Dell EMC ME4 Series User manual

Dell EMC ME4 Series
Owner’s Manual

Notes, cautions, and warnings
NOTE: A NOTE indicates important information that helps you make better use of your product.
CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.
WARNING: A WARNING indicates a potential for property damage, personal injury, or death.
© 2018 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks
may be trademarks of their respective owners.
2018 - 12
Rev. A01

Contents
1 Storage system hardware...............................................................................................................................6
Locate the service tag.......................................................................................................................................................6
Enclosure congurations................................................................................................................................................... 6
Upgrading to dual-controller conguration............................................................................................................... 7
Enclosure management..................................................................................................................................................... 8
Management interfaces.............................................................................................................................................. 8
Operation.............................................................................................................................................................................8
Attach or remove the 2U enclosure front bezel..................................................................................................... 10
Enclosure variants............................................................................................................................................................. 11
2U12.............................................................................................................................................................................. 11
2U24..............................................................................................................................................................................11
5U84.............................................................................................................................................................................12
2U enclosure core product.............................................................................................................................................. 12
2U enclosure front panel............................................................................................................................................12
2U enclosure rear panel............................................................................................................................................. 13
5U84 enclosure core product..........................................................................................................................................16
5U84 enclosure front panel....................................................................................................................................... 17
5U84 enclosure rear panel.........................................................................................................................................17
5U84 enclosure chassis................................................................................................................................................... 21
5U84 enclosure drawers............................................................................................................................................ 21
Operator's (Ops) panel LEDs..........................................................................................................................................22
2U enclosure Ops panel............................................................................................................................................ 22
5U enclosure Ops panel............................................................................................................................................ 24
Controller and expansion modules........................................................................................................................... 25
CompactFlash.................................................................................................................................................................. 30
Supercapacitor pack.........................................................................................................................................................31
Controller failure when a single-controller is operational............................................................................................. 31
Cache Status LED – corrective action....................................................................................................................32
Transporting cache.......................................................................................................................................................... 32
2 Troubleshooting and problem solving........................................................................................................... 33
Overview...........................................................................................................................................................................33
LEDs.................................................................................................................................................................................. 33
2U enclosure LEDs.....................................................................................................................................................33
5U enclosure LEDs.................................................................................................................................................... 36
Troubleshooting 2U enclosures...................................................................................................................................... 39
PCM faults..................................................................................................................................................................40
Thermal monitoring and control............................................................................................................................... 40
Thermal alarm..............................................................................................................................................................41
Troubleshooting 5U enclosures.......................................................................................................................................41
Thermal considerations............................................................................................................................................. 42
Contents 3

CLI port connections................................................................................................................................................. 42
Fault isolation methodology...................................................................................................................................... 42
Temperature sensors....................................................................................................................................................... 45
Host I/O............................................................................................................................................................................ 45
3 Module removal and replacement................................................................................................................ 46
Overview...........................................................................................................................................................................46
ESD precautions...............................................................................................................................................................46
Preventing electrostatic discharge.......................................................................................................................... 46
Grounding methods to prevent electrostatic discharge........................................................................................46
Dealing with hardware faults...........................................................................................................................................47
Firmware updates.............................................................................................................................................................47
Conguring partner rmware update...................................................................................................................... 47
Continuous operation during replacement.................................................................................................................... 47
Shut down attached hosts..............................................................................................................................................47
Shutting down a controller module................................................................................................................................47
Using the ME Storage Manager.............................................................................................................................. 48
Using the CLI..............................................................................................................................................................48
Verifying component failure............................................................................................................................................48
Customer-replaceable units (CRUs)..............................................................................................................................49
Attach or remove the 2U enclosure front bezel.....................................................................................................50
CRU replacement for 2U chassis.............................................................................................................................50
Replacing a disk drive carrier module......................................................................................................................53
Replacing an I/O Module (IOM).............................................................................................................................. 66
Replacing a power supply unit (PSU)...................................................................................................................... 71
Replacing a fan cooling module (FCM)................................................................................................................... 73
Replacing a power cooling module (PCM)............................................................................................................. 75
Completing the component installation process.................................................................................................... 77
Verifying component operation...................................................................................................................................... 77
Using LEDs..................................................................................................................................................................77
Using management interfaces..................................................................................................................................78
Performing updates in MESM after replacing an FC or SAS HBA.............................................................................78
Removing a 2U storage enclosure chassis from the rack........................................................................................... 78
Installing the replacement 2U storage enclosure in the rack......................................................................................79
4 Events and event messages.........................................................................................................................80
Event descriptions........................................................................................................................................................... 80
Resources for diagnosing and resolving problems.................................................................................................80
Events................................................................................................................................................................................ 81
Using the trust command..............................................................................................................................................139
Events sent as indications to SMI-S clients................................................................................................................ 140
A Connecting through the CLI port using a serial cable..................................................................................141
Mini-USB Device Connection....................................................................................................................................... 142
Emulated serial port..................................................................................................................................................142
Supported host applications....................................................................................................................................143
Command-line interface.......................................................................................................................................... 143
4Contents

Device driver/special operation mode....................................................................................................................143
Microsoft Windows.................................................................................................................................................. 143
Using the CLI port and mini-USB cable—known issues on Windows...............................................................144
Using the USB CLI port and cable—known issues on Windows....................................................................... 145
B Technical specications............................................................................................................................. 146
Enclosure dimensions.....................................................................................................................................................146
Enclosure weights...........................................................................................................................................................147
Environmental requirements..........................................................................................................................................147
Power cooling module....................................................................................................................................................148
Power supply unit........................................................................................................................................................... 149
C Standards and regulations..........................................................................................................................150
International standards.................................................................................................................................................. 150
Potential for radio frequency interference.................................................................................................................. 150
European regulations..................................................................................................................................................... 150
Safety compliance..........................................................................................................................................................150
Dell EMC compliance......................................................................................................................................................151
AC power cables..............................................................................................................................................................151
Recycling of Waste Electrical and Electronic Equipment (WEEE)...........................................................................152
Contents 5

Storage system hardware
Front-end and back-end components used in ME4 Series enclosures are described herein.
Certain modules within the enclosure are replaceable as described in Module removal and replacement. Modules and other components
that can be replaced are dened below:
• CRU: Customer-replaceable Unit
• FRU: Field-replaceable Unit (requires service expertise)
These two terms are used throughout this document.
Topics:
• Locate the service tag
• Enclosure congurations
• Enclosure management
• Operation
• Enclosure variants
• 2U enclosure core product
• 5U84 enclosure core product
• 5U84 enclosure chassis
• Operator's (Ops) panel LEDs
• CompactFlash
• Supercapacitor pack
• Controller failure when a single-controller is operational
• Transporting cache
Locate the service tag
Your ME4 Series storage system is identied by a unique Service Tag and Express Service Code.
The Service Tag and Express Service Code are found on the front of the system by pulling out the information tag. Alternatively, the
information might be on a sticker on the back of the storage system chassis. This information is used to route support calls to appropriate
personnel.
NOTE: Quick Resource Locator (QRL):
• The QRL code contains information unique to your system. It can be found on the information tag and the Setting Up Your Dell
EMC ME4 Series Storage System hard copy document provided with your ME4 Series enclosure.
• Scan the QRL to get immediate access to your system information, using your smart phone or tablet.
Enclosure congurations
The storage system supports three controller enclosure congurations.
• 2U (rack space) controller enclosure (2U12)– see Figure 1. 2U12 enclosure system—front orientation and Figure 2. 2U12 enclosure
system—rear orientation: holds up to 12 low prole (1-inch high) 3.5" form factor disk drive modules in a horizontal orientation.
1
6 Storage system hardware

• 2U (rack space) controller enclosure (2U24)– see Figure 3. 2U24 enclosure system—front orientation and Figure 4. 2U24 enclosure
system—rear orientation : holds up to 24 low prole (5/8 inch high) 2.5" form factor disk drive modules in a vertical orientation.
• 5U (rack space) controller enclosure (5U84)– see Figure 5. 5U84 enclosure system—front orientation and Figure 6. 5U84 enclosure
system—rear orientation: holds up to 84 low prole (1-inch high) 3.5" form factor disk drive modules in a vertical orientation within the
disk drawer. Two vertically-stacked drawers each hold 42 disks. If used, 2.5" disks require 3.5" adapters. These same chassis form
factors are used for supported expansion enclosures.
These same chassis form factors are used for supported expansion enclosures; albeit with dierent I/O modules (IOMs). Each redundant
CRU module is hot pluggable and replaceable on site. Whereas the 2U12 and 2U24 enclosures support single or dual-IOM conguration, the
5U84 enclosure supports dual-IOM conguration exclusively. If a partner controller fails, the storage system will fail over and run on a single
controller until the redundancy is restored. For 5U84 enclosures, an IOM must be installed in each IOM slot. For 2U enclosures, an IOM
must be installed in IOM slot A, and either an IOM or IOM-blank must be installed in IOM-slot B to ensure sucient airow through the
enclosure during operation.
NOTE: Throughout this guide—and the management interfaces documents used with this guide—I/O module (IOM) is a general
term denoting either a controller module or an expansion module.
Upgrading to dual-controller conguration
You can upgrade a 2U ME4 single-controller conguration by adding a second controller in Slot B.
Controller B can be added while Controller A continues to process Host I/O requirements. However, we recommend scheduling
conguration changes during a maintenance window with low or no I/O activity.
Data is not impacted when a second Controller B is inserted into the live array, but we recommended doing a complete data backup before
proceeding.
NOTE:
• When a second controller is inserted, the redundancy setting is automatically revised from Single Controller to Active-
Active ULP (Unied LUN Presentation). No manual changes are necessary.
• If PFU (partner rmware upgrade) is enabled, when you add a second controller, the system automatically updates the rmware on
Controller B to match the rmware version on Controller A.
1 Conrm that array redundancy is congured as Single Controller Mode by entering the #show advanced-settings CLI
command.
This step will ensure that Controller A does not report Controller B as missing.
2 Remove the blank IOM from Slot B.
3 Grasp the IOM using both hands, and with the latch in the open position, orient the module and align it for insertion into the target
IOM slot.
4 Ensuring that the IOM is level, slide it into the enclosure as far as it will go.
A controller module that is only partially seated will prevent optimal performance of the controller enclosure. Verify that the controller
module is fully seated before continuing.
5 Set the module in position by manually closing the latch.
You should hear a click as the latch handle engages and secures the IOM to its connector on the back of the midplane.
6 Connect the cables.
7 Map the host ports on Controller B.
Removing a second controller
To remove a second controller and revert back to a single-controller conguration:
1 Shut down Controller B.
2 Remove the controller from the array.
Storage system hardware 7

3 Enter the #set advanced-settings single-controller CLI command.
Step 3 changes the redundancy settings to Single Controller Mode.
Enclosure management
The enclosure is mechanically and electrically compliant with the Storage Bridge Bay (SBB) v 2.1 specication. SBB IOMs actively manage
the enclosure. Each module has a SAS expander with its own storage enclosure processor (SEP) that provides a SES target for a host to
interface to through the ANSI SES Standard. If one of these modules fails, the other module continues to operate.
Management interfaces
Upon completing the hardware installation, you can access the controller module’s web-based management interface—ME Storage
Manager—to congure, monitor, and manage the storage system. The controller module also provides a CLI in support of command entry
and scripting. For details, see the Dell EMC ME4 Series Storage System CLI Guide for your system.
Operation
CAUTION: Operation of the enclosure with any CRU modules missing will disrupt the airow, and the enclosure will not receive
sucient cooling. It is essential that all slots hold modules before the enclosure system is used. Empty drive slots (bays) in 2U
enclosures must hold blank drive carrier modules.
• Read the module bay caution label axed to the module being replaced.
• Replace a defective power cooling module (PCM) with a fully operational PCM within 24 hours. Do not remove a defective PCM unless
you have a replacement model of the correct type ready for insertion.
• Before removal/replacement of a PCM or power supply unit (PSU), disconnect power supply from the module to be replaced.
• Read the hazardous voltage warning label axed to power cooling modules.
CAUTION: 5U84 enclosures only
• To prevent overturning, drawer interlocks stop users from opening both drawers at the same time. Do not attempt to force open a
drawer when the other drawer in the enclosure is already open. In a rack containing more than one 5U84 enclosure, do not open more
than one drawer per rack at a time.
• Read the hot surface label axed to the drawer. Operating temperatures inside enclosure drawers can reach 60ºC. Take care when
opening drawers and removing disk drives in carrier (DDICs).
• Due to product acoustics, ear protection should be worn during prolonged exposure to the product in operation.
• Open drawers must not be used to support any other objects or equipment.
NOTE: See Enclosure variants for details about various 2U12 enclosure options.
Figure 1. 2U12 enclosure system—front orientation
8Storage system hardware

Figure 2. 2U12 enclosure system—rear orientation
The 2U12 controller enclosure in Figure 2. 2U12 enclosure system—rear orientation is equipped with 2 controllers (4–port FC/ISCSI model
shown).
Figure 3. 2U24 enclosure system—front orientation
Figure 4. 2U24 enclosure system—rear orientation
The 2U24 controller enclosure is equipped with dual-controllers (4-port SAS model shown).
Storage system hardware 9

Figure 5. 5U84 enclosure system—front orientation
Figure 6. 5U84 enclosure system—rear orientation
The 5U84 controller enclosure is equipped with dual-controllers (4-port FC/iSCSI model shown).
Attach or remove the 2U enclosure front bezel
The 2U12 controller enclosure in Figure 7. Attaching or removing the 2U enclosure front bezel is equipped with 2 controllers (4–port FC/
ISCSI model shown).
Figure 7. Attaching or removing the 2U enclosure front bezel
10 Storage system hardware

You can attach or remove the optional 2U enclosure bezel. Locate the bezel, and while grasping it with your hands, face the front panel of
the 2U12 or 2U24 enclosure. A partial view of a 2U12 enclosure is shown in Figure 7. Attaching or removing the 2U enclosure front bezel.
1 Hook the right end of the bezel onto the right ear cover of the storage system.
2 Insert the left end of the bezel into the securing slot until the release latch snaps in place.
3 Secure the bezel with the keylock as shown in Figure 7. Attaching or removing the 2U enclosure front bezel.
To remove the bezel from the 2U enclosure, reverse the order of the preceding steps.
NOTE: See Enclosure variants for details about various enclosure options.
Enclosure variants
The 2U chassis can be congured as a controller enclosure ME4012, ME4024, or an expansion enclosure ME412/ME424 as shown in Table
1. 2U12 enclosure variants and Table 2. 2U24 enclosure variants. The 5U chassis can be congured as a controller enclosure ME4084 or an
expansion enclosure ME484 as shown in Table 3. 5U84 enclosure variants.
NOTE:
The 2U and 5U core products—including key components and CRUs–are described herein. Although many CRUs dier between the
form factors, the IOMs are common to 2U12, 2U24, and 5U84 chassis. The IOMs are introduced in 2U enclosure core product and
cross-referenced from 5U84 enclosure core product.
2U12
2U12 enclosures consist of 12 x LFF (Large Form Factor) disk drives and 12 x HFF (Hybrid Form Factor) disk drives.
Table 1. 2U12 enclosure variants
Product Conguration PCMs1IOMs2,3
ME4012 12 Gb/s direct dock LFF SAS 2 2
12 Gb/s direct dock LFF SAS 2 1
ME412 12 Gb/s direct dock LFF SAS 2 2
1-Redundant PCMs must be compatible modules of the same type (both AC).
2-Supported controller module IOMs include 4-port FC/iSCSI, 4-port HD mini-SAS, and 4-port iSCSI 10Gbase-T. Supported expansion
module IOMs are used in expansion enclosures for adding storage.
3-In single-controller congurations, the controller module installs into IOM slot A, and an IOM-blank is tted to IOM slot B.
2U24
2U24 enclosures consist of 24 x SFF (Small Form Factor) disk drives.
Table 2. 2U24 enclosure variants
Product Conguration PCMs1IOMs2,3
ME4024 12 Gb/s direct dock SFF SAS 2 2
12 Gb/s direct dock SFF SAS 2 1
Storage system hardware 11

Product Conguration PCMs1IOMs2,3
ME424 12 Gb/s direct dock SFF SAS 2 2
1-Redundant PCMs must be compatible modules of the same type (both AC).
2-Supported controller module IOMs include 4-port FC/iSCSI, 4-port HD mini-SAS, and 4-port iSCSI 10Gbase-T. Supported expansion
module IOMs are used in expansion enclosures for adding storage.
3-In single-controller congurations, the controller module installs into IOM slot A, and an IOM-blank is tted to IOM slot B.
5U84
5U84 enclosures consist of 84 x LFF or SFF disk drives held in two 42-slot vertically-stacked drawers.
Table 3. 5U84 enclosure variants
Product Conguration PSUs1FCMs2IOMs3
ME4084 12 Gb/s direct dock SFF SAS 2 5 2
ME484 12 Gb/s direct dock SFF SAS 2 5 2
1-Redundant PCMs must be compatible modules of the same type (both AC).
2-The fan control module (FCM) is a separate CRU (not integrated into a PCM).
3-Supported controller module IOMs include 4-port FC/iSCSI, 4-port HD mini-SAS, and 4-port iSCSI 10Gbase-T. Supported expansion
module IOMs are used in expansion enclosures for adding storage.
2U enclosure core product
The design concept is based on an enclosure subsystem together with a set of plug-in modules.
The following gures show component locations—together with CRU slot indexing—relative to 2U enclosure front and rear panels.
2U enclosure front panel
Integers on disks indicate drive slot numbering sequence.
Figure 8. 2U12 enclosure system—front panel components
12 Storage system hardware

Figure 9. 2U24 enclosure system—front panel components
NOTE:
• For information about enclosure front panel LEDs, see 2U enclosure Ops panel.
• For information about disk LEDs for LFF and SFF disk modules, see Verify front panel LEDs.
• For information about the optional 2U enclosure front bezel, see Figure 7. Attaching or removing the 2U enclosure front bezel.
2U enclosure rear panel
Numeric designators on PCMs and alphabetic designators on IOMs indicate slot sequencing for modules used in 2U enclosures. PCM and
IOM modules are available as CRUs. The ME4 Series RBODs use 4-port controller modules. These RBODs support the ME412/ME424/
ME484 EBODs for optionally adding storage.
Figure 10. 2U controller enclosure—rear panel components (4-port FC/iSCSI)
1Power cooling module slot 0 2 Power cooling module slot 1
3 Controller module slot A 4 Controller module slot B
Figure 11. 2U controller enclosure—rear panel components (4–port iSCSI 10Gbase-T)
1Power cooling module slot 0 2 Power cooling module slot 1
3 Controller module slot A 4 Controller module slot B
Figure 12. 2U controller enclosure—rear panel components (4-port SAS)
1Power cooling module slot 0 2 Power cooling module slot 1
3 Controller module slot A 4 Controller module slot B
Storage system hardware 13

Figure 13. 2U expansion enclosure—rear panel components
1 Power cooling module slot 0 2 Power cooling module slot 1
3 Controller module slot A 4 Controller module slot B
NOTE: The preceding gures show dual-IOM conguration. Alternatively, you can congure the 2U controller enclosure with a
single-IOM. In single-controller congurations, the controller module installs into IOM slot A, and an IOM-blank is tted to IOM
slot B.
2U rear panel components
This section describes the controller module and expansion module components.
Controller module
The top slot for holding IOMs is designated A and the bottom slot is designated B. The face plate details of the IOMs show the modules
aligned for use in A. In this orientation, the IOM latch appears at the bottom of the module. It is shown in closed/locked position. The
diagrams below identify ports.
See Figure 31. LEDs: ME4 Series Storage System FC/iSCSI controller modules (FC and 10GbE SFPs) for LED identication. These
diagrams also show proper orientation for IOM insertion into slots located on the 5U84 enclosure rear panel. CNC host interface ports that
can be congured with 16Gb/s FC SFPs or 10 GbE iSCSI SFPs.
Figure 14. 4-port iSCSI 10Gbase-T controller module detail
1Back-end expansion SAS port 2 Ethernet port used by management interfaces
3 USB serial port 4 Serial ports (service only)
5 Reset 6 CNC ports (typical 2 places)
Figure 16. 4-port HD mini-SAS controller module detail shows SAS host interface ports that ship congured with 12 Gb/s HD mini-SAS
(SFF-8644) external connectors.
Figure 11. 2U controller enclosure—rear panel components (4–port iSCSI 10Gbase-T) shows iSCSI 10Gbase-T host interface ports that ship
congured with pre-installed external connectors.
14 Storage system hardware

Figure 15. 4-port FC/iSCSI controller module detail
1 Back-end expansion SAS port 2 Ethernet port used by management interfaces
3 USB serial port 4 Serial ports (service only)
5 SAS ports
Figure 16. 4-port HD mini-SAS controller module detail
1Back-end expansion SAS port 2 Ethernet port used by management interfaces
3 USB serial port 4 Serial ports (service only)
5 SAS ports
Expansion module
Figure 17. Expansion module detail ME412/ME424/ME484 shows the IOM used in supported expansion enclosures for adding storage.
Ports A/B/C ship congured with 12 Gb/s HD mini-SAS (SFF-8644) external connectors.
Figure 17. Expansion module detail ME412/ME424/ME484
1Serial port 2 SAS expansion ports
3 Disabled SAS expansion port B 4 Disabled Ethernet port
NOTE: RBOD/EBOD congurations
• When the expansion module shown in Figure 17. Expansion module detail ME412/ME424/ME484 is used with ME4 Series
controller modules for adding storage, its middle HD mini-SAS expansion port (“B”) is disabled by the rmware.
• The Ethernet port on the expansion module is not used in controller/expansion enclosure congurations, and is disabled.
Storage system hardware 15

Power cooling module
Figure 18. Power cooling module (PCM) shows the power cooling module (PCM) used in controller enclosures and optional expansion
enclosures. The PCM includes integrated cooling fans. The example shows a PCM oriented for use in the left PCM slot of the enclosure
rear panel.
Figure 18. Power cooling module (PCM)
1PCM OK LED (Green) 2 AC Fail LED (Amber/blinking amber)
3 Fan Fail LED (Amber/blinking amber) 4 DC Fail LED (Amber/blinking amber)
5On/O switch 6 Power connect
7 Release latch
LED behavior:
• If any of the PCM LEDs are illuminated amber, a module fault condition or failure has occurred.
• For a detailed description of PCM LED behavior, see 2U enclosure LEDs.
5U84 enclosure core product
Figure 19. 5U84 enclosure—front panel components and Figure 20. 5U84 enclosure system - plan view of drawer accessed from front
panel show component locations—together with CRU slot indexing—relative to the 5U84 enclosure front panel with drawers, and the rear
panel.
The 5U84 supports up to 84 DDIC modules populated within two drawers (42 DDICs per drawer; 14 DDICs per row).
NOTE:
• The 5U84 does not ship with DDICs installed. DDICs ship in a separate container, and must be installed into the enclosure drawers
during product installation and setup.
• To ensure sucient circulation and cooling throughout the enclosure, all PSU slots, cooling module slots, and IOM slots must
contain a functioning CRU. Do not replace a faulty CRU until the replacement is available and in hand.
16 Storage system hardware

5U84 enclosure front panel
Figure 19. 5U84 enclosure—front panel components
1 5U84 enclosure drawer (slot 0 = top drawer) 2 5U84 enclosure drawer (slot 1 = bottom drawer)
This gure shows a plan view of an enclosure drawer that is accessed from the enclosure front panel. The conceptual graphics are
simplied for clarity.
NOTE: SeeFigure 20. 5U84 enclosure system - plan view of drawer accessed from front panelfor 5U84 (LFF disks) DDIC LED
behavior.
Figure 20. 5U84 enclosure system - plan view of drawer accessed from front panel
1Drawer front panel (shown as an edge in plan view) 2 Direction into the enclosure drawer slot (slot 0 or 1)
5U84 enclosure rear panel
Numeric designators on PSUs (Power Supply Units) and FCMs (Fan Control Modules), and alphabetic designators on IOMs indicate slot
sequencing for modules used in 5U84 enclosures. PSU, FCM, and IOM modules are available as CRUs. All controllers use 4-port modules,
and all expansion enclosures use 3-port modules.
Storage system hardware 17

Figure 21. 5U84 controller enclosure—rear panel components (4-port FC/iSCSI)
1 Controller module slot A 2 Controller module slot B
3 FCM slot 0 4 FCM slot 1
5 FCM slot 2 6 FCM slot 3
7 FCM slot 4 8 PSU slot 0
9 PSU slot 1
Figure 22. 5U84 controller enclosure—rear panel components (4-port SAS)
1Controller module slot A 2 Controller module slot B
3 FCM slot 0 4 FCM slot 1
5 FCM slot 2 6 FCM slot 3
7 FCM slot 4 8 PSU slot 0
9 PSU slot 1
18 Storage system hardware

Figure 23. 5U84 controller enclosure—rear panel components (4-port iSCSI 10Gbase-T)
1 Controller module slot A 2 Controller module slot B
3 FCM slot 0 4 FCM slot 1
5 FCM slot 2 6 FCM slot 3
7 FCM slot 4 8 PSU slot 0
9 PSU slot 1
Figure 24. 5U84 expansion enclosure—rear panel components
1Controller module slot A 2 Controller module slot B
3 FCM slot 0 4 FCM slot 1
5 FCM slot 2 6 FCM slot 3
7 FCM slot 4 8 PSU slot 0
9 PSU slot 1
NOTE: 5U84 controller enclosures support dual-controller only. If a partner controller fails, the array will fail over and run on a
single controller until the redundancy is restored. Each IOM slot must be occupied to ensure sucient airow through the
controller during operation.
Storage system hardware 19

5U84 rear panel components
This section describes the rear-panel controller modules, expansion module, power supply module, and fan cooling module.
Controller modules
The 5U84 controller enclosure uses the same IOMs used by 2U12 and 2U24 enclosures. See Figure 21. 5U84 controller enclosure—rear
panel components (4-port FC/iSCSI) and Figure 22. 5U84 controller enclosure—rear panel components (4-port SAS).
Expansion module
The 5U84 expansion enclosure uses the same IOM used by 2U12 and 2U24 enclosures. See #unique_30/GUID-E1A44A9E-5A76-49DA-
AF3C-C5534F588303.
Power supply module
This gure shows the power supply unit used in 5U controller enclosures and optional 5U84 expansion enclosures.
Figure 25. Power supply unit (PSU)
1Module release latch 2 Handle
3 PSU Fault LED (Amber/blinking amber) 4 AC Fail LED (Amber/blinking amber)
5 Power OK LED (Green) 6 Power connect
7 Power switch
LED behavior:
• If any of the PSU LEDs are illuminated amber, a module fault condition or failure has occurred.
• For a detailed description of PSU LEDs, see Table 16. FCM LED descriptions.
The 5U84 enclosures use separate CRU modules for power supply and cooling/circulation, respectively. Figure 25. Power supply unit (PSU)
shows the power supply module, which provides the enclosure with power connection and a power switch. Figure 26. Fan cooling module
(FCM) shows the fan cooling module used in 5U84 enclosures. The FCM is smaller than the PCM, and ve of them are used within the 5U
enclosure to provide sucient airow throughout the enclosure.
NOTE: The product rating label on the PSU faceplate may show voltage of 200–240 V and current of 13 A.
Fan cooling module
Figure 26. Fan cooling module (FCM) shows the fan cooling module (FCM) used in 5U controller enclosures and optional 5U expansion
enclosures.
20 Storage system hardware