MAXDATA SR1202 M1 User manual

Technical User Guide
MAXDATA SR1202 M1

2 Contents

3MAXDATA SR1202 M1 – Technical User Guide
Contents
1 Preface 7
Notices ....................................................................................................................................................7
Acknowledgments ..................................................................................................................................7
What is in this guide ................................................................................................................................7
Who should use this guide ......................................................................................................................7
International Standards ............................................................................................................................7
Potential for Radio Frequency Interference .............................................................................................7
USA Federal Communications Commission (FCC) .............................................................................7
European Regulations ........................................................................................................................8
Safety ......................................................................................................................................................8
Battery Safety ........................................................................................................................................11
Expansion Connectors ...........................................................................................................................11
EMC Precautions ..............................................................................................................................11
Rack System Precautions ......................................................................................................................11
ESD Precautions ....................................................................................................................................12
Recycling of Waste Electrical and Electronic Equipment (WEEE) .........................................................12
Data Security .........................................................................................................................................12
Special Tools and Equipment ................................................................................................................12
2 Introduction 13
SR1202 Enclosure Platform ..................................................................................................................13
The Enclosure Core Product ..................................................................................................................14
Enclosure Chassis .................................................................................................................................14
Operator’s Panel ....................................................................................................................................15
Alarms ...................................................................................................................................................16
Visible Alarms ...................................................................................................................................16
Audible Alarms .................................................................................................................................16
The Plug-in Modules ..............................................................................................................................17
AC Power Supply Module ................................................................................................................17
Multiple Power Supply Modules ......................................................................................................18
Cooling Module ................................................................................................................................18
SR1202 RAID Controller Module ......................................................................................................19
Battery Module .................................................................................................................................21
Drive Carrier Module ........................................................................................................................22
Dummy Carrier Modules ..................................................................................................................23
Blank Modules ..................................................................................................................................23
Technical Specifications ........................................................................................................................24
Dimensions ......................................................................................................................................24
Weight ..............................................................................................................................................24
AC Power (350 W PSU) ....................................................................................................................24
PSU Safety and EMC Compliance ....................................................................................................24
Power Cords .....................................................................................................................................24
Environment .....................................................................................................................................25
Interfaces .........................................................................................................................................25
SR1202 RAID Controller Module Specification ................................................................................26
Drive Carrier Module Specification ...................................................................................................26

4 Contents
3 Getting Started 27
Introduction ...........................................................................................................................................27
Planning Your Installation ......................................................................................................................27
Enclosure Drive Bay Numbering Convention ...................................................................................28
Drive Carrier Configuration ...............................................................................................................28
Enclosure Installation Procedures .........................................................................................................28
Pre-Requisites ..................................................................................................................................28
Rack Mounting Rail Kit .....................................................................................................................29
Chassis Installation ...........................................................................................................................29
Module Installation ................................................................................................................................30
Management Interfaces ........................................................................................................................30
StorView® Storage Management Software ......................................................................................30
RAID Configuration Utility (Menu-based) .........................................................................................30
RAID Configuration Utility (Text-based) ............................................................................................30
Enclosure Configuration ........................................................................................................................31
Fibre Channel Interface .........................................................................................................................31
Enclosures Expansion ...........................................................................................................................33
Drive Slot Arrangement .........................................................................................................................33
Drive Start ........................................................................................................................................33
Engaging the Anti-tamper Locks ......................................................................................................33
Power Cord Connection ........................................................................................................................34
Parts Check List ...............................................................................................................................34
Procedure .........................................................................................................................................34
Grounding Checks .................................................................................................................................35
4 Operation 37
Before You Begin ..................................................................................................................................37
Power On ..............................................................................................................................................37
Starting the Drives .................................................................................................................................37
Disk Drives LEDs ..............................................................................................................................37
Power Down .........................................................................................................................................38
5 Troubleshooting and Problem Solving 39
Overview ...............................................................................................................................................39
Initial Start-up Problems ...................................................................................................................39
LEDs ......................................................................................................................................................40
Power Supply Module LEDs ............................................................................................................40
Cooling Module LEDs .......................................................................................................................40
Ops Panel LEDs ...............................................................................................................................40
SR1202 RAID Controller Module LEDs ............................................................................................42
Drive Carrier LEDs ............................................................................................................................42
Audible Alarm ........................................................................................................................................42
Audible Alarm Mute .........................................................................................................................43
LED Test Mode ................................................................................................................................43
Drive Carrier Module Faults ...................................................................................................................43
Auto Start Failure ..............................................................................................................................43
Troubleshooting .....................................................................................................................................44
System Faults ...................................................................................................................................44
Power Supply Faults .........................................................................................................................44
Thermal Control ................................................................................................................................45
Thermal Alarm ..................................................................................................................................45
Thermal Warnings ............................................................................................................................45
Dealing with Hardware Faults ...............................................................................................................46

5MAXDATA SR1202 M1 – Technical User Guide
Continuous Operation During Replacement ..........................................................................................46
Ops Panel .........................................................................................................................................46
Replacing a Module ...............................................................................................................................46
Power Supply Modules .........................................................................................................................47
Removing an AC Power Supply Module ..........................................................................................47
Installing an AC Power Supply Module ............................................................................................48
Cooling Module .....................................................................................................................................48
Removing a Cooling Module ............................................................................................................48
Installing a Cooling Module ..............................................................................................................49
SR1202 RAID Controller Module ...........................................................................................................50
Removing an SR1202 RAID Controller Module ................................................................................50
Installing an SR1202 RAID Controller Module ..................................................................................52
Battery Module ......................................................................................................................................53
Removing a Battery Module .............................................................................................................53
Installing a Battery Module ...............................................................................................................54
Drive Carrier Module .............................................................................................................................55
Removing a Drive Carrier Module ....................................................................................................55
Installing a Drive Carrier Module ......................................................................................................56
Dummy Drive Carrier Module Removal/Replacement .....................................................................58
Tables
1. Status LEDs ....................................................................................................................................16
2. Power Supply LEDs .........................................................................................................................18
3. Cooling Module Fault LED ...............................................................................................................18
4. Ambient Temperature and Humidity ...............................................................................................25
5. Enclosure System Configuration .....................................................................................................27
6. Drive Slot Arrangement: Enclosure Front View ...............................................................................33
7. Power Supply LEDs .........................................................................................................................40
8. Cooling Module LED .......................................................................................................................40
9. Ops Panel LED States .....................................................................................................................41
10. SR1202 RAID Controller Module LEDs ...........................................................................................42
11. Drive Carrier LED Functions ............................................................................................................43

6 Contents
Figures
1. Drive Carrier Module Caution Label ..................................................................................................8
2. Chassis Warning Label: Weight Hazard ............................................................................................8
3. SR1202 RAID Controller Module Caution Label: Do not operate with modules missing ..................9
4. Battery Module Caution Label: Do not operate with modules missing .............................................9
5. Fan Module Caution Label: Do not operate with modules missing ..................................................9
6. PSU Ratings Label .............................................................................................................................9
7. Power Supply Module Caution Label: Do not operate with modules missing ................................10
8. PSU Warning Label: Power Harzard ................................................................................................10
9. PSU Safety Label: Electric Shock Hazard Inside .............................................................................10
10. SR1202 Enclosure ...........................................................................................................................13
11. Enclosure Chassis (Front) ................................................................................................................15
12. Enclosure Chassis (Rear) .................................................................................................................15
13. Ops Panel ........................................................................................................................................15
14. AC Power Supply Module ...............................................................................................................17
15. Cooling Module Fault LED Label .....................................................................................................18
16. Cooling Module ...............................................................................................................................19
17. SR1202 RAID Controller Module .....................................................................................................20
18. SR1202 Module Front Panel ...........................................................................................................20
19. Battery Module ...............................................................................................................................21
20. Enclosure Rear View .......................................................................................................................22
21. Drive Carrier Module .......................................................................................................................22
22. Anti-tamper Lock .............................................................................................................................23
23. Module locations .............................................................................................................................27
24. Rack Mounting Rail Kit ....................................................................................................................29
25. Single Host Dual Controller Connections ........................................................................................31
26. Dual Host Dual Controller Connections ...........................................................................................31
27. Dual Host Dual Controller Connections (Single HBA) ......................................................................32
28. Dual Host Dual Controller and Single Switch Connections (Dual HBA) ...........................................32
29. Dual Host Dual Controller and Dual Switch Connections ................................................................32
30. SR1202 Enclosure Expansion Configuration ...................................................................................33
31. Activating the Anti-tamper Lock ......................................................................................................34
32. Ops Panel ........................................................................................................................................40
33. Drive Carrier LEDs ...........................................................................................................................43
34. Removing an AC Power Supply Module .........................................................................................47
35. Inserting an AC Power Supply .........................................................................................................48
36. Cooling Module Latch .....................................................................................................................48
37. Removing a Cooling Module ...........................................................................................................49
38. Cooling Module Installation .............................................................................................................50
39. Removing an SR1202 RAID Controller Module (1) ..........................................................................51
40. Removing an SR1202 RAID Controller Module (2) ..........................................................................51
41. SR1202 RAID Controller Module Latch Operation ..........................................................................52
42. Installing a SR1202 RAID Controller Module (step 2) ......................................................................52
43. Installing a SR1202 RAID Controller Module (step 2) ......................................................................53
44. Removing a Battery Module ............................................................................................................54
45. Battery Assembly Installation ..........................................................................................................54
46. Removing a Drive Carrier Module (step 1) ......................................................................................55
47. Removing a Drive Carrier Module (step 3) ......................................................................................56
48. Drive Carrier Module with Handle Released ...................................................................................57
49. Installing a Drive Carrier Module (step 2) ........................................................................................57
50. Engaging a Drive Carrier Module in an Enclosure ...........................................................................58

7MAXDATA SR1202 M1 – Technical User Guide
1 Preface
Notices
The information in this document is subject to change without notice.
While every effort has been made to ensure that all information in this document is accurate, the
Authors accept no liability for any errors that may arise.
No part of this document may be transmitted or copied in any form, or by any means, for any purpose,
without the written permission of the Authors.
Acknowledgments
All names, brands, products or services are trademarks or registered trademarks of their respective
companies.
What is in this guide
This user guide gives you step-by-step instructions on how to install, configure and connect an SR1202
Enclosure Platform to your host computer system and how to use and maintain the system.
Who should use this guide
This user guide assumes that you have a working knowledge of the SAS-SATA environment into
which you are installing your SR1202 Enclosure Platform. If you do not have these skills, or are not
confident with the instructions in this guide, do not proceed with the installation.
International Standards
The SR1202 Enclosure Platform complies with the requirements of the following agencies and
standards:
• CE to EN 60950
• UL
• cUL
Potential for Radio Frequency Interference
USA Federal Communications Commission (FCC)
 NOTE
This equipment has been tested and found to comply with the limits for a class A digital device,
pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case
the user will be required to correct the interference at his own expense.

8 Preface
Figure 1. Drive Carrier Module Caution Label
• Do not operate with modules missing. Spin down time 30 seconds.
• Permanently unplug the unit if you think that it has become damaged in any way and before
you move it.
• An SR1202 enclosure can weigh up to 32 kg (70.4 lb). Do not try to lift it by yourself.
Properly shielded and grounded cables and connectors must be used in order to meet FCC emission
limits. The supplier is not responsible for any radio or television interference caused by using other than
recommended cables and connectors or by unauthorized changes or modifications to this equipment.
Unauthorized changes or modifications could void the user’s authority to operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions:
(1) this device may not cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
European Regulations
This equipment complies with European Regulations EN 55022 Class A: Limits and Methods of
Measurement of Radio Disturbance Characteristics of Information Technology Equipments and
EN 50082-1: Generic Immunity.
Safety
All plug-in modules are part of the fire enclosure and must only be removed when a replacement can
be immediately added. The system must not be run without all modules in place.
! ATTENTION
In order to fully separate the system from current, power cords must be removed from the wall
outlet.
Figure 2. Chassis Warning Label: Weight Hazard
• Do not lift a SR1202 enclosure by the handles on the Power Supply modules, they are not
designed to support the weight of the enclosure.
• In order to comply with applicable safety, emission and thermal requirements no covers should
be removed and all bays must be fitted with plug-in modules.

9MAXDATA SR1202 M1 – Technical User Guide
Figure 3. SR1202 RAID Controller Module Caution Label: Do not operate with modules missing
Figure 4. Battery Module Caution Label: Do not operate with modules missing
Figure 5. Fan Module Caution Label: Do not operate with modules missing
• SR1202 enclosures must only be operated from a power supply input voltage range of 100 to
240 VAC.
Figure 6. PSU Ratings Label
The plugs on the power supply cord are used as the main disconnect device. Ensure that the socket
outlets are located near the equipment and are easily accessible.
• The equipment must be operated with two working Power Supply modules.

10 Preface10
Figure 8. PSU Warning Label: Power Harzard
• The power connection should always be disconnected prior to removal of the Power Supply
module from the enclosure.
• A safe electrical earth connection must be provided to the power cords. Check the grounding
of the enclosure before applying power.
• Provide a suitable power source with electrical overload protection to meet the requirements
laid down in the technical specification.
! WARNING
Do not remove covers from the Power Supply module. Danger of electric shock inside. Return the
Power Supply module to your supplier for repair.
Figure 9. PSU Safety Label: Electric Shock Hazard Inside
! CAUTION
If this equipment is used in a manner not specified by the manufacturer, the protection provided by
the equipment may be impaired.
Figure 7. Power Supply Module Caution Label: Do not operate with modules missing
• A faulty Power Supply module must be replaced with a fully operational module within 24
hours.
• When powered by multiple AC sources, disconnect all supply power for complete isolation.

11MAXDATA SR1202 M1 – Technical User Guide
Battery Safety
The Li-Ion battery is user replaceable, please refer to section ”Battery Module” on page 53.
! WARNING
There is a danger of explosion if the battery is incorrectly replaced.
Dispose of used batteries in accordance with the manufacturer’s instructions and national
regulations.
Expansion Connectors
! IMPORTANT
Class 1 Laser Product:
If fitted with Optical modules, the modules must be a UL (or other North American NRTL) RECOGNISED
COMPONENT and must be approved by TUV (or other European product safety test house) and the
laser in the module must comply with Laser Class 1, US 21 CFR (J) and EN 60825-1.
EMC Precautions
If passive copper cables are connected, the cable must not have a connection to a common ground/
earth point.
Rack System Precautions
The following safety requirements must be considered when the unit is mounted in a rack.
• The rack design should incorporate stabilizing features suitable to prevent the rack from tipping
or being pushed over during installation or in normal use.
• When loading a rack with the units, fill the rack from the bottom up and empty from the top
down.
• System must be operated with low pressure rear exhaust installation (Back pressure created
by rack doors and obstacles not to exceed 5 pascals [0.5 mm Water gauge])
• The rack design should take into consideration the maximum operating ambient temperature
for the unit, which is 40 °C when two Power Supply modules are fitted.
• The rack should have a safe electrical distribution system. It must provide overcurrent
protection for the unit and must not be overloaded by the total number of units installed in
the rack. Consideration of the units nameplate rating should be used when addressing these
concerns.
• The electrical distribution system must provide a reliable earth for each unit and the rack.
• Each power supply in each unit has an earth leakage current of < 1.5 mA. The design of the
electrical distribution system must take into consideration the total earth leakage current from
all the power supplies in all the units. The rack will require labelling with „HIGH LEAKAGE
CURRENT. Earth connection essential before connecting supply“.
• The rack when configured with the units must meet the safety requirements of UL 60950 and
IEC 60950.

12 Preface
ESD Precautions
! CAUTION
It is recommended that you fit and check a suitable anti-static wrist or ankle strap and observe all
conventional ESD precautions when handling SR1202 plug-in modules and components. Avoid contact
with backplane components and module connectors, etc.
Recycling of Waste Electrical and Electronic Equipment (WEEE)
At the end of the products life, all scrap/waste electrical and electronic equipment should be recycled
in accordance with National regulations applicable to the handling of hazardous/toxic electrical and
electronic waste materials.
Please contact your supplier/MAXDATA for a copy of the Recycling Procedures applicable to your
product.
! IMPORTANT
Observe all applicable safety precautions, e.g. weight restrictions, handling batteries and lasers etc.,
detailed in the preceding paragraphs when dismantling and disposing of this equipment.
Data Security
• Power down your host computer and all attached peripheral devices before beginning
installation.
• Each enclosure contains up to 12 removable disk drive modules. Disk units are fragile. Handle
them with care, and keep them away from strong magnetic fields.
• All the supplied plug-in modules, dummy carriers and blank modules must be in place for the
air to flow correctly around the enclosure and also to complete the internal circuitry.
• If the subsystem is used with plug-in modules, dummy carriers or blank modules missing for
more than a few minutes, the enclosure can overheat, causing power failure and data loss.
Such use may also invalidate the warranty.
• If you remove any drive module, you may lose data.
• If you remove a drive module, replace it immediately. If it is faulty, replace it with a drive
module of the same type and capacity
• Ensure that all disk drives are removed from the enclosure before attempting to manhandle or
move the rack installation.
• Do not abandon your backup routines. No system is completely infallible.
Special Tools and Equipment
There are no special tools required but in order to complete the assembly of some configurations
you may need the following:
• Security keys (one of these should be included with your SR1202 enclosure for use with the
drive locks).

MF 13MAXDATA SR1202 M1 – Technical User GuideIntroduction
2 Introduction
SR1202 Enclosure Platform
The SR1202 Enclosure Platform is a 2U (rack space) disk drive enclosure, housing twelve low profile
(1 inch high), 3.5 inch form factor, which can be either:
• 3.0 Gb/s direct dock SAS disk drives,
• 3.0 Gb/s direct dock SATA disk drives, or
• 3.0 Gb/s dual path SATA disk drives via an active/active SATA mux transition card.
! IMPORTANT
Mixing of SAS and SATA drives in the same enclosure is only supported in columns, i.e. Column 1
all SAS, Column 2 all SATA etc.
The system will provide up to 6 Tbytes of data storage per enclosure when 500 Gb drives are
installed.
Figure 10. SR1202 Enclosure

14 15MAXDATA SR1202 M1 – Technical User GuideIntroduction
14 15MAXDATA SR1202 M1 – Technical User GuideIntroduction
The Enclosure Core Product
The SR1202 design concept is based on an enclosure subsystem together with a set of plugin modules.
The SR1202 Enclosure Platform as supplied comprises:
• Chassis and Backplane with integral (front panel mounted) Operator’s Panel (see Figure 11)
• Up to 12 Drive Carrier Modules (see Figure 21), containing either:
– 3.0 Gb/s direct dock SAS disk drives,
– 3.0 Gb/s direct dock SATA disk drives, or
– 3.0 Gb/s dual path SATA disk drives via an active/active SATA mux transition card
• Two plug-in Power Supply Modules,100–260 V AC, 350 W (see Figure 14)
• One plug-in Cooling Fan Module
• Two plug-in SR1202 RAID Controller Modules (see Figure 17), incorporating a SR1202 RAID
Controller and a StorView® Management Module.
 NOTE
If only one SR1202 RAID Controller Module is installed then a Blank (SR1202) module must be fitted
in the unused slot.
Enclosure Chassis
The chassis consists of a sheet metal enclosure assembly containing a Backplane printed circuit board
(PCB) and module runner system.
• The chassis front panel incorporates an integral Operator’s (Ops) Panel.
• The Backplane PCB provides logic level signal and low voltage power distribution paths.
• Figure 11 and Figure 12 show front and rear views of a populated chassis respectively.
• The chassis is fitted with 19 inch Rack mounting features which enable it to be fitted to
standard 19 inch racks and uses 2 EIA units of rack space (i.e. 3.5” high).
The chassis assembly contains 12 drive bays at the front, each of which accommodates the appropriate
plug-in drive carrier module. The 12 drive bays are arranged in 3 rows of 4 drives. At the rear, the
chassis assembly contains four plug-in module bays to house two Power Supply modules, a Cooling
Fan module and two SR1202 RAID Controller Modules which are fitted horizontally (one above the
other) in the fourth bay, as shown in Figure 12
 NOTE
A drive bay is defined as the space required to house a single 1.0“ high 3.5 inch disk drive in its carrier
module. e.g. a 1 x 3 bay module would take the space of 1 drive width by 3 drive bays high (in rack
mount configuration), shown in Figure 11.

14 15MAXDATA SR1202 M1 – Technical User GuideIntroduction
14 15MAXDATA SR1202 M1 – Technical User GuideIntroduction
Figure 12. Enclosure Chassis (Rear)
Operator’s Panel
The enclosure front panel incorporates an Operator’s (Ops) Panel with four LEDs, see Figure 13. The
Ops Panel provides the user with a high level indication of the operation of the Enclosure. Please refer
to Table 9, ”Ops Panel LED States”, on page 41 for details of the LED status conditions.
! CAUTION
The Ops Panel is an integral part of the enclosure assembly and can only be replaced with a replacement
enclosure.
Enclosure replacement should only be performed by trained personnel.
Figure 13. Ops Panel
Figure 11. Enclosure Chassis (Front)

16 17MAXDATA SR1202 M1 – Technical User GuideIntroduction
16 17MAXDATA SR1202 M1 – Technical User GuideIntroduction
16
Alarms
Visible Alarms
The functional modules have associated status LEDs. The Ops Panel shows a consolidated status
for all modules.
LEDs show constant Green or Blue for good or positive indication. Constant or flashing Amber LEDs
indicate there is a fault present within that module.
Table 1. Status LEDs
LED State Description
Power On Constant Green Good or positive indication
System Fault Constant Amber: fault present Indicates a problem with a Power Supply,
Cooling or RAID Controller Module.
Refer to individual modules that contain
individual fault LEDs, see Table 7 on page
40, Table 8 on page 40 and Table 10 on
page 42
Logical Fault Constant Amber: fault present Indicates failure of a drive module. The
module failing will be indicated by the
Fault LED, see Table 11 on page 43
Box Identity Constant Blue: enclosure identity The user can illuminate this via the
Management intefaces to indicate which
enclosure requires service actions to be
performed on it.
Please refer to Table 9 on page 41 for a description of the Ops panel LED states.
Audible Alarms
The SR1202 enclosure includes an Audible Alarm which indicates when a fault state is present. The
following conditions will activate the Audible Alarm:
• Fan Fault
• Voltage out of range
• Over temperature
• Thermal overrun
• System fault
• Logical Fault
• PSU Fault
• Removal of 1 PSU
• Invalid cabling
When the Audible Alarm sounds, it may be muted by pressing the Alarm Mute push-button which is
incorporated in the enclosure front panel. Please refer to section “Audible Alarm Mute” on page 43
for more information on this function.

16 17MAXDATA SR1202 M1 – Technical User GuideIntroduction
16 17MAXDATA SR1202 M1 – Technical User GuideIntroduction
The Plug-in Modules
An SR1202 Enclosure requires the following modules for normal operation:
• 2 x 350 W AC Power Supply modules
• 1 x Cooling module
• 1 or 2 x SR1202 RAID Controller Modules
• Up to 12 Drive Carrier modules.
• Dummy Drive Carrier modules, as required.
 NOTE
No drive bays should be left completely empty, dummy carriers and/or blank modules must be fitted
in all unused bays.
AC Power Supply Module
Two 100 V–260 V AC 350 W Power Supply modules (Figure 14) are supplied mounted in the rear of
the enclosure as part of the enclosure core product.
Figure 14. AC Power Supply Module

18 19MAXDATA SR1202 M1 – Technical User GuideIntroduction
18 19MAXDATA SR1202 M1 – Technical User GuideIntroduction
PSU voltage operating ranges are nominally 115 V or 230 V AC, selected automatically.
Two LEDs mounted on the rear panel of the Power Supply module (see Figure 14) indicate the status
of the module:
Table 2. Power Supply LEDs
Power On & OK
(Green)
Module Fault
(Amber)
Status
Off Off No AC power (either PSU)
Off On No AC power (this PSU only)
Off On PSU Fault (over temp, over volts, over current, PSU fan failure)
On Off AC present, PSU on OK
On On Fan Fault
Multiple Power Supply Modules
The SR1202 must always be operated with two Power Supply modules fitted. The two Power Supply
modules operate together so that if one fails the other maintains the power supply and cooling while
you replace the faulty unit.
Module replacement should only take a few minutes to perform but must be completed within 10
minutes from removal of the failed module.
Cooling Module
The Cooling Module provides system cooling, thermal monitoring and control functions.
System airflow is from front to back of the enclosure:
• Cooling airflow passes over drives and through the midplane to a central plenum.
• The cooling module pulls air from the plenum and from the RAID Cnotroller Modules.
• The PSUs pull cooling air from the plenum at the rear of the enclosure.
 NOTE
The system must be operated with low pressure rear exhaust installation (back pressure created by
rack doors and obstacles not to exceed 5 pascals [0.5 mm water gauge])
The module incorporates an amber Cooling Module Fault LED, defined in Table 3
Table 3. Cooling Module Fault LED
Status Module Fault (Amber)
Enclosure Off - qualified by PSU and RAID Controller Module OK
lights
Off
Enclosure On - Fan OK Off
Fan Fail On
Figure 15. Cooling Module Fault LED Label

18 19MAXDATA SR1202 M1 – Technical User GuideIntroduction
18 19MAXDATA SR1202 M1 – Technical User GuideIntroduction
Figure 16. Cooling Module
SR1202 RAID Controller Module
One or two SR1202 RAID Controller Modules (according to customer configuration) are supplied
mounted in the rear of the enclosure as part of the SR1202 enclosure core product.
The plug-in SR1202 RAID Controller Modules have been designed for integration into a SR1202
enclosure, providing external FC cable interfacing with the host computer system.
The Backplane incorporates connection to each of the SAS ports within the SR1202 RAID Controller
Modules.
The SR1202 RAID Controller Module internal processor monitors error conditions on each disk drive
port.
Processors housed on the SR1202 RAID Controller Modules provide enclosure management interfacing
to devices on the Backplane, PSU, SR1202 RAID Controller Module and Ops Panel, to monitor internal
functions.These processors operate in a dual active configuration to allow failover.
The module incorporates LED indicators, shown in Figure 18. Please refer to Table 10, ”SR1202 RAID
Controller Module LEDs”, on page 42 for details of the LED status conditions.
The SR1202 RAID Controller Module operates at 4 Gb/s and has the following external ports:
• Two external ports that allow for fitting of Small Form Factor Pluggable (SFP) modules, with
autobypass at the output ports. Either of these SFP ports can be used to provide connection to
the Host controllers.
• An SFF Expansion port provides SAS expansion connections, up to a maximum of 4 additional
enclosures.
• An RJ45 10/100/BaseT Ethernet port provides networking connection.
• There is also an RS232 socket which is for service personnel or end-user use only.

20 21MAXDATA SR1202 M1 – Technical User GuideIntroduction
20 21MAXDATA SR1202 M1 – Technical User GuideIntroduction
Figure 17. SR1202 RAID Controller Module
Figure 18. SR1202 Module Front Panel
The recommended configurations are shown in sections “Fibre Channel Interace” on page 31 and
“Enclosure Expansion” on page 33.