IBM DS3500 Operating instructions

System Storage DS3500 and EXP3500
Installation, User's, and Maintenance
Guide
GA32-0952-01


Note: Before using this information and the product it supports, read the general information in “Notices” on page C-1 and
see the Warranty Information document that comes with the storage subsystem.
Fifth Edition (August 2011)
© Copyright IBM Corporation 2011, .
US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract
with IBM Corp.

Contents
Figures ..............vii
Tables ...............ix
Safety ...............xi
Safety statements ............xii
Chapter 1. Introduction .......1-1
DS3500 storage subsystem overview ......1-2
EXP3500 storage enclosure overview......1-3
Notices and statements in this document ....1-3
Features and operating specifications .....1-4
Models and optional devices ........1-5
Operating-system support .........1-6
Product updates ............1-6
Best practices guidelines ..........1-7
DS3500 storage subsystem and EXP3500 storage
enclosure components ..........1-8
Disk drives and bezels .........1-8
Controllers .............1-10
Environmental service modules ......1-11
AC power supply and fan units ......1-12
DC power supply and fan units ......1-12
Battery units ............1-13
Software and hardware compatibility and
upgrades ..............1-14
Software and firmware support code upgrades 1-14
Determining firmware levels .......1-14
Specifications .............1-15
Area requirements ..........1-15
Dimensions............1-15
Weight .............1-16
Temperature and humidity .......1-17
Electrical requirements .........1-18
Site wiring and power ........1-19
Power recovery ..........1-19
Power cords and receptacles ......1-19
Heat output, airflow, and cooling .....1-20
Chapter 2. Installing the storage
subsystem and storage enclosure . . 2-1
Installing the DS3500 storage subsystem ....2-1
Inventory checklist...........2-1
DS3500 installation overview .......2-2
Handling static-sensitive devices ......2-3
Preparing for installation ........2-3
Required tools and hardware ......2-4
Preparing the site ..........2-4
Installing the DS3500 storage subsystem in a
rack................2-4
Installing the EXP3500 storage enclosure ....2-5
Inventory checklist...........2-5
Installing the EXP3500 storage enclosure in a
rack................2-5
Chapter 3. Cabling the storage
subsystem and storage enclosure . . 3-1
Cabling the DS3500 storage subsystem .....3-1
Controller connectors (with Fibre Channel host
port adapters) ............3-1
Controller connectors (with 1 Gbps iSCSI host
port adapters) ............3-1
Controller connectors (with 10 Gbps iSCSI host
port adapters) ............3-2
Controller connectors (with SAS host port
adapters) ..............3-3
Enclosure ID settings ..........3-3
Working with SAS cables ........3-3
Working with SFP modules and fiber optic
cables ...............3-5
Handling fiber optic cables .......3-5
Installing SFP modules ........3-6
Removing SFP modules ........3-8
Using LC-LC Fibre Channel cables ....3-9
Using LC-SC Fibre Channel cable adapters 3-12
Cabling the EXP3500 storage enclosure . . . 3-15
ESM connectors ..........3-15
Single-ESM configuration .......3-16
Dual-ESM configuration .......3-16
Connecting storage enclosures to the DS3500 3-19
Redundant drive channel pair .....3-20
Overview of steps to connect storage
enclosures to a storage subsystem ....3-20
DS3500 storage subsystem drive cabling
topologies ............3-21
Adding a storage enclosure to a running
dual-controller configuration ......3-23
Upgrading a single-controller to a
dual-controller when there is no attached
EXP3500 enclosure ..........3-24
Upgrading a single-controller to a
dual-controller when there is one or more
EXP3500 enclosures attached to the storage
subsystem .............3-25
Connecting secondary interface cables ....3-25
Configuring the storage subsystem .....3-26
Storage subsystem management methods 3-26
Installing the storage subsystem
configuration ...........3-28
Connecting SAS hosts to the DS3500 . . . 3-28
Connecting Fibre Channel hosts to the
DS3500 .............3-34
Connecting iSCSI hosts to the DS3500 . . . 3-39
Overview of installing an IBM BladeCenter
configuration to connect to a DS3500 ....3-44
Installing the BladeCenter configuration 3-45
Connecting BladeCenter hosts to the DS3500 3-45
Cabling the DS3500 and EXP3500 ac power
supplies ...............3-46
© Copyright IBM Corp. 2011, iii

Cabling the DS3500 and EXP3500 dc power
supplies ...............3-47
Chapter 4. Operating the storage
subsystem and storage enclosure . . 4-1
Performing the health check process ......4-1
Hardware inspection ...........4-2
Turning on the storage subsystem ......4-2
Installing the Storage Manager Client .....4-4
Monitoring status through software ......4-5
Firmware updates ...........4-6
Troubleshooting the storage subsystem ....4-6
Checking the LEDs ...........4-7
AC power-supply LEDs .........4-7
DC power-supply LEDs .........4-8
Front LEDs .............4-8
Controller LEDs ...........4-9
Seven-segment numeric display LEDs ....4-12
ESM LEDs .............4-14
Turning off the storage subsystem ......4-14
Performing an emergency shutdown ....4-17
Restoring power after an unexpected shutdown 4-17
Recovering from an overheated power supply 4-18
Cache memory and cache battery ......4-20
Cache memory ...........4-20
Controller cache battery ........4-20
Cache battery learn cycle ........4-21
Chapter 5. Replacing components . . 5-1
OK to remove LED ...........5-1
Working with controllers..........5-1
Removing a controller .........5-2
Removing and installing a cover ......5-2
Installing a controller ..........5-3
Replacing a controller..........5-5
Removing and disposing of the system-board
lithium battery ............5-8
Installing an optional host port adapter or replacing
a failed host port adapter .........5-9
Working with hot-swap drives .......5-12
Removing a hard disk drive .......5-13
Installing a hard disk drive .......5-15
Replacing a hot-swap drive .......5-16
Replacing multiple drives ........5-17
Replacing all drives at the same time . . . 5-18
Replacing the drives one at a time ....5-19
Replacing an ac power supply .......5-21
Replacing a dc power supply ........5-26
Replacing a battery ...........5-31
Replacing the memory cache DIMM .....5-33
Removing the DIMM .........5-34
Installing the DIMM ..........5-35
Replacing the bezels ...........5-36
Removing the bezels..........5-36
Installing the bezels ..........5-36
Working with environmental service modules . . 5-36
Installing an additional ESM .......5-37
Replacing an ESM ..........5-37
Replacing a midplane assembly .......5-38
Chapter 6. Solving problems .....6-1
Solving problems in the DS3500 storage subsystem 6-1
Solving problems in the EXP3500 storage enclosure 6-6
Chapter 7. Parts listing, DS3500
storage subsystem and EXP3500
storage enclosure .........7-1
Replaceable components ..........7-1
DS3512 storage subsystem and EXP3512 storage
enclosure parts listing...........7-1
DS3524 storage subsystem and EXP3524 storage
enclosure parts listing...........7-3
Power cords ..............7-5
Appendix A. Records ........A-1
Identification numbers ..........A-1
Hard disk drive locations .........A-1
Storage subsystem and controller information
record................A-2
Appendix B. Getting help and
technical assistance ........B-1
Before you call .............B-1
Using the documentation .........B-2
Getting help and information from the World Wide
Web................B-2
Software service and support ........B-2
Hardware service and support........B-2
IBM Taiwan product service ........B-3
Notices ..............C-1
Trademarks ..............C-1
Important notes ............C-2
Particulate contamination .........C-3
Documentation format ..........C-3
Electronic emission notices .........C-4
Federal Communications Commission (FCC)
statement..............C-4
Industry Canada Class A emission compliance
statement..............C-4
Avis de conformité à la réglementation
d'Industrie Canada ..........C-4
Australia and New Zealand Class A statement C-4
European Union EMC Directive conformance
statement..............C-4
Germany Class A statement .......C-5
Japan Voluntary Control Council for
Interference (VCCI) Class A Statement ....C-6
Japan Electronics and Information Technology
Industries Association (JEITA) statement . . . C-6
Japan Electronics and Information Technology
Industries Association (JEITA) statement . . . C-6
Korean Communications Commission (KCC)
Class A Statement ...........C-6
Russia Electromagnetic Interference (EMI) Class
A statement .............C-6
People's Republic of China Class A electronic
emission statement ..........C-7
Taiwan Class A compliance statement ....C-7
iv System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide

Index ...............X-1
Contents v

vi System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide

Figures
1-1. Serial number label, and product name,
machine type, and model number label
locations ............1-2
1-2. DS3512 storage subsystem and EXP3512
storage enclosure hot-swap drive bays and
bezels .............1-8
1-3. DS3524 storage subsystem and EXP3524
storage enclosure hot-swap drive bays and
bezels .............1-9
1-4. Left-side bezel...........1-9
1-5. Right-side bezel (DS3512 and EXP3512) 1-10
1-6. Bottom shelf (DS3524 and EXP3524) 1-10
1-7. Rear view, single-controller model (shown
without an optional host port adapter) . . 1-11
1-8. Rear view, single ESM model storage
enclosure ............1-12
1-9. AC power supply components .....1-12
1-10. DC power supply components .....1-13
1-11. DC power supply connector - pin positions 1-13
1-12. Battery unit ...........1-13
1-13. DS3512 storage subsystem and EXP3512
storage enclosure dimensions .....1-16
1-14. DS3524 storage subsystem and EXP3524
storage enclosure dimensions .....1-16
1-15. Example of cold aisle/hot aisle rack
configuration...........1-20
3-1. Dual-controller DS3500 storage subsystem
ports and controllers (with optional Fibre
Channel host port adapter) ......3-1
3-2. Dual-controller DS3500 storage subsystem
ports and controllers (with optional iSCSI
host port adapter) .........3-2
3-3. Dual-controller DS3500 storage subsystem
ports and controllers (with optional 10 iSCSI
host port adapter) .........3-2
3-4. Dual-controller DS3500 storage subsystem
ports and controllers (with an optional SAS
host port adapter) .........3-3
3-5. Mini-SAS cable ..........3-4
3-6. Connecting a mini-SAS cable ......3-4
3-7. Removing a mini-SAS cable ......3-5
3-8. SFP module and protective cap .....3-7
3-9. Installing an SFP module into the host port 3-8
3-10. Unlocking the SFP module latch - plastic
variety .............3-8
3-11. Unlocking the SFP module latch - wire
variety .............3-9
3-12. LC-LC Fibre Channel cable ......3-9
3-13. Removing fiber optic cable protective caps 3-10
3-14. Inserting an LC-LC Fibre Channel cable
into an SFP module ........3-11
3-15. LC-LC Fibre Channel cable lever and
latches .............3-11
3-16. Removing the LC-LC Fibre Channel cable 3-12
3-17. LC-SC Fibre Channel cable adapter 3-12
3-18. Removing the LC-SC cable adapter
protective caps ..........3-13
3-19. Connecting an LC-LC cable into the LC-SC
cable adapter...........3-14
3-20. LC-LC Fibre Channel cable lever and
latches .............3-14
3-21. Removing the LC-LC Fibre Channel cable
from an LC-SC Fibre Channel cable
adapter.............3-15
3-22. ESM connectors ..........3-15
3-23. Example of a redundant drive path 3-20
3-24. One single-controller DS3500 and multiple
single-ESM storage enclosures .....3-21
3-25. One dual-controller DS3500 and one
storage enclosure .........3-22
3-26. One dual-controller DS3500 and two
storage enclosures .........3-22
3-27. One dual-controller DS3500 and eight
storage enclosures .........3-23
3-28. Ethernet port locations on a dual-controller
DS3500.............3-26
3-29. Host-agent (in-band) managed storage
subsystems ...........3-27
3-30. Direct (out-of-band) managed storage
subsystems ...........3-28
3-31. Single-controller direct-attached SAS
connection to a single-host HBA ....3-30
3-32. Single-controller direct-attached SAS
connection to dual HBAs in a single-host
(redundant host connection)......3-30
3-33. Single-controller direct-attached SAS
connection to single HBAs in multiple
hosts .............3-31
3-34. Dual-controller direct-attached SAS
connection to two HBAs in the same host
(redundant host connection)......3-31
3-35. Dual-controller direct-attached SAS
connections to multiple HBAs in multiple
hosts .............3-32
3-36. Dual-controller DS3500 or single-controller
DS3500 SAS connection to multiple hosts
using one SAS switch ........3-32
3-37. Dual-controller DS3500 SAS connection to
multiple hosts using two separate SAS
switches ............3-33
3-38. Multiple dual-controller DS3500s SAS
connection to multiple hosts using two
using two separate SAS switches ....3-33
3-39. Dual-controller DS3500 SAS connection to
multiple hosts using two SAS switches that
are connected together via an interlink
switch .............3-34
3-40. Location of host connectors on storage
controllers............3-35
3-41. Single-controller direct-attached Fibre
Channel connection to a single host HBA . 3-35
© Copyright IBM Corp. 2011, vii

3-42. Single-controller direct-attached Fibre
Channel connection to dual HBAs
(redundant host connection)......3-36
3-43. Single-controller direct-attached Fibre
Channel connection to single HBAs in
multiple hosts ..........3-36
3-44. Dual-controller direct-attached Fibre
Channel connection to two HBAs in the
same host (redundant host connection) . . 3-37
3-45. Dual-controller direct-attached Fibre
Channel connections to multiple HBAs in
multiple hosts ..........3-37
3-46. Example of a single Fibre Channel SAN
fabric configuration ........3-38
3-47. Example of a dual Fibre Channel SAN
fabric configuration ........3-39
3-48. Example of two storage subsystems in a
dual Fibre Channel SAN environment . . 3-39
3-49. Single-host, single-controller iSCSI
configuration...........3-41
3-50. Multiple-port, single-controller iSCSI
configuration...........3-41
3-51. Multiple single-port hosts, single-controller
iSCSI configuration.........3-42
3-52. Multiple-host, multiple-port,
single-controller, and redundant-path iSCSI
configuration...........3-42
3-53. Multiple-host, multiple-port,
multiple-storage-subsystem iSCSI
configuration...........3-43
3-54. Single-host, multiple-port, dual-controller
iSCSI configuration.........3-43
3-55. Multiple-host, multiple-port,
dual-controller iSCSI configuration . . . 3-44
3-56. Example of a multiple-host, multiple-port,
and multiple-fabric (Fibre Channel or
iSCSI, and SAS) configuration .....3-44
3-57. Example of a DS3500 that is connected to
one BladeCenter unit ........3-46
3-58. DC power connector - pin positions 3-48
3-59. DC wiring from DS3500 to disconnect
device and dc power source......3-48
4-1. Power-supply switches and connectors for
DS3500 ac models .........4-3
4-2. Power-supply switches and connectors for
DS3500 dc models .........4-3
4-3. AC power-supply LEDs .......4-7
4-4. DC power-supply LEDs .......4-8
4-5. DS3512 storage subsystem and EXP3512
storage enclosure front LEDs and controls . 4-8
4-6. DS3524 storage subsystem and EXP3524
storage enclosure front LEDs ......4-9
4-7. Controller LEDs ..........4-9
4-8. iSCSI host port adapter LEDs .....4-10
4-9. Fibre Channel host port adapter LEDs 4-11
4-10. SAS host port adapter LEDs......4-11
4-11. 10 Gbps iSCSI port LEDs.......4-12
4-12. Numeric display LEDs .......4-12
4-13. ESM LEDs ...........4-14
5-1. Removing a controller ........5-2
5-2. Removing the cover .........5-3
5-3. Installing a controller ........5-4
5-4. Removing and replacing a controller 5-6
5-5. Removing the battery unit from the
controller ............5-7
5-6. Removing a controller........5-10
5-7. Removing the host port adapter filler panel 5-10
5-8. Installing a host port adapter .....5-11
5-9. DS3512 storage subsystem and EXP3512
storage enclosure drive LEDs .....5-13
5-10. DS3524 storage subsystem and EXP3524
storage enclosure drive LEDs .....5-13
5-11. Removing a drive from a DS3512 or
EXP3512 ............5-14
5-12. Removing a drive from a DS3524 or
EXP3524 ............5-14
5-13. Installing a drive in a DS3512 or EXP3512 5-15
5-14. Installing a drive in a DS3524 or EXP3524 5-16
5-15. Replacing a power supply ......5-25
5-16. Replacing a power supply ......5-30
5-17. Removing a controller........5-32
5-18. Removing a battery unit from the
controller ............5-32
5-19. Memory cache DIMM location .....5-34
5-20. Removing a controller........5-34
5-21. Removing the DIMM from the controller 5-35
5-22. Installing the DIMM in the controller 5-35
5-23. Removing the bezels ........5-36
5-24. Removing an environmental service
module.............5-38
5-25. Replacing the midplane assembly in a
DS3512 or EXP3512 ........5-39
5-26. Replacing the midplane assembly in a
DS3524 or EXP3524 ........5-39
7-1. DS3512 storage subsystem and EXP3512
storage enclosure storage subsystem parts . 7-2
7-2. DS3524 storage subsystem and EXP3524
storage enclosure parts ........7-4
A-1. Serial number location on the DS3500 A-1
viii System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide

Tables
1-1. Features and operating specifications 1-4
1-2. DS3500 models and optional devices 1-5
1-3. DC power supply connector - pin
descriptions ...........1-13
1-4. DS3512 storage subsystem and EXP3512
storage enclosure weights ......1-16
1-5. DS3524 storage subsystem and EXP3524
storage enclosure weights ......1-17
1-6. DS3500 component weights ......1-17
1-7. Temperature and humidity requirements
for storage subsystems in an Information
Technology (IT) or office environment . . 1-17
1-8. Temperature and humidity requirements
for storage subsystems in a NEBS/ETSI
compliant environment .......1-18
1-9. DS3500 ac power requirements.....1-19
1-10. DS3500 dc power requirements 1-19
3-1. Maximum number of EXP3512 and
EXP3524 storage enclosures with controller
firmware level 7.77.xx.xx and later . . . 3-19
3-2. Maximum number of EXP3512 and
EXP3524 storage enclosures with controller
firmware level 7.75.xx.xx and earlier . . . 3-19
3-3. DC power supply connector - pin
descriptions ...........3-48
3-4. DC power source wiring descriptions 3-48
4-1. Fibre Channel port LEDs .......4-11
4-2. Controller numeric display diagnostic
codes .............4-12
4-3. ESM numeric display diagnostic codes 4-13
6-1. Troubleshooting ..........6-2
6-2. Troubleshooting information ......6-6
7-1. Parts listing for DS3500........7-2
7-2. Parts listing for DS3500........7-4
7-3. IBM power cords..........7-5
A-1. Product identification record......A-1
A-2. Drive location information record A-1
A-3. Storage subsystem and controller
information record .........A-2
A-4. Sample information record ......A-3
C-1. Limits for particulates and gases C-3
© Copyright IBM Corp. 2011, ix

xSystem Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide

Safety
Before installing this product, read the Safety Information.
Antes de instalar este produto, leia as Informações de Segurança.
Læs sikkerhedsforskrifterne, før du installerer dette produkt.
Lees voordat u dit product installeert eerst de veiligheidsvoorschriften.
Ennen kuin asennat tämän tuotteen, lue turvaohjeet kohdasta Safety Information.
Avant d'installer ce produit, lisez les consignes de sécurité.
Vor der Installation dieses Produkts die Sicherheitshinweise lesen.
Prima di installare questo prodotto, leggere le Informazioni sulla Sicurezza.
© Copyright IBM Corp. 2011, xi

Les sikkerhetsinformasjonen (Safety Information) før du installerer dette produktet.
Antes de instalar este produto, leia as Informações sobre Segurança.
Antes de instalar este producto, lea la información de seguridad.
Läs säkerhetsinformationen innan du installerar den här produkten.
Safety statements
These statements provide the caution and danger information used in this documentation.
Important:
Each caution and danger statement in this documentation is labeled with a number. This number is used
to cross reference an English-language caution or danger statement with translated versions of the caution
or danger statement in the Safety Information document.
For example, if a caution statement is labeled “Statement 1,” translations for that caution statement are in
the Safety Information document under “Statement 1.”
Be sure to read all caution and danger statements in this documentation before you perform the
procedures. Read any additional safety information that comes with your system or optional device
before you install the device.
Statement 1
xii System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide

DANGER
Electrical current from power, telephone, and communication cables is hazardous.
To avoid a shock hazard:
vDo not connect or disconnect any cables or perform installation, maintenance, or reconfiguration
of this product during an electrical storm.
vConnect all power cords to a properly wired and grounded electrical outlet.
vConnect to properly wired outlets any equipment that will be attached to this product.
vWhen possible, use one hand only to connect or disconnect signal cables.
vNever turn on any equipment when there is evidence of fire, water, or structural damage.
vDisconnect the attached power cords, telecommunications systems, networks, and modems before
you open the device covers, unless instructed otherwise in the installation and configuration
procedures.
vConnect and disconnect cables as described in the following table when installing, moving, or
opening covers on this product or attached devices.
To Connect: To Disconnect:
1. Turn everything OFF.
2. First, attach all cables to devices.
3. Attach signal cables to connectors.
4. Attach power cords to outlet.
5. Turn device ON.
1. Turn everything OFF.
2. First, remove power cords from outlet.
3. Remove signal cables from connectors.
4. Remove all cables from devices.
Statement 2
CAUTION:
When replacing the lithium battery, use only IBM®Part Number 33F8354 or an equivalent type battery
recommended by the manufacturer. If your system has a module containing a lithium battery, replace
it only with the same module type made by the same manufacturer. The battery contains lithium and
can explode if not properly used, handled, or disposed of.
Do not:
vThrow or immerse into water
vHeat to more than 100°C (212°F)
vRepair or disassemble
Dispose of the battery as required by local ordinances or regulations.
Statement 3
Safety xiii

CAUTION:
When laser products (such as CD-ROMs, DVD drives, fiber optic devices, or transmitters) are
installed, note the following:
vDo not remove the covers. Removing the covers of the laser product could result in exposure to
hazardous laser radiation. There are no serviceable parts inside the device.
vUse of controls or adjustments or performance of procedures other than those specified herein
might result in hazardous radiation exposure.
DANGER
Some laser products contain an embedded Class 3A or Class 3B laser diode. Note the following.
Laser radiation when open. Do not stare into the beam, do not view directly with optical
instruments, and avoid direct exposure to the beam.
Class 1 Laser Product
Laser Klasse 1
Laser Klass 1
Luokan 1 Laserlaite
Appareil A Laser de Classe 1
`
Statement 4
≥18 kg (39.7 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb)
CAUTION:
Use safe practices when lifting.
Statement 5
xiv System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide

CAUTION:
The power control button on the device and the power switch on the power supply do not turn off the
electrical current supplied to the device. The device also might have more than one power cord. To
remove all electrical current from the device, ensure that all power cords are disconnected from the
power source.
Statement 8
CAUTION:
Never remove the cover on a power supply or any part that has the following label attached.
Hazardous voltage, current, and energy levels are present inside any component that has this label
attached. There are no serviceable parts inside these components. If you suspect a problem with one
of these parts, contact a service technician.
Statement 11
CAUTION:
The following label indicates sharp edges, corners, or joints nearby.
Statement 12
CAUTION:
The following label indicates a hot surface nearby.
Safety xv

Statement 13
DANGER
Overloading a branch circuit is potentially a fire hazard and a shock hazard under certain
conditions. To avoid these hazards, ensure that your system electrical requirements do not exceed
branch circuit protection requirements. Refer to the information that is provided with your device
for electrical specifications.
Statement 15
CAUTION:
Make sure that the rack is secured properly to avoid tipping when the server unit is extended.
Statement 17
CAUTION:
The following label indicates moving parts nearby.
Statement 26
xvi System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide

CAUTION:
Do not place any object on top of rack-mounted devices.
Statement 29
CAUTION:
This equipment is designed to permit the connection of the earthed conductor of the dc supply circuit
to the earthing conductor at the equipment. If this connection is made, all of the following conditions
must be met:
vThis equipment shall be connected directly to the dc supply system earthing electrode conductor or
to a bonding jumper from an earthing terminal bar or bus to which the dc supply system earthing
electrode conductor is connected.
vThis equipment shall be located in the same immediate area (such as, adjacent cabinets) as any
other equipment that has a connection between the earthed conductor of the same dc supply circuit
and the earthing conductor, and also the point of earthing of the dc system. The dc system shall not
be earthed elsewhere.
vThe dc supply source shall be located within the same premises as this equipment.
vSwitching or disconnecting devices shall not be in the earthed circuit conductor between the dc
source and the point of connection of the earthing electrode conductor.
Statement 34
Safety xvii

CAUTION:
To reduce the risk of electric shock or energy hazards:
vThis equipment must be installed by trained service personnel in a restricted-access location, as
defined by the NEC and IEC 60950-1, First Edition, The Standard for Safety of Information
Technology Equipment.
vConnect the equipment to a reliably grounded safety extra low voltage (SELV) source. An SELV
source is a secondary circuit that is designed so that normal and single fault conditions do not cause
the voltages to exceed a safe level (60 V direct current).
vIncorporate a readily available approved and rated disconnect device in the field wiring.
vSee the specifications in the product documentation for the required circuit-breaker rating for
branch circuit overcurrent protection.
vUse copper wire conductors only. See the specifications in the product documentation for the
required wire size.
vSee the specifications in the product documentation for the required torque values for the
wiring-terminal nuts.
Statement 37
DANGER
When you populate a rack cabinet, adhere to the following guidelines:
vAlways lower the leveling pads on the rack cabinet.
vAlways install the stabilizer brackets on the rack cabinet.
vAlways install the heaviest devices in the bottom of the rack cabinet.
vDo not extend multiple devices from the rack cabinet simultaneously, unless the rack-mounting
instructions direct you to do so. Multiple devices extended into the service position can cause
your rack cabinet to tip.
vIf you are not using the IBM 9308 rack cabinet, securely anchor the rack cabinet to ensure its
stability.
Attention: This product is suitable for use on an IT power distribution system whose maximum phase
to phase voltage is 240 V under any distribution fault condition.
xviii System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide

Chapter 1. Introduction
This chapter describes the operating specifications, features, and components of the IBM System Storage®
DS3500 storage subsystem and the IBM System Storage EXP3500 storage enclosure. The DS3500 storage
subsystem and EXP3500 storage enclosure consist of the following models:
vDS3512 storage subsystem
vDS3524 storage subsystem
vEXP3512 storage enclosure
vEXP3524 storage enclosure
This chapter also includes an inventory checklist and important information about best practices
guidelines and product updates for your DS3500 storage subsystem and EXP3500 storage enclosure.
If firmware and documentation updates are available, you can download them from the IBM Web site.
The DS3500 storage subsystem and EXP3500 storage enclosure might have features that are not described
in the documentation that comes with the device, and the documentation might be updated occasionally
to include information about those features, or technical updates might be available to provide additional
information that is not included in the DS3500 storage subsystem and EXP3500 storage enclosure
documentation.
To check for updates, complete the following steps:
1. Go to http://www.ibm.com/servers/storage/support/.
2. On the “Support for System Storage and TotalStorage products” page, under Select your product,in
the Product family field, select Disk systems.
3. In the Product field, select DS3500 or EXP3500.
4. Click Go.
5. Make the following selections:
vFor firmware updates, click the Download tab.
vFor documentation updates, click the Install and use tab.
Note: Changes are made periodically to the IBM Web site. Procedures for locating firmware and
documentation might vary slightly from what is described in this document.
The DS3500 storage subsystem and EXP3500 storage enclosure come with a limited warranty. For more
information about the terms of your warranty, see the Warranty Information document that comes with the
device.
Record information about the DS3500 storage subsystem and EXP3500 storage enclosure in “Storage
subsystem and controller information record” on page A-2. You will need this information if you have to
call for service.
Figure 1-1 on page 1-2shows the location of the serial number label, and the product name, and machine
type, model, and serial number label.
Note: The illustrations in this document might differ slightly from your hardware.
© Copyright IBM Corp. 2011, 1-1

Use “Hard disk drive locations” on page A-1 to keep a record of the drives that are installed in or
attached to the DS3500 storage subsystem and EXP3500 storage enclosure. This information can be
helpful when you install additional drives or if you have to report a hardware problem. Make a copy of
this table before you record information in it, in case you need extra space to write new values later, or
when you update the DS3500 storage subsystem and EXP3500 storage enclosure configuration.
DS3500 storage subsystem overview
With direct-attached Serial Attached SCSI (SAS) connectivity and support for RAID levels 0, 1, 3, 5, and 6,
the DS3500 storage subsystem provides an internal physical storage capacity that is scalable up to 36 TB
(terabytes) for the DS3512 and 24 TB for the DS3524 storage subsystem.
Note:
1. RAID 6 uses a P+Q design implementation.
2. When RAID level 1 is implemented and the number of drives increases to more than two, RAID level
10 is automatically implemented.
The DS3500 is a 2U rack-mountable storage subsystem that supports up to two redundant, dual-active
RAID storage controllers. The DS3500 storage subsystem comes standard with two 6 Gbps x4 SAS host
ports and a single 6 Gbps x4 SAS expansion port per controller. Each controller contains 1 GB of cache
memory that is upgradable to 2 GB of cache. Also, each controller supports the installation of the
following host port adapters:
v6 Gbps SAS
v8 Gbps FC
v1 Gbps iSCSI
v10 Gbps iSCSI
When attached to EXP3500 storage enclosures, the DS3500 storage subsystem can be expanded to support
96 drives. This can be expanded to 192 drives when using the 96-192 drive expansion upgrade. The
DS3500 storage subsystem and EXP3500 storage enclosures support configurations of 6 Gbps SAS, Near
Line (NL) SAS, Solid State Disk (SSD), 6 Gbps SAS Full Disk Encryption (FDE) disk drives, or a mix of
disk drives. To use the FDE disk encryption functionality, you must purchase the Full Disk Encryption
option.
Advanced DS3500 storage management, copy service options, and optional advanced disaster recovery
functions are available for the DS3500, including FlashCopy®, VolumeCopy, and Enhanced Remote
Mirroring.
Serial number label
Product name Machine type, model, and
serial number label
Figure 1-1. Serial number label, and product name, machine type, and model number label locations
1-2 System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide