Infotrend EonStor DS B Series User manual

Infortrend EonStor DS
B Series
Hardware Manual
Version 1.3

Copyright Notice
Copyright Notice
All rights reserved. This publication may not be reproduced, transmitted,
transcribed, stored in a retrieval system, or translated into any language or
computer language, in any form or by any means, electronic, mechanical,
magnetic, optical, chemical, manual or otherwise, without the prior written
consent of Infortrend Technology, Inc.
Disclaimer Infortrend Technology makes no representations or warranties with respect to
the contents hereof and specifically disclaims any implied warranties of
merchantability or fitness for any particular purpose. Furthermore, Infortrend
Technology reserves the right to revise this publication and to make changes
from time to time in the content hereof without obligation to notify any person of
such revisions or changes. Product specifications are also subject to change
without prior notice.
Trademarks Infortrend, the Infortrend logo, SANWatch, ESVA, EonStor, EonStor DS,
EonNAS, and EonPath are registered trademarks of Infortrend Technology, Inc.
Other names prefixed with “IFT” and “ES” are trademarks of Infortrend
Technology, Inc.
Windows is a registered trademark of Microsoft Corporation.
Mac OS X is a registered trademark of Apple Computer, Inc.
Linux is a trademark of Linus Torvalds.
All other names, brands, products or services are trademarks or registered
trademarks of their respective owners.
2

Legal Information
Legal Information
All Infortrend products, including the product customers have purchased from
Infortrend, shall be subject to the latest Standard Warranty Policy available on the
Infortrend website: http://www.infortrend.com/global/Support/Warranty
Infortrend may from time to time modify, update or upgrade the software, firmware or
any accompanying user documentation without any prior notice. Infortrend will
provide access to these new software, firmware or documentation releases from
certain download sections of our website or through our service partners. Customer
shall be responsible for maintaining updated version of the software, firmware or
other documentation by downloading or obtaining from Infortrend, and installing
designated updated code, including but not limited to firmware, microcode, basic
input/out system code, utility programs, device drivers, and diagnostics delivered
with Infortrend product.
Before installing any software, applications or components provided by a third party,
customer should ensure that they are compatible and interoperable with Infortrend
product by checking in advance with Infortrend. Customer is solely responsible for
ensuring the compatibility and interoperability of the third party’s products with
Infortrend product. Customer is further solely responsible for ensuring its systems,
software, and data are adequately backed up as a precaution against possible
failures, alternation, or loss.
For any questions of hardware/ software compatibility, and the update/ upgrade code,
customer should contact Infortrend sales representative or technical support for
assistance.
To the extent permitted by applicable laws, Infortrend shall NOT be responsible for
any interoperability or compatibility issues that may arise when (1) products, software,
or options not certified and supported by Infortrend are used; (2) configurations not
certified and supported by Infortrend are used; (3) parts intended for one system are
installed in another system of different make or model
3

Contact Information
Contact Information
Customer Support Contact your system vendor or visit the following support sites.
EonStor DS Support
ESVA Support
EonNAS Support
Headquarters
(Taiwan)
Infortrend Technology, Inc.
8F, No. 102, Sec. 3, Jhongshan Rd., Jhonghe Dist., New Taipei City 235, Taiwan
Tel: [phone] Fax: [phone] Email, Technical Support, Website
Japan Infortrend Japan, Inc.
6F Okayasu Bldg., 1-7-14 Shibaura, Minato-Ku, Tokyo, 105-0023 Japan
Tel: [phone] Fax: [phone] Email, Technical Support, Website
Americas Infortrend Corporation
435 Lakeside Dr. Sunnyvale, CA. 94085, USA
Tel: [phone] Fax: [phone] Email, Technical Support, Website
US East Coast Office
4 Northeastern Blvd. Suite 21B, Nashua, NH, 03062, USA
Tel: [phone] Fax: [phone] Email, Technical Support, Website
China Infortrend Technology, Ltd.
Room 1210, West Wing, Tower One, Junefield Plaza No.6 Xuanwumen Street, Xuanwu District,
Beijing, China
Tel: [phone] Fax: [phone] Email, Technical Support, Website
Europe (EMEA) Infortrend Europe LTD.
1 Cherrywood, Stag Oak Lane Chineham Business Park Basingstoke, Hampshire RG24 8WF, UK
Tel: [phone] Fax: [phone] Email, Technical Support, Website
Germany/ Infortrend Deutschland GmbH
Wappenhalle Business Center Konrad-Zuse-Platz 8, 81829 Munich, Germany
Tel: [phone] Fax: [phone] Email, Technical Support, Website
4

Safety Precautions
Safety Precautions
Read these instructions carefully before you install, operate, or transport the EonStor
DS RAID system and JBODs.
Installation and Operation
Install the rack cabinet and the associated equipment at a site where
the ambient temperature stays lower than
a. 35C ~ if your system have a BBU (all dual controller systems
come with BBU by default)
b. 40C ~ if your system does not have a BBU
Install the power source socket outlet near the enclosure where it is
easily accessible and ground the rack cabinet.
Secure airflow clearance inside and around the rack cabinet.
- Secure an 18 to 20cm clearance on the rear side.
- Do not cover the enclosure openings.
- Route the cables inside the rack cabinet.
- Do not leave drive bays empty as it will affect airflow efficiency.
Secure each enclosure module using its retaining screws.
Place power cords and other cables away from foot traffic. Do not place
items on top of power cords and make sure they do not rest against
data cables.
Install all modules to the enclosure before powering-on systems.
Ensure that the correct power range is being used before powering-on.
DO NOT remove covers or replaceable modules if they are not faulty.
If the system is not going to be used for a long period of time,
disconnect it from the power mains to avoid transient over-voltage.
For power source redundancy, please make sure that the two PSUs are
plugged into two different power sources (ie. different circuit breakers).
5

Service and Maintenance
Service and Maintenance
Keep the faulty module in place until you have a replacement unit; an
empty module greatly affects the airflow efficiency within the enclosure.
During service operation, place the enclosure on soft and clean surface
to prevent exterior damage. Do not place tools or other items on top.
When transporting the enclosure, repackage all disk drives separately in
the original package foam blocks. Replaceable modules can stay in the
enclosure if you are using the original package; if not, repackage them
separately as well.
Disconnect the power cords before servicing or cleaning the enclosure.
Use a slightly moistened paper sheet or cloth for cleaning. Avoid using
liquid or sprayed detergent.
When replacing components, insert them as gently as possible while
assuring full engagement. Vibration and shock can easily damage hard
drives.
Only qualified service personnel should open the enclosure.
Contact service personnel if any of the following situations occurs:
- The power cord or plug is damaged.
- The enclosure has been exposed to moisture.
- The system has not been working properly.
- The enclosure was dropped against a hard surface.
- The enclosure shows obvious signs of breakage.
To move the enclosure, more than one person might be necessary due
to its weight. Drives should be removed from the enclosure beforehand.
Important Notice
The use of Infortrend certified components is strongly recommended to ensure
compatibility, quality and normal operation with your Infortrend products. Please
contact your distributor for a list of Infortrend certified components (eg. SFP, SFP+,
HBA card, iSCSI cable, FC cable, memory module, etc.).

ESD Precautions
ESD Precautions
Handle the modules by their retention screws, ejector levers, or the
module’s metal frame/faceplate only. Avoid touching the PCB boards or
connector pins.
Use a grounded wrist strap and an anti-static work pad to discharge
static electricity when installing or operating the enclosure.
Avoid dust, debris, carpets, plastic, vinyl, and styrofoam in your work
area.
Do not remove any module or component from its anti-static bag before
installation takes place.
Drives must not be stacked on top of each other without their protective
drive trays. Even when drives are fixed in the drive trays, contacting the
exposed PCB or rear-side interface may damage the drives.

About This Manual
About This Manual
This manual introduces the hardware components of 1U and 2U, both RAID and
JBOD systems. It also describes the procedures on how to install, monitor, and
maintain them.
For specific models, please go to series.
For the following subjects, consult other resources for more information:
Components that are not user-serviceable: Contact our support sites, please see
Contact Information.
Firmware operation: Consult the Firmware User Manual in the
CD-ROM.
Software (SANWatch) operation: Consult the SANWatch User Manual
in the CD-ROM.
Revision History
Version Date Description
1.0 May, 2012
Initial release
1.1 August, 2012
Management console connection update
1.2 April, 2013
Added B24F-GR2652-4 and B24F-2852-6 models
1.3 August, 2013
Added B24F-G/R2849-4

Table of Contents
Table of Contents
Copyright Notice....................................................................................................................2
Legal Information...................................................................................................................3
Contact Information...............................................................................................................4
Safety Precautions.................................................................................................................5
About This Manual.................................................................................................................8
Table of Contents...................................................................................................................9
Introduction
Product Overview.................................................................................................................12
Model Naming Conventions ................................................................................................... 12
Model Variations...................................................................................................................13
1U Series ............................................................................................................................... 14
2U Series ............................................................................................................................... 15
Major Components................................................................................................................. 16
RAID Controller and Interface ................................................................................................ 16
JBOD Controller and Interface ............................................................................................... 16
Power supply unit (PSU) and cooling module ........................................................................ 16
The Rear Panel.....................................................................................................................17
Dual Controller Models........................................................................................................... 17
Single-Controller Models........................................................................................................18
Upgrading Single Controller to Dual Controller System ......................................................... 18
Connection between RAID and JBOD ................................................................................... 18
Chassis .................................................................................................................................19
Front Panel............................................................................................................................. 19
Rear Panel ............................................................................................................................. 20
Internal Backplane ................................................................................................................. 21
Front Panel Components.....................................................................................................22
LCD/LED Panel...................................................................................................................... 22
Chassis Ear............................................................................................................................ 24
Drive Tray............................................................................................................................... 25
Rear Panel Components......................................................................................................26
RAID Controller Modules ....................................................................................................... 26
JBOD Controllers Modules..................................................................................................... 26
Host Port of RAID Models....................................................................................................27
Fibre-Host RAID Models (BxxF Series).................................................................................. 27
SAS-Host RAID Models (BxxS Series) .................................................................................. 28
iSCSI-Host RAID Models (BxxE Series) ................................................................................ 29
Cache Backup Module (CBM) for RAID Models..................................................................... 30
PSU & Cooling Module .......................................................................................................... 31
Cooling Module (selected models only).............................................................................32
System Monitoring Features...............................................................................................33
Expansion Enclosure Support ................................................................................................ 33
I2C bus................................................................................................................................... 34
Firmware (FW) and SANWatch .............................................................................................. 34
Audible Alarms ....................................................................................................................... 34
Hot-swapping .......................................................................................................................35
Hardware Installation
Installation Prerequisites.....................................................................................................36
Installation Procedures Overview.......................................................................................37
Unpacking the System.........................................................................................................38
Box contents .......................................................................................................................... 38
Preinstalled Components ....................................................................................................... 38
Components to Be Installed ................................................................................................... 38
Installing Hard Drive(s)........................................................................................................39
Hard Drive Installation Prerequisites ...................................................................................... 39
SAS Interface......................................................................................................................... 41
9

Table of Contents
Installing the Hard Drive into Drive Tray ................................................................................. 42
Installing the Hard Drive Tray into the Enclosure ................................................................... 43
Installing CBM for RAID Models..........................................................................................44
Removing the RAID Controller ............................................................................................... 44
Installing the BBU (1U systems)............................................................................................. 45
Installing the FBM (1U systems) ............................................................................................ 45
Installing the BBU (Type I)...................................................................................................... 46
Installing the FBM (Type I) .....................................................................................................47
Installing the BBU (Type II)..................................................................................................... 48
Installing the RAID Controller .................................................................................................49
System Connection
General Considerations on Making Connections .............................................................50
Host-Side Topologies ............................................................................................................. 51
Host-Side Parameters............................................................................................................51
Maximum Concurrent Host LUN Connection (“Nexus” in SCSI) ............................................ 52
Maximum Queued I/O Count..................................................................................................53
Fibre-Host RAID Connections.............................................................................................54
Fibre-Host Components (including 10GB iSCSI) ................................................................... 55
Fibre-Host Topologies ............................................................................................................ 56
Fibre Cabling.......................................................................................................................... 57
Simple End-to-End Connection .............................................................................................. 58
DAS (Direct-Attached) Connection......................................................................................... 59
Switched Fabric Connection (Dual-Controller) ....................................................................... 61
Switched Fabric Connection (Single-Controller)..................................................................... 63
SAS-Host RAID Connections..............................................................................................65
DAS (Direct-Attached Storage) Connection with Redundant Host Path ................................. 66
DAS (Direct-Attached Storage) Connection to Two Servers................................................... 68
iSCSI-Host RAID Connections............................................................................................69
Network & Host Connection Topologies ................................................................................. 69
High Availability IP SAN with Redundant RAID Controller...................................................... 71
Single-Controller with Fault-Tolerant Path.............................................................................. 73
High Availability IP SAN (Remote Replication Enabled).........................................................74
High Availability IP SAN with Port Trunk (Remote Replication Enabled) ................................ 76
Single-Controller with Trunk ................................................................................................... 78
Hybrid Host Connections....................................................................................................79
Single Hybrid Unit Connected to FC/iSCSI Hosts .................................................................. 79
Utilizing Hybrid iSCSI ports for Data Replication.................................................................... 80
JBOD Connections ..............................................................................................................81
Expansion Links ..................................................................................................................... 82
B12x Supported / Unsupported Configuration........................................................................ 84
Configuration Rules................................................................................................................ 87
Management Console Connections ...................................................................................89
Power Connections..............................................................................................................90
Checklist ................................................................................................................................ 90
Connecting Power Cords ....................................................................................................... 91
Power On Procedure..............................................................................................................93
Power On Status Check ......................................................................................................... 94
LCD Screen............................................................................................................................ 96
Power Off Procedure.............................................................................................................. 97
System Monitoring
Monitoring Features.............................................................................................................98
Front Panel .........................................................................................................................100
LCD Keypad for RAID Models.............................................................................................. 100
LCD Panel LED Definitions ..................................................................................................101
LED Panel for JBOD Models................................................................................................ 102
Drive Tray LED..................................................................................................................... 104
Controller LED....................................................................................................................105
Controller LED for RAID Models .......................................................................................... 105
Controller LED for JBOD Models ......................................................................................... 107
Ethernet Management Port LED for RAID Models ............................................................... 108
10

Table of Contents
11
iSCSI Host Port LED ............................................................................................................ 109
Hybrid iSCSI Ports ............................................................................................................... 109
Fibre-Host Port LED for FC RAID Models............................................................................ 110
SAS-Host Port LED for SAS RAID Models .......................................................................... 111
PSU / Cooling Module LEDs..............................................................................................112
Alarms and I2C Bus...........................................................................................................113
Audible Alarms ..................................................................................................................... 113
I2C ........................................................................................................................................ 113
Restoring Default System Settings .................................................................................. 114
Restoring Default Settings ................................................................................................... 114
System Maintenance
Replacing the Controller Module(s): Single / Dual / Simultaneous Upgrade ................117
Replacing the Memory Module on RAID Systems...........................................................121
Replacing the CBM for RAID Models................................................................................123
BBU Fault Conditions and Precautions ................................................................................ 124
Replacing the BBU............................................................................................................... 125
Replacing the FBM (1U systems)......................................................................................... 127
Replacing the FBM (2U systems)......................................................................................... 128
Replacing the Power Supply Module / Cooling Module..................................................129
Detecting a Failed PSU ........................................................................................................ 129
Replacing the Power Supply Unit......................................................................................... 130
Replacing a Cooling Module.............................................................................................133
Replacing 1U RAID Systems Cooling Module...................................................................... 134
Replacing a Hard Disk Drive .............................................................................................135
Replacing the Enclosure ...................................................................................................138
Differential Diagnosis to Determine Backplane Failure ........................................................ 139
Enclosure Replacement Must Knows................................................................................... 140
Enclosure Replacement Procedure...................................................................................... 141
Appendix
Technical Specifications....................................................................................................143
Host/Drive Interface ............................................................................................................. 143
RAID Configurations for RAID Models ................................................................................. 144
Fault Tolerance for RAID models ......................................................................................... 145
Environmental Parameters................................................................................................... 146
Environmental Specifications ............................................................................................... 146
Power Supply ....................................................................................................................... 147
Power Requirements (B12x-Rxxxx) ..................................................................................... 147
Power Requirements (B12x-Gxxx) ....................................................................................... 147
Power Requirements (B24 Series)....................................................................................... 147
Pin-out.................................................................................................................................148
8 / 16 Gbps Fibre Channel Host Port Pin-out ....................................................................... 149
SAS Host Port Pin-out..........................................................................................................151
GbE iSCSI Host Port Pin-out................................................................................................ 152
DB-9 Serial Port & Cable (2U Systems)............................................................................... 153
COM1 Serial Port Cable (1U Systems) .............................................................................154
Ethernet Management Port .................................................................................................. 155
SAS (SFF-8088) Expansion Port Pin-out ............................................................................. 156
Certifications
Summary.............................................................................................................................157

EonStor DS B12/B24 Series
0
Introduction
7
Product Overview
This manual introduces both RAID and JBOD systems in 1U and 2U form factor that
support 3Gbps, 6Gbps SAS 3Gbps (SATA-II) and 6Gbps (SATA-III) drive interfaces.
The 1U/2U enclosures are designed to contain twelve and twenty-four 2.5” hard
drives, respectively. Drive capacity can be expanded by attaching expansion hard
drive enclosures (JBODs).
47
Model Naming Conventions
The naming rules for RAID and JBOD models are explained in the example below:
RAID: BXXF-Rxxxx B(A) + XX(B) + F(C) + R(D) + xxxx
JBOD: BXXS-JxxxxR B(A) + XX(B) + S(C) + J(E) + xxxx + R(D)
Designation Description
(A) Drive type & interface: B = 2.5inch SAS-2 / SATA-II / SATA-III
(B) Number of hard drive bays: 12 or 24
(C)
Host-side interface:
F= Fibre or hybrid Fibre/ iSCSI
E= iSCSI
S= SAS or hybrid SAS/ iSCSI
(D)
Number of controllers:
R= redundant (dual)
S= single and upgradeable to dual controller
G= single and NOT upgradeable to dual controller
(E) “J” stands for JBOD.
xxxx Model number
12

EonStor DS B12/B24 Series
13
8
Model Variations
Comprised of RAID and JBOD models, the RAID systems store hard drives and
control the entire storage system while JBOD systems connect to a master RAID
system and can expand storage capacities by adding more hard drives (JBODs). All
systems are compatible with SAS-3 and SAS-6; SATA-II and SATA-III hard disk
drives.
1U RAID
1U JBOD
ESC EN T
PWR
BUSY
MUTEATTEN
2U RAID
2U JBOD

EonStor DS B12/B24 Series
48
1U Series
iSCSI (B12E) No. of host ports G(S)/R Speed HDD connectivity Configuration
2140 2/4 1Gbps 6Gbps G / R
Fibre (B12F) No. of host ports G(S)/R Speed HDD connectivity Configuration
2840 4/8 8Gbps 6Gbps G / R
SAS (B12S) No. of host ports G(S)/R Speed HDD connectivity Configuration
2240 2/4 6Gbps 6Gbps G / R
JBOD (B12S) Exp. Port type Speed HDD connectivity Configuration
J1000 8088 3Gbps 3Gbps S / R
J2000 8088 6Gbps 6Gbps G / R
G: Single controller, not upgradeable to dual controller
S: Single controller, upgradeable to dual controller
R: Dual controller
14

EonStor DS B12/B24 Series
15
49
2U Series
iSCSI (B24E) No. of host
ports G/R Speed Hybrid 1Gb iSCSI port HDD connectivity Controller Configuration
2142 2/4 1Gbps x 6Gbps G / R
Fibre (B24F) No. of host
ports G/R Speed Hybrid 1Gb iSCSI port HDD connectivity Controller Configuration
2652-4 2/4 16Gbps 2/4 6Gbps G / R
2840 4/8 8Gbps x 6Gbps G / R
2842 4/8 8Gbps 2/4 6Gbps G / R
2849-4 4/8 8Gbps x 6Gbps G / R
2852-6 4/8 8Gbps 2/4 6Gbps G / R
SAS (B24S) No. of host
ports G/R Speed Hybrid 1Gb iSCSI port HDD connectivity Controller Configuration
2240 2/4 6Gbps x 6Gbps G / R
2242 2/4 6Gbps 2 6Gbps G / R
JBOD (B24S) Exp. Port
type Speed Hybrid 1Gb iSCSI port HDD connectivity Controller Configuration
J2000 8088 6Gb
p
sx 6Gb
p
s S / R
X: Not applicable
G: Single controller, not upgradeable to dual controller
S: Single controller, upgradeable to dual controller
R: Dual controller

EonStor DS B12/B24 Series
50
Major Components
51
RAID Controller and Interface
Each RAID controller comes with a pre-installed DIMM module.
The traditional battery backup is replaced by an innovative Cache Backup Module
methodology (CBM) which consists of a battery backup unit (BBU) and flash backup
module (FBM). Cached data is quickly distributed to a flash backup module with the
support of a BBU in the event of a power outage. Because of a shorter discharge
time, BBU life expectancy is extended, and data is safely kept in flash regardless of
the traditional 72 hours limitation.
The embedded firmware features intelligent algorithms, such as power-saving
modes, variable fan speeds, and exiled drive handling, making this model a greener
choice.
52
JBOD Controller and Interface
The enclosure is managed by expander controllers that distribute data flow to
individual disk drives and report operating status through a proprietary enclosure
service via in-band protocols. The enclosure, along with other JBODs, connects to a
RAID system and serves as a building block of a scalable configuration.
In terms of supported protocols, the firmware supports communications with
enclosure devices, SAS/SATA disk drives and as RAID system featuring 6Gbps SAS
expansion ports.
In terms of physical connection, the SAS interface provides ease of cabling through
Mini-SAS connectors. Each SAS PHY physical link is capable of 3.0Gbps or 6.0Gbps
data rate. Each expander controller provides two SAS connectors with 4 PHYs each.
With a backplane adapting SAS or SATA drives, the system supports
enterprise-class SAS, cost-effective SATA-II or SATA-III disk drives, and is ideal for
adding large capacity to a storage pool.
53
Power supply unit (PSU) and cooling module
1U series: There is a cooling module in each of the two hot-swappable power supply
unit (PSU) modules that provide constant power to the system. Two additional
system cooling modules are also visible from the rear panel.
2U series: Cooling modules within the PSU protect the system from overheating,
and two hot-swappable PSU modules provide constant power to the system.
16

EonStor DS B12/B24 Series
17
9
The Rear Panel
54
Dual Controller Models
Dual controller systems are indicated by an “R” in their model number (please refer
to Model Naming Conventions). Controller A and B are indicated as shown in the
illustration below. In dual controller configuration, if one controller fails, the second
controller module will take over in a manner that is transparent to application servers.
Controller A is the primary controller which manages the entire RAID system in
normal operations. Controller B is the secondary (= redundant) controller which is
idle during normal operation and takes over the management role when Controller A
cannot function properly due to hardware error, controller module removal, etc.
If the failed Controller A restarts or a replacement is installed, Controller A will
temporarily assume the role of the secondary controller.
When the RAID system is rebooted, all system configurations revert to the default
state and Controller B returns the primary role to Controller A.

EonStor DS B12/B24 Series
55
Single-Controller Models
Single-controller models are designated by a “G” or “S” in their model number. Their
rear panel contain controller A while the other slot is covered with a dummy cage D.
56
Upgrading Single Controller to Dual Controller System
If the model name of a single controller RAID/JBOD is designated with the letter “S”,
it can be upgraded into a dual-controller configuration by adding another controller
module and firmware upgrade (see software manual). If the model name is
designated with a “G”, it is not upgradeable to a dual controller configuration.
B24S-J2000-S: Upgradeable
B12S-J2000G or B12S-G2240 : NOT upgradeable
For details, please contact your vendor for details.
57
Connection between RAID and JBOD
The following rule applies when connecting RAID and JBOD(s):
Dual-controller RAID connects to dual-controller JBOD.
Single-controller RAID connects to single-controller JBOD.
18

EonStor DS B12/B24 Series
19
10
Chassis
The RAID chassis is a rugged storage chassis divided into front and rear sections.
The chassis is designed to be installed into a rack or cabinet.
58
Front Panel
Item Description Item Description
A System status LEDs D LCD function buttons
B Rotary ID switch E LCD screen
C Hard drive slots F Mute / service button
1U RAID
A C
D
E F
1U JBOD
A
B
C
F
ESC EN T
PWR
BUSY
MUTEATTEN
2U RAID
D
A E F C
2U JBOD
0
2
4
6 8 10
12
14
A
B
F
C

EonStor DS B12/B24 Series
59
Rear Panel
Designation Description Designation Description
1 Controller A 4 Cooling Module
2 Controller B 5 Dummy cage
3 Power supply + cooling module 6
1
4
4
33
1U single controller
1
33
5
2U single controller
1 2 3
3
44
1U dual controller
1
2
3
3
2U dual controller
20