into a differential (DF) bus or a DF
module into an SE bus. The SCSI bus will hang and damage to the host bus adapter
(HBA) may occur.
NOTE! You should install storage modules in the order from bottom to top and from left to right.
The storage system is shipped with two fan modules and one power module. An additional power module,
disk modules, and DDS tape modules can be installed. Figure 5 shows the storage systems with their 1inch slot reference designators. 1-inch disk modules can use any of the 1-inch slots in bay A (A1 through
A4) and bay B (B1 through B4). 1.6-inch disk modules and DDS tape modules use two 1-inch slots. 1inch and 1.6-inch modules can be installed in a storage system in any combination of slots in bay A and
bay B.
10
Installation
Figure 5. Storage Module Slots
Installation & Configuration
Installing Additional Modules
A3, A4, B3, B4:
A1, A2, B1, B2:
.
F1, F2:
P1, P2:
Fan module slots (numbers not embossed on storage system).
Upper 1-inch module slots. Disk modules use delayed spin-up in order of SCSI ID. 1-inch
disk modules use SCSI ID switches A3, A4, B3, B4.
Lower 1-inch module slots. Valid boot device slots. Disk modules spin-up simultaneously.
1-inch disk modules use SCSI ID switches A1, A2, B1, B2.
Power module slots (numbers not embossed on storage system).
11
Installation
Installation & Configuration
Installing Additional Modules
Installing a Fan Module
NOTE! The storage system is shipped with two fan modules. See Chapter 4 for information on
replacing a fan module.
Installing a Power Module
The storage system is shipped with one power module.
To install a second power module for redundancy:
1. Pull out the module lever (see Figure 6).
CAUTION! Pull the module lever all the way out, or the module will jam in the slot.
2. Install the power module into slot P2.
3. Push in the module lever until it clicks to lock the module in place.
Figure 6. Installing a Power Module
12
Installation & Configuration
Installation
Installing Additional Modules
Installing a Disk Module
CAUTION! The disk modules located in slots A1, A2, B1, and B2 will power-on first, so a
boot device should only be installed in one of those slots.
NOTE! Replacement of a disk module is not the same as installing additional capacity in an
operating storage system! To add capacity, follow the steps below. To replace a disk module,
see Chapter 4.
To install a disk module:
1. Shut down the host and power-off the storage system.
2. Read and remove the module “Attention” label (see Figure 7).
Figure 7. Removing the Attention Label
3. Pull out the module lever (see Figure 8).
CAUTION! Pull the module lever all the way out, or the module will jam in the slot.
4. Install the disk module into the storage system.
5. Push in the module lever until it clicks to lock the module in place.
13
Installation
Installation & Configuration
Installing Additional Modules
Figure 8. Installing a Disk Module
14
Installation & Configuration
Installation
Installing Additional Modules
Installing a DDS Tape Module
To install DDS tape module:
1. Shut down the host and power-off the storage system.
2. Read and remove the module “Attention” label (see Figure 7).
3. Pull out the module lever (See Figure 9).
CAUTION! Pull the module lever all the way out, or the module will jam in the slot.
4. Install the DDS tape module in a single-ended (SE) slot.
5. Push in the module lever until it clicks to lock the module in place.
Figure 9. Installing a DDS Tape Module
15
Installation
Installation & Configuration
Setting SCSI ID Switches
Setting SCSI ID Switches
CAUTION! Do not set SCSI ID switches A3, A4, B3, or B4 to ID 0. If their IDs are set to 0,
an over-current condition will occur during the power-on sequence and the power
module will shut down.
CAUTION! All storage modules and host bus adapters (HBAs) must have unique SCSI
IDs. If two or more devices have the same SCSI ID on the SCSI bus, the host will not
recognize those devices.
NOTE! SCSI ID 7 is normally reserved for the host bus adapter (HBA). SCSI IDs 8 through 15
are used only by fast/wide differential (DF) modules.
To set SCSI ID switches for the disk and tape modules:
1. Perform an ioscan (HP-UX) or sysgen (MPE-iX) to determine which SCSI IDs are already in use.
2. Locate the SCSI ID switch for the device (see Figure 10, items 3 through 6 and 9 through 12).
3. Set the SCSI ID switch to an ID number not in use by another device (see Figure 11 and Figure 12):
• When setting SCSI IDs for 1-inch modules, use the SCSI ID switch that corresponds to the slot
number occupied by the module. For example, if a disk module occupies slot A4, use SCSI ID
switch A4.
• When setting SCSI IDs for 1.6-inch modules, use the SCSI ID switch that corresponds to the
lowest slot occupied by the module. For example, if a DDS tape module occupies slots A1 and
A2, use SCSI ID switch A1.
16
Installation & Configuration
Installation
Setting SCSI ID Switches
Figure 10. Storage Systems, Rear View
1 - Bus A Upper SCSI Connector (68-pin) 9 - SCSI ID Switch B1
2 - Bus A Lower SCSI Connector (68-pin) 10 - SCSI ID Switch B2
3 - SCSI ID Switch A1 11 - SCSI ID Switch B3
4 - SCSI ID Switch A2 12 - SCSI ID Switch B4
5 - SCSI ID Switch A3 13 - P1 AC Power Connector
6 - SCSI ID Switch A4 14 - P2 AC Power Connector
7 - Bus B Upper SCSI Connector (68-pin) 15 - SCSI Bus Reset Switch (Factory Set Only)
8 - Bus B Lower SCSI Connector (68-pin)
CAUTION! Changing default factory settings on the SCSI bus reset switch may cause
operating system conflicts for the host. Therefore, the SCSI bus reset switch is covered
with a label that states "Factory Set Only".
17
Installation
Installation & Configuration
Setting SCSI ID Switches
Figure 11. SCSI ID Switch Labels
8421 = SCSI ID bits (LSB=1)
1 = ON (Slide switch up to enable bit)
0 = OFF (Slide switch down to disable bit)
Figure 12. SCSI ID Switch Settings
18
Installation & Configuration
Installation
Connecting SCSI Cables and Terminators
Connecting SCSI Cables and Terminators
CAUTION! Before connecting SCSI cabling, shut down the host, power-off the host, then
power-off the storage system.
CAUTION! If your host has an HP 28696A adapter, you must have current firmware, or
the differential (DF) disk modules will not be hot pluggable. Contact your HP service
representative to get the current version.
NOTE!
To optimize SCSI bus performance:
• The cable between bus A and bus B must be 0.9 meters in length minimum.
• The cable between two A33xxAx storage systems must be 2.5 meters in length minimum.
The storage system contains two separate internal SCSI buses: bus A and bus B (see Figure 10). These
buses are isolated, so two different SCSI interfaces can be supported in the same storage system. Bus A
supports four devices in bay A (slots A1 through A4). Bus B supports four devices in bay B (slots B1
through B4). When a single bus is required, a 0.9-meter SCSI cable can be used to connect bus A and
bus B, forming one bus that supports eight devices.
A SCSI bus consists of the following components. All of these components must be of the same type,
single-ended (SE) or fast/wide differential (DF):
• a host bus adapter (HBA) card
• devices on the bus
• SCSI cabling
• a SCSI terminator (SF or DF)
Table 2 shows the SCSI bus requirements for the storage system.
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Installation
Installation & Configuration
Connecting SCSI Cables and Terminators
Table 2. SCSI Bus Requirements
Interface
Type1
SE 6 m HBA + 7 SE (Active)
DF 25 m HBA + 15 DF (Passive)
Notes:
1. SE = single-ended narrow; DF = fast/wide differential.
2. The total length of SCSI cabling is equal to the equivalent internal cable length (0.9 meter per
internal bus, or 1.0 meter per storage system) plus the external cable length. To connect internal
buses A and B, a bus interconnect cable is required.
3. Depending on the type of interface used, you may not be able to fully load the storage system with 1inch storage modules. For example, on a single-ended bus, you must leave one slot empty, since only
seven devices are supported in addition to the HBA. If two storage systems are connected on a
differential bus, eight slots can be filled in the first storage system and seven more slots can be filled
in the second storage system.
4. Each end of the SCSI bus must be terminated. The HBA card is one end of the bus. It includes its own
termination and also provides termination power. The other end of the bus is one of the SCSI
connectors on the rear panel of the storage system. Depending on the configuration, a 68-pin high
density SCSI terminator must be connected to one or both of these connectors. Refer to your host
system documentation for exact terminator specifications.
SCSI Cabling
Total Length2
Number
of Devices3
SCSI
Terminator4
Connect SCSI cables (see Figure 13 through Figure 15) and SCSI terminators (see Figure 16) to the
storage system in one of the following configurations:
• Single Bus: Bus B is connected to one host bus adapter (HBA), bus B and bus A are interconnected,
and bus A is terminated with a SCSI terminator (see Figure 13). Two storage systems can be
connected together on a common SCSI bus (see Figure 14).
• Split Bus: Bus A and bus B are connected to two separate HBAs, each terminated with a SCSI
terminator (see Figure 15). Both buses can have the same SCSI interface or can have different SCSI
interfaces.
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Installation & Configuration
Installation
Connecting SCSI Cables and Terminators
Figure 13. One Storage System on a Single Bus
1 - HBA to Bus B (1 m) 3 - Bus A Terminator
2 - Bus B to Bus A (0.9 m)
Figure 14. Two Storage Systems on a Single Bus
1 - HBA to Bus B1 (1 m) 4 - Bus B2 to Bus A2 (0.9 m)
2 - Bus B1 to Bus A1 (0.9 m) 5 - Bus A2 Terminator
3 - Bus A1 to Bus B2 (1 m)
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Installation
Installation & Configuration
Connecting SCSI Cables and Terminators
Figure 15. One Storage System on Split Buses
1 - HBA1 to Bus B (1 m) 3 - HBA2 to Bus A (1 m)
2 - Bus B Terminator 4 - Bus A Terminator
Figure 16. SCSI Terminators
SE Terminator DF Terminator
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Connecting SCSI Cables and Terminators
Installation
Applying SCSI Cable Labels
Apply the SCSI cable labels included in the SCSI bus label kit (see Figure 17).
Figure 17. Applying SCSI Cable Labels
Installation & Configuration
23
Installation
Installation & Configuration
Connecting Power Cords
Connecting Power Cords
WARNING! The storage system power cords are used as main disconnect devices. To
ensure that the power cords can be disconnected quickly, locate the storage system near
an easily accessible power outlet.
WARNING! To avoid a fire hazard, the ac branch service must be properly currentprotected by either a fuse or a circuit breaker. Use only UL/CSA approved power cord,
SVT type, rated for suitable voltage and current. These power cords have two conductors
and a ground. Failure to use the proper power cord may result in a shock or fire hazard.
NOTE! A fully loaded storage system can run on one power module. If the storage system has
two power modules for redundancy, we recommend that you plug the power cord for each power
module into a separate uninterruptable power supply (UPS). This will allow the storage system to
continue operating if one of the ac power sources fails.
To connect power cords:
Connect power cords to the P1 and P2 ac power connectors on the rear of the storage system (see Figure
10). In a redundant power module configuration, if one power module fails, the other power module will
provide power for the entire storage system.
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