Hardware component descriptions
Disk processor enclosure
Two types of disk drive DPEs are supported:
- either 3.5-inch disk drives (hot-swappable)
- either 2.5-inch disk drives (hot-swappable)
|
Note:
Disk drives used in the 2U, 12 disk drive DPE cannot be interchanged with the disk drives from a 2U, 25 disk drive DPE.
|
|
NOTICE
When calculating the number of drives supported, the DPE is included in the total drive slot quantity.
|
Each model supports a different number of drive slots and DAEs.
- Unity 300F/350F and Unity 300 - 150 drive slots
- Unity 400F/450F and Unity 400 - 250 drive slots
- Unity 500F/550F and Unity 500 - 500 drive slots
- Unity 600F/650F and Unity 600 - 1000 drive slots
The number of DAEs supported by the Unity™ All Flash and Unity Hybrid is variable depending on the drive type in the DPE and DAEs. A Unity All Flash and Unity Hybrid system cannot be configured with more drive slots than supported and will fault the DAE that contains the slots above the system limits.
- Ten 3U, 15-drive DAEs (150 slots)
- Ten 2U, 25-drive DAEs (250 slots)
- Three 3U, 80-drive DAEs (240 slots)
General disk processor enclosure information
Drive carrier
The DPE (disk processor enclosure) comprises the following components:
- Drive carrier
- Disk drives
- Midplane
- Storage processor (SP) CPU
- SP power supply module
- EMI shielding
The disk drive carriers are metal and plastic assemblies that provide smooth, reliable contact with the enclosure slot guides and midplane connectors. Each carrier has a handle with a latch and spring clips. The latch holds the disk drive in place to ensure proper connection with the midplane. Disk drive activity/fault LEDs are located on the front of the enclosure.
Each disk drive consists of one disk drive in a carrier. You can visually distinguish between disk drive types by their different latch and handle mechanisms and by type, capacity, and speed labels on each disk drive. You can add or remove a disk drive while the DPE is powered up, but you should exercise special care when removing modules while they are in use. Disk drives are extremely sensitive electronic components.
A midplane separates the front-facing disk drives from the rear-facing SPs. It distributes power and signals to all components in the enclosure. SPs and disk drives plug directly into the midplane.
The SP assembly is the intelligent component of the DPE. Acting as the control center, each SP assembly includes status LEDs.
Each SP contains a power supply module that connect the system to an exterior power source. Each power supply includes LEDs to indicate component status. A latch on the module locks it into place to ensure proper connection.
EMI compliance requires a properly installed electromagnetic interference (EMI) shield in front of the DPE disk drives. When installed in cabinets that include a front door, the DPE includes a simple EMI shield. Other installations require a front bezel that has a locking latch and integrated EMI shield. You must remove the bezel/shield to remove and install the disk drives.
2U, 12 (3.5-inch) disk drive DPE
The following illustration shows the location of the disk drives and the status LEDs in a 2U, 12 (3.5-inch) disk drive DPE.

Location
|
Description
|
Location
|
Description
|
---|---|---|---|
![]() |
3.5-inch SAS disk drive
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![]() |
DPE power on LED (blue)
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![]() |
DPE fault LED (amber)
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Disk drive ready/activity and fault LED (blue and amber)
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The following table describes the 2U, 12 (3.5-inch) disk drive DPE and the disk drive status LEDs.
LED
|
Location
|
Color
|
State
|
Description
|
||
---|---|---|---|---|---|---|
DPE fault
|
![]() |
Amber
|
On
|
DPE fault, including SP faults.
|
||
—
|
Off
|
Normal
|
||||
DPE power
|
![]() |
Blue
|
On
|
Powering and powered up
|
||
—
|
Off
|
Powered down
|
||||
Disk drive ready/activity and fault
|
![]() |
Blue
|
On
|
Powering and powered up
|
||
Blinking, mostly on
|
Disk drive is on with I/O activity
|
|||||
Blinking at constant rate
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Disk drive is spinning up or down normally
|
|||||
Blinking, mostly off
|
Disk drive is powered up but not spinning
|
|||||
Amber
|
On
|
Fault has occurred
|
||||
—
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Off
|
Disk drive is powered down
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Product Serial Number Tag
The Product Serial Number Tag (PSNT) is a serialized label allowing EMC service to track nested hardware material in the field.
The PSNT for the 12-slot DPE is a pull-out tag that is located in the upper right side of the enclosure.

2U, 25 (2.5-inch) disk drive DPE
The following illustration shows the location of the disk drives and the status LEDs in a 2U, 25 (2.5-inch) disk drive DPE.

Location
|
Description
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Location
|
Description
|
---|---|---|---|
![]() |
2.5-inch SAS disk drive
|
![]() |
Disk drive fault LED (amber)
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![]() |
DPE fault LED (amber)
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![]() |
Disk drive ready/activity LED (blue)
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![]() |
DPE power status LED (blue)
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The following table describes the 2U, 25 (2.5-inch) disk drive DPE and the disk drive status LEDs.
LED
|
Location
|
Color
|
State
|
Description
|
---|---|---|---|---|
DPE fault
|
![]() |
—
|
Off
|
No fault has occurred, normal operation
|
Amber
|
On
|
Fault has occurred
|
||
DPE power
|
![]() |
Blue
|
On
|
Powering and powered up
|
—
|
Off
|
Powered down
|
||
Disk drive fault
|
![]() |
Amber
|
On
|
Fault has occurred
|
—
|
Off
|
No fault has occurred
|
||
Disk drive on/activity
|
![]() |
Blue
|
On
|
Powering and powered up
|
Blinking
|
Disk drive activity
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Product Serial Number Tag
The Product Serial Number Tag (PSNT) is a serialized label allowing EMC service to track nested hardware material in the field.
The PSNT for the 25-slot DPE is a pull-out tag that is located between the disk drives in slots 16 and 17.

2U DPE rear view
On the rear of the 2U DPE, viewing from top to bottom, each logical SP (B and A), consists of:
- One power supply module
- One storage processor
- up to two Ultraflex I/O modules
The following illustration shows the location of the replaceable components at the back of the DPE.

Location
|
Description
|
Location
|
Description
|
---|---|---|---|
![]() |
Power supply module (SP B)
|
![]() |
Ultraflex I/O module slots (SP B), filler modules shown
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![]() |
Storage processor assembly (SP B)
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![]() |
SP A
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Storage processor rear view
On the rear of the storage processor, viewing from left to right, are:
- Two RJ-45 LAN connectors (labeled with a network management symbol and a wrench symbol) management ports
- SP status LEDs
- One mini-HDMI port and one USB 3.0 port
- Reset button (NMI)
- Two 10-GbE ports
- Two 12-Gb/s mini-SAS HD ports
- Two integrated Converged Network Adapter (CNA) ports
The following illustration shows the location of the SP components:

Location
|
Description
|
Location
|
Description
|
---|---|---|---|
![]() |
Management LAN (RJ-45) port
|
![]() |
SP unsafe to remove LED (black with white hand)
|
![]() |
Grounding screw (required for DC-powered systems)
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![]() |
SP fault LED
|
![]() |
Torque knob for SP removal
|
![]() |
SP power LED
|
![]() |
Two converged network adapter (CNA) ports (labeled 4 and 5)
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![]() |
Non-maskable interrupt (NMI) push button (password reset button)
a
|
![]() |
Two 12 Gb/s mini-SAS HD ports (labeled 0 and 1)
|
![]() |
SP memory or boot fault LED
|
![]() |
Two 10 GbE ports (labeled 2 and 3)
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![]() |
Mini-HDMI port (not used)
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![]() |
USB 3.0 port
|
![]() |
Service LAN (RJ-45) port
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The following table describes the SP status LEDs.
LED
|
Location
|
Color
|
State
|
Description
|
||
---|---|---|---|---|---|---|
SP power LED
|
![]() |
Green
|
On
|
The SP is on main power.
|
||
Blinking (1Hz)
|
The SP is initializing a serial over LAN (SOL) session (standby mode).
|
|||||
—
|
Off
|
The SP is off.
|
||||
Unsafe to Remove LED
|
![]() |
White
|
On
|
DO NOT remove the SP.
|
||
—
|
Off
|
Safe to remove the SP without the risk of data loss when the SP has been properly prepared.
|
||||
SP fault LED
|
![]() |
Amber
|
Blinking once every four seconds (.25 Hz)
|
BIOS is running.
|
||
Blinking once every second (1 Hz)
|
POST is running.
|
|||||
Blinking four times every second (4 Hz)
|
POST completed and OS boot has started.
|
|||||
On
|
An SP fault detected.
|
|||||
Blue
|
Blinking once every four seconds (.25 Hz)
|
Operating system is booting.
|
||||
Blinking once every second (1 Hz)
|
Operating system driver is starting.
|
|||||
Blinking four times every second (4 Hz)
|
Operating system caching driver is starting.
|
|||||
On
|
|
|||||
—
|
Off
|
All operating system software has booted and SP is ready for I/O.
|
||||
Amber and blue
|
Alternating at one second intervals
|
SP is in Service mode.
|
||||
Amber then immediately blue every three seconds
|
System not initialized and no management IP address assigned.
|
|||||
SP memory or boot fault LED
|
![]() |
Amber
|
On
|
The SP cannot boot due to a memory or boot fault.
|
||
—
|
Off
|
Normal Operation.
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About converged network adapter (CNA) ports
Each SP contains two integrated CNA ports (labeled 4 and 5). These ports are PCI Express 3.0 x4 adapters that provide interfaces that can be configured as Ethernet, or Fibre Channel, but once set to a protocol, cannot be changed. If CNA ports are set to Ethernet, then you can use either 1Gb/s, 10Gb/s SFPs or Twin-AX for File (IP) or iSCSI Block access. If the ports are set to Fibre Channel, then you can use SFPs supporting 4, 8, 16 Gb/s FC multi-mode, or single-mode SFPs supporting 16Gb/s only.
|
NOTICE
Once you set the network protocol on the CNA ports you cannot switch to a different network protocol. Additionally, the four CNA ports cannot be configured independently; they must all be configured with the same network protocol. For example, if you configure the CNA ports for 10Gb/s Ethernet you cannot then later switch these ports to Fibre Channel.
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Speed
|
Protocol
|
Connection
|
---|---|---|
1 Gb/s
|
iSCSI and IP/file
|
BASE-T RJ45 Ethernet
|
10 Gb/s
|
iSCSI and IP/file
|
SFP+ or Active/Passive TwinAx
|
4/8/16 Gb/s
|
Fibre Channel
1
|
SFP+ or OM2/OM3
|
4/8 Gb/s
|
Fibre Channel
|
SFP+ or OM2/OM3
|
16 Gb/s
|
Fibre Channel (Single Mode
2)
|
SFP+ or OS1/OS2
|
1 - You may experience performance issues when directly attaching 16Gb/s FC ports to some 16Gb/s HBAs. See the
Unity Family Release Notes for more details.
|
||
2 - If there is a synchronous replication port, it can be configured as single mode and the remaining ports can be configured as multi mode.
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CNA port activity LED
The CNA activity port LED — a bi-color blue/green LED between the two CNA ports each connector — indicates the link/activity of the port. The port activity LED color depends on the protocol configured on the CNA.
- Fibre Channel CNA ports use a blue LED
- Ethernet CNA ports use a green LED
The following table describes the link/activity and connection speed associated with the CNA port LEDs.
LED
|
Color
|
State
|
Description
|
---|---|---|---|
Link/Activity
|
Green
|
On
|
Ethernet link active
|
Blinking (1 Hz)
|
Ethernet port fault
|
||
Blue
|
On
|
Fibre Channel link active
|
|
Blinking (1 Hz)
|
Fibre Channel port fault
|
||
—
|
Off
|
Link inactive (Ethernet or FC)
|
SP I/O module types
Many I/O module types are supported by the storage processor.
|
NOTICE
When adding new I/O modules, always install I/O modules in pairs—one module in SP A and one module in SP B. Both SPs must have the same type of I/O modules in the same slots.
|
Refer to Platform Overview for a details on the supported types and the system limits of storage processor I/O modules.
- Four-port 12-Gb/s SAS I/O module -- where supported, provides four mini-HD SAS ports (x16 lane) of 12Gb SAS expansion for connecting additional DAEs. This I/O module also supports controller based encryption. Labeled 12Gb SAS v1.
- Four-port 16-Gb/s Fibre Channel I/O module -- provides Fibre Channel connectivity as listed below. Labeled 16Gb Fibre v3.
- Four ports auto-negotiating to 4/8/16Gbps. Uses optical SFP+ and OM2/OM3 cabling to connect directly to a host HBA or FC switch.
- One FC port negotiating to 16Gbps, which can be configured for synchronous replication between two Unity systems, either directly connected or connected through a switch. Uses optical SFP+ and SM or MM cabling to provide synchronous replication. The three remaining ports auto-negotiate to 4/8/16 Gbps, and use optical SFP+ and OM2/OM3 cabling to connect directly to a HBA or FC switch.
- Four-port 10-Gb/s optical I/O module -- provides four SFP+ optical or Active/Passive TwinAx 10GbE IP/iSCSI ports for connections to an Ethernet switch. Supports both IP(file) and iSCSI (Block) on the same I/O module. Ports can be configured as both IP and iSCSI simultaneously. Labeled 10 GbE v5.
- Four-port 10GBASE-T I/O module -- provides four copper 10GBASE-T RJ45 Ethernet ports for copper connections to an Ethernet switch. Supports both IP (file) and iSCSI (Block) on the same IO module. Ports can be configured as both IP and iSCSI simultaneously. Labeled 10GbE BaseT v2.
- Four-port 1GBASE-T I/O module -- provides four 1000BASE-T RJ-45 copper ports for Cat 5/6-cabling connections to an Ethernet switch. Supports both IP (file) and iSCSI (Block) on the same I/O module. Ports can be configured as both IP and iSCSI simultaneously. Labeled 1 GbE BaseT v3.
- Two-port 10Gb/s optical I/O module -- provides two SFP+ optical or Active/Passive TwinAx 10GbE ports for connections to an Ethernet switch. Supports both IP (file) and full iSCSI Offload engine (Block) on the same IO module. Ports can be configured as both IP and iSCSI simultaneously. Labeled 10 GbE V6.
Detailed introduction to supported I/O modules
Overview of the supported optional I/O modules available for use in your system.
Review these sections to learn about the uses, features, ports, and LEDs for the supported optional I/O modules.
Four-port 12-Gb/s SAS
Where supported, the four-port (x16 lane) 12-Gb/s SAS I/O module comes with four x4 lane mini-SAS HD (High Density) ports, one power/fault LED, and a combination link/activity LED for each port. Install this I/O module into the SP to provide additional SAS buses. Labeled 12Gb SAS v1.
|
Note:
The optional back-end 12-Gb/s SAS module is not supported on all Unity storage systems.
|
The four-port 12-Gb/s SAS I/O module can also be configured to support x8 lane cabling for the 80-drive DAE by combining ports 0 and 1 as back-end 2, or ports 2 and 3 to create back-end 4. The I/O module can also be configured to support both x4 lane and x8 lane back-ends simultaneously.
|
Note:
If the 12-Gb/s SAS I/O module is to be configured for x8 lane cabling, the x8 lane cable must be inserted into the I/O module before persisting it. If the x8 lane cables are not inserted into the I/O module first, all four ports default to x4 lane ports.
|

Location
|
Description
|
Location
|
Description
|
---|---|---|---|
![]() |
Push button latch handle and part number label
|
![]() |
12-Gb/s mini-SAS HD port
|
![]() |
Power/fault LED
|
![]() |
Port link/activity LED
|
This four-port 12-Gb/s SAS I/O module has two different types of status LEDs.
LED
|
Location
|
Color
|
State
|
Description
|
---|---|---|---|---|
Power/Fault
|
![]() |
Green
|
On
|
I/O module is powered on.
|
Amber
|
On
|
I/O module has faulted.
|
||
—
|
Off
|
I/O module is powered off.
|
||
Link/activity
|
![]() |
Blue
|
On
|
Network connection
|
Blue
|
Blinking
|
Transmit/receive activity
|
||
—
|
Off
|
No activity
|
Four-port 16-Gb/s Fibre Channel
The four-port 16-Gb/s FC I/O module comes with four optical (fibre) ports, one power/fault LED, and a link/activity LED for each optical port. This I/O module can interface at speeds of 4, 8, and 16 Gb/s FC for host or initiator layered connections. Labeled 16Gb Fibre v3.

Location
|
Description
|
Location
|
Description
|
---|---|---|---|
![]() |
Push button latch handle and part number label
|
![]() |
16-Gb/s FC port
|
![]() |
Power/fault LED
|
![]() |
Port link/activity LED (blue)
|
This four-port 16-Gb/s FC I/O module has two different types of status LEDs.
LED
|
Location
|
Color
|
State
|
Description
|
---|---|---|---|---|
Power/Fault
|
![]() |
Green
|
On
|
I/O module is powered on.
|
Amber
|
On
|
I/O module has faulted.
|
||
—
|
Off
|
I/O module is powered off.
|
||
Link/activity
|
![]() |
Blue
|
On
|
Network connection
|
Blue
|
Blinking
|
Small form-factor pluggable (SFP+) transceiver module faulted, unsupported, or optical cable fault.
|
||
—
|
Off
|
No network connection
|
Four-port 10-Gb/s optical
The four-port 10-GbE optical SFP or active/passive TwinAx I/O module with four 10-Gb/s ports, one power/fault LED, and link/activity LED for each port. This I/O module can interface at 10 Gb/s and supports both IP(file) and iSCSI (Block) on the same IO module. Ports can be configured as both IP and iSCSI simultaneously. Labeled 10 GbE v5.

Location
|
Description
|
Location
|
Description
|
---|---|---|---|
![]() |
Push button latch handle and part number label
|
![]() |
10Gb/s optical or TwinAx Ethernet port
|
![]() |
Power/fault LED
|
![]() |
Port link/activity LED
|
This four-port 10-GbE optical SFP or active/passive TwinAx I/O module has two types of status LEDs.
LED
|
Location
|
Color
|
State
|
Description
|
---|---|---|---|---|
Power/Fault
|
![]() |
Green
|
On
|
I/O module is powered on.
|
Amber
|
On
|
I/O module has faulted.
|
||
—
|
Off
|
I/O module is powered off.
|
||
Link/activity
|
![]() |
Green
|
On
|
Network connection
|
Green
|
Blinking
|
Small form-factor pluggable (SFP+) transceiver module faulted, unsupported, or optical cable fault.
|
||
—
|
Off
|
No network connection
|
Four-port 10GBASE-T
The four-port 10-GbE BaseT I/O module comes with four 10-Gb/s RJ-45 ports, one power/fault LED, activity LED, and link LED for each port. This I/O module can interface at speeds of 1 Gb/s and 10 Gb/s and supports both IP(file) and iSCSI (Block) on the same IO module. Ports can be configured as both IP and iSCSI simultaneously. Labeled 10GbE BaseT v2.

Location
|
Description
|
Location
|
Description
|
---|---|---|---|
![]() |
Push button latch handle and part number label
|
![]() |
Link
|
![]() |
Power/fault LED
|
![]() |
Activity
|
![]() |
RJ-45 (copper) port
|
|
This four-port 10-GbE BaseT I/O module has three types of status LEDs.
LED
|
Location
|
Color
|
State
|
Description
|
---|---|---|---|---|
Power/Fault
|
![]() |
Green
|
On
|
I/O module is powered on.
|
Amber
|
On
|
I/O module has faulted.
|
||
—
|
Off
|
I/O module is powered off.
|
||
Link
|
![]() |
Green
|
On
|
Network connection
|
—
|
Off
|
No network connection
|
||
Activity
|
![]() |
Amber
|
Blinking
|
Transmit/receive activity
|
—
|
Off
|
No activity
|
Four-port 1GBASE-T
The four-port 1-GbE BaseT I/O module comes with four 1-Gb/s RJ-45 ports, one power/fault LED, activity LED, and link LED for each port. This I/O module can interface at speeds of 10 Mb/s, 100 Mb/s, and 1000 Mb/s. Supports both IP(file) and iSCSI (Block) on the same IO module. Ports can be configured as both IP and iSCSI simultaneously. Labeled 10GbE BaseT v2.

Location
|
Description
|
Location
|
Description
|
---|---|---|---|
![]() |
Push button latch handle and part number label
|
![]() |
Link
|
![]() |
Power/fault LED
|
![]() |
Activity
|
![]() |
RJ-45 (copper) port
|
|
This four-port 1-GbE BaseT I/O module has three types of status LEDs.
LED
|
Location
|
Color
|
State
|
Description
|
---|---|---|---|---|
Power/Fault
|
![]() |
Green
|
On
|
I/O module is powered on.
|
Amber
|
On
|
I/O module has faulted.
|
||
—
|
Off
|
I/O module is powered off.
|
||
Link
|
![]() |
Green
|
On
|
Network connection
|
—
|
Off
|
No network connection
|
||
Activity
|
![]() |
Amber
|
Blinking
|
Transmit/receive activity
|
—
|
Off
|
No activity
|
Two-port 10Gb/s optical
The two-port 10-Gb/s optical SFP or active/passive TwinAx I/O module with two 10-Gb/s ports, one power/fault LED, and link/activity LED for each port. This I/O module can interface at 10 Gb/s and supports full iSCSI Offload. Supports both IP (file) and full iSCSI Offload (Block) on the same IO module. Ports can be configured as both IP and iSCSI simultaneously. Labeled 10 GbE V6.

Location
|
Description
|
Location
|
Description
|
---|---|---|---|
![]() |
Push button latch handle and part number label
|
![]() |
10-Gb/s optical SFP or active TwinAx port
|
![]() |
Power/fault LED
|
![]() |
Port link/activity LED
|
This two-port 10-Gb/s optical SFP or active/passive TwinAx I/O module has two types of status LEDs.
LED
|
Location
|
Color
|
State
|
Description
|
---|---|---|---|---|
Power/Fault
|
![]() |
Green
|
On
|
I/O module is powered on.
|
Amber
|
On
|
I/O module has faulted.
|
||
—
|
Off
|
I/O module is powered off.
|
||
Link/activity
|
![]() |
Green
|
On
|
Network connection
|
Green
|
Blinking
|
Small form-factor pluggable (SFP+) transceiver module faulted, unsupported, or optical cable fault.
|
||
—
|
Off
|
No network connection
|
Small form-factor pluggable (SFP) transceiver modules
Certain I/O modules use a small form-factor pluggable plus (SFP+) transceiver module for cable connections. The SFP+ transceiver modules connect to Lucent Connector (LC) type interface (see Lucent Connector type interface for more information) optical fibre cables. These SFP+ transceiver modules are input/output (I/O) devices. These SFP+ modules are hot swappable. This means that you can install and remove an SFP+ module while the component is operating.
Figure 14 shows an example of an SFP+ module.

Location
|
Description
|
---|---|
1
|
Dust plug (protective cap)
|
2
|
Bale clasp latch
|
3
|
Send or transmit (TX) optical bore
|
4
|
Receive (RX) optical bore
|
Lucent Connector type interface
The Lucent Connector (LC) type interface was developed by Lucent Technologies (hence, Lucent Connector). It uses a push-pull mechanism. LC connectors are normally held together in a multimode duplex configuration with a plastic clip.
These cables are usually colored orange for OM2 multimode optical fiber type cables, aqua for OM3 multimode optical fiber type cables, and yellow for single mode optical fiber type cables. The multimode cables have the duplex connectors encased in a gray plastic covering. The single mode cables are encased in a blue plastic covering.
To determine the send or transmit (TX) and receive (RX) ferrules (connector ends), these cables will show a letter and numeral (for example A1 and A2 for the TX and RX, respectively) or a white and yellow rubber gasket (jacket) for the send or transmit (TX) and receive (RX) ends. Figure 15 shows an example of LC-type connectors.

Location
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Description
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---|---|
1
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Cable
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2
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Rubber gasket (jacket), send or transmit (TX)
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3
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Rubber gasket (jacket), receive (RX)
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4
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Ferrule (connector end to SFP+ module)
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SP power supply module
Figure 16 shows the SP power supply module. Each power supply includes three LEDs (AC, DC, and fault). A latch on the module locks it into place to ensure proper connection.

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NOTICE
The power supply used in your storage system must meet the storage system power requirements and must be the same type of power supply to be used in both SPs (SP A and B). You cannot mix power supply types.
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Table 24 describes the power supply (fault and power on) LEDs.
LED
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Location
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Color
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State
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Description
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---|---|---|---|---|
AC power (input)
|
![]() |
Green
|
On
|
AC Power on
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—
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Off
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AC Power off, verify source power
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||
DC power (output)
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![]() |
Green
|
On
|
DC Power on
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—
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Off
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DC Power off, verify source power
|
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Fault
|
![]() |
Amber
|
On
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Power supply or backup fault, check cable connection
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Blinking
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BIOS, POST and OS booting up or system overheating
|
|||
—
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Off
|
No fault or power off
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Storage processor internal components
Included within the SP are the following replaceable components:
- Memory modules
- Battery backup unit (BBU)
- SSD internal disk
- Cooling modules (5)
- Memory modules
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Four memory module slots reside on the SP printed circuit board (motherboard) within the SP. Depending on the model, three or four of these DIMM slots will be populated with 8 GB, 16 GB, or 32 GB DIMMs. DIMMs used in Unity systems support error-correcting code (ECC) memory.
- Batter backup unit (BBU)
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The SP includes a Lithium-ion (Li-ion) internal battery or BBU that powers the associated SP module during a power event.
- SSD internal disk
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Each SP has an internal disk on at top side of the SP motherboard and is located adjacent to cooling module 4.
- Cooling modules
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Five redundant cooling modules connect to the motherboard within the SP to provide continuous airflow through the front disks and through the rear SP to keep the DPE components at optimal operating temperatures. Within each SP assembly are two adaptive cooling zones managed by the five internal cooling modules. Cooling modules 0-2 direct airflow through zone 1 and cooling modules 3 and 4 direct airflow though zone 2.
Note: An SP will perform a protective thermal shutdown if two cooling modules fault within the same SP.