HPP Enterprises ProLiant DL360e Gen8 User manual

HPE ProLiant DL360e Gen8 Server
User Guide
Abstract
This document is for the person who installs, administers, and troubleshoots servers and storage systems. Hewlett Packard Enterprise
assumes you are qualified in the servicing of computer equipment and trained in recognizing hazards in products with hazardous energy
levels.
Part Number: 675786-005aR
January 2016
Edition: 7

© Copyright 2012, 2016 Hewlett Packard Enterprise Development LP
The information contained herein is subject to change without notice. The only warranties for Hewlett Packard Enterprise products and services
are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting
an additional warranty. Hewlett Packard Enterprise shall not be liable for technical or editorial errors or omissions contained herein.
Microsoft®, Windows®, and Windows Server® are either registered trademarks or trademarks of Microsoft Corporation in the United States
and/or other countries.

Contents 3
Contents
Component identification ....................................................................................................................... 6
Front panel components...........................................................................................................................................6
Front panel LEDs and buttons..................................................................................................................................7
Rear panel components ...........................................................................................................................................7
Rear panel LEDs and buttons ..................................................................................................................................8
PCIe riser board slot definitions ...............................................................................................................................9
System board components.......................................................................................................................................9
DIMM slot locations .....................................................................................................................................10
System maintenance switch........................................................................................................................11
NMI functionality..........................................................................................................................................11
Drive numbering .....................................................................................................................................................11
Drive LED definitions..............................................................................................................................................12
FBWC module LED definitions...............................................................................................................................13
Fan locations ..........................................................................................................................................................14
Operations ........................................................................................................................................... 15
Power up the server ...............................................................................................................................................15
Power down the server...........................................................................................................................................15
Extend the server from the rack .............................................................................................................................15
Remove the server from the rack ...........................................................................................................................16
Remove the security bezel (optional) .....................................................................................................................17
Remove the access panel ......................................................................................................................................17
Install the access panel ..........................................................................................................................................17
Remove the PCI riser cage ....................................................................................................................................18
Install the PCI riser cage ........................................................................................................................................18
Setup ................................................................................................................................................... 20
Optional services....................................................................................................................................................20
Optimum environment ............................................................................................................................................20
Space and airflow requirements..................................................................................................................20
Temperature requirements ..........................................................................................................................21
Power requirements ....................................................................................................................................21
Electrical grounding requirements ...............................................................................................................22
Connecting a DC power cable to a DC power source .................................................................................22
Server warnings and cautions ................................................................................................................................23
Rack warnings........................................................................................................................................................24
Identifying the contents of the server shipping carton ............................................................................................24
Installing hardware options.....................................................................................................................................25
Installing the server into the rack............................................................................................................................25
Powering on and selecting boot options.................................................................................................................25
Installing the operating system...............................................................................................................................26
Registering the server ............................................................................................................................................26
Hardware options installation ............................................................................................................... 27
Introduction.............................................................................................................................................................27
Security bezel option ..............................................................................................................................................27
Front video adapter option .....................................................................................................................................27
Drive options ..........................................................................................................................................................28
Drive installation guidelines.........................................................................................................................29
Installing a hot-plug drive.............................................................................................................................29
Drive cable options.................................................................................................................................................30
Two-port SATA cable option........................................................................................................................30
Mini-SAS cable option .................................................................................................................................32
Mini-SAS Y-cable option..............................................................................................................................33
Controller options ...................................................................................................................................................35

Contents 4
Installing a storage controller.......................................................................................................................35
Installing the FBWC module and capacitor pack.........................................................................................36
Optical drive option.................................................................................................................................................38
Hot-plug fan module option ....................................................................................................................................41
Fan population guidelines............................................................................................................................42
Installing a hot-plug fan module if the server is installed in a ball-bearing rail system with the cable
management arm ........................................................................................................................................42
Installing a hot-plug fan module if the server is installed in a friction rail system ........................................43
Memory options......................................................................................................................................................45
HPE SmartMemory......................................................................................................................................46
DIMM identification......................................................................................................................................47
Single-rank and dual-rank DIMMs ...............................................................................................................47
Memory subsystem architecture..................................................................................................................48
Memory protection modes ...........................................................................................................................48
Memory population guidelines.....................................................................................................................49
Installing a DIMM.........................................................................................................................................51
Processor option ....................................................................................................................................................51
Expansion board options........................................................................................................................................57
GPU power cable option ........................................................................................................................................58
HP Trusted Platform Module ..................................................................................................................................60
Installing the Trusted Platform Module board..............................................................................................61
Retaining the recovery key/password..........................................................................................................62
Enabling the Trusted Platform Module ........................................................................................................62
Redundant hot-plug power supply option...............................................................................................................63
Cabling ................................................................................................................................................ 65
Cabling overview ....................................................................................................................................................65
Storage cabling ......................................................................................................................................................65
Four-bay LFF drive cabling..........................................................................................................................65
Eight-bay SFF drive cabling ........................................................................................................................67
Optical drive cabling ...............................................................................................................................................71
GPU power cabling ................................................................................................................................................72
Software and configuration utilities ...................................................................................................... 73
Server mode...........................................................................................................................................................73
Hewlett Packard Enterprise product QuickSpecs...................................................................................................73
HPE iLO Management ...........................................................................................................................................73
HPE iLO.......................................................................................................................................................73
Intelligent Provisioning.................................................................................................................................75
HPE Insight Remote Support software........................................................................................................76
Scripting Toolkit for Windows and Linux......................................................................................................77
Service Pack for ProLiant.......................................................................................................................................77
HP Smart Update Manager .........................................................................................................................77
HPE ROM-Based Setup Utility ...............................................................................................................................77
Using RBSU ................................................................................................................................................78
Auto-configuration process..........................................................................................................................78
Boot options.................................................................................................................................................79
Configuring AMP modes..............................................................................................................................79
Re-entering the server serial number and product ID .................................................................................79
Utilities and features...............................................................................................................................................80
HPE Smart Storage Administrator...............................................................................................................80
Option ROM Configuration for Arrays..........................................................................................................80
ROMPaq utility.............................................................................................................................................80
Automatic Server Recovery.........................................................................................................................81
USB support ................................................................................................................................................81
Redundant ROM support.............................................................................................................................81
Keeping the system current....................................................................................................................................82
Drivers .........................................................................................................................................................82
Software and firmware.................................................................................................................................82
Version control.............................................................................................................................................82
Operating systems and virtualization software support for ProLiant servers...............................................83
HPE Technology Service Portfolio ..............................................................................................................83

Contents 5
Change control and proactive notification ...................................................................................................83
Troubleshooting ................................................................................................................................... 84
Troubleshooting resources.....................................................................................................................................84
System battery replacement ................................................................................................................ 85
Warranty and regulatory information .................................................................................................... 87
Warranty information ..............................................................................................................................................87
Regulatory information ...........................................................................................................................................87
Safety and regulatory compliance ...............................................................................................................87
Belarus Kazakhstan Russia marking...........................................................................................................87
Turkey RoHS material content declaration..................................................................................................88
Ukraine RoHS material content declaration ................................................................................................88
Electrostatic discharge......................................................................................................................... 89
Preventing electrostatic discharge .........................................................................................................................89
Grounding methods to prevent electrostatic discharge ..........................................................................................89
Specifications ...................................................................................................................................... 90
Environmental specifications..................................................................................................................................90
Mechanical specifications.......................................................................................................................................90
Power supply specifications ...................................................................................................................................90
HPE 460 W CS Gold Hot-plug Power Supply (92% efficiency)...................................................................91
HPE 460 W CS Platinum Plus Hot-plug Power Supply (94% efficiency) ....................................................91
HPE 750 W CS Gold Hot-plug Power Supply (92% efficiency)...................................................................91
HPE 750 W CS Platinum Plus Hot-plug Power Supply (94% efficiency) ....................................................92
HPE 750 W CS Titanium Hot-plug Power Supply (96% efficiency).............................................................92
HPE 750 W CS -48 V DC Hot-plug Power Supply (94% efficiency)............................................................93
HPE 1200 W CS Platinum Plus Hot-plug Power Supply (94% efficiency) ..................................................93
Hot-plug power supply calculations........................................................................................................................94
Support and other resources................................................................................................................ 95
Accessing Hewlett Packard Enterprise Support.....................................................................................................95
Information to collect ...................................................................................................................................95
Accessing updates .................................................................................................................................................95
Websites.................................................................................................................................................................95
Customer Self Repair .............................................................................................................................................96
Remote support....................................................................................................................................................103
Acronyms and abbreviations.............................................................................................................. 104
Documentation feedback ................................................................................................................... 108
Index.................................................................................................................................................. 109

Component identification 6
Component identification
Front panel components
•Four-bay LFF drive model
Item Description
1
Optical drive (optional)
2
Serial number/iLO information pull tab*
3
Front video connector (front video adapter, part number
655915-B21 required)
4
USB 2.0 connectors
5
LFF drives (8.89 cm, 3.5 in)
*The serial number/iLO information pull tab is double-sided. The top side shows the server serial number, and the
reverse side shows the default iLO account information. The same information is printed on a label attached to the
chassis.
•Eight-bay SFF drive model
Item Description
1
Optical drive (optional)
2
Front video connector (front video adapter, part number
655915-B21 required)
3
USB 2.0 connectors
4
Serial number/iLO information pull tab*
5
SFF drives (6.35 cm, 2.5 in)
*The serial number/iLO information pull tab is double-sided. The top side shows the server serial number, and the
reverse side shows the default iLO account information. The same information is printed on a label attached to the
chassis.

Component identification 7
Front panel LEDs and buttons
Item
Description
Status
1
UID button/LED
Solid blue = Activated
Flashing blue (1 Hz/cycle per sec) = Remote management or
firmware upgrade in progress
Off = Deactivated
2
Power On/Standby button
and system power LED
Solid green = System on
Flashing green (1 Hz/cycle per sec) = Performing power on
sequence
Solid amber = System in standby
Off = No power present*
3
Health LED
Solid green = Normal
Flashing amber = System degraded
Flashing red (1 Hz/cycle per sec) = System critical
Fast-flashing red (4 Hz/cycles per sec) = Power fault**
4
NIC status LED
Solid green = Link to network
Flashing green (1 Hz/cycle per sec) = Network active
Off = No network activity
*Facility power is not present, power cord is not attached, no power supplies are installed, power supply failure has
occurred, or the power button cable is disconnected.
**To identify components in a degraded or critical state, see the Systems Insight Display LEDs, check iLO/BIOS logs,
and reference the server troubleshooting guide.
Rear panel components

Component identification 8
Item
Description
1
Slot 1 PCIe3 x16 (16, 8, 4, 1)*
2
Slot 2 PCIe2 x8 (4,1)*
3
Power supply 2
4
Power supply 1
5
NIC connectors (4 to 1)
6
Serial connector
7
Video connector
8
USB connectors
9
iLO connector
* For more information on the riser board slots supported by the onboard PCI riser connectors, see "PCIe
riser board slot definitions (on page 9)."
Rear panel LEDs and buttons
Item Description Status
1
NIC status LED
Solid green = Activity exists
Flashing green = Activity exists
Off = No activity exists
2
NIC link LED
Green = Link exists
Off = No link exists
3
UID button LED
Solid blue = Activated
Flashing blue (1 Hz/cycle per sec) = Remote
management or firmware upgrade in process
Off = Deactivated
4
Power supply LED
Green = Normal
Off = On or more of the following conditions
exists
•
Power is unavailable
•
Power supply failed
•
Power supply is in standby mode

Component identification 9
PCIe riser board slot definitions
Slot
number
Riser board
option
Type Length Height Connecto
r link
width
Negotiable
link width
1
For riser board
options with and
without SAS
support
PCIe3
250 mm
Full
x16
x16
2
—
PCIe2
Half
Half
x8
x4
System board components
Item
Description
1
PCI riser connectors*
2
Cache module connector
3
TPM connector
4
Mini-SAS connector
5
System battery
6
SATA drive connector
7
SATA optical/storage drive connector
8
Front panel connectors
9
Processor socket 1
10
GPU power connector

Component identification 10
Item
Description
11
Fan connector 8
12
Fan connector 7
13
Fan connector 6
14
Fan connector 5
15
Fan connector 4
16
Internal USB connector
17
Fan connector 3
18
Fan connector 2
19
Fan connector 1
20
Processor 2 DIMM slots
21
Reserved
22
Drive backplane power connector
23
Processor socket 2
24
Reserved
25
Power supply connector 1
26
Drive sideband signal connector
27
Power supply connector 2
28
Processor 1 DIMM slots
29
SD card slot
30
NMI header
31
System maintenance switch
* For more information on the riser board slots supported by the onboard PCI riser connectors, see "PCIe
riser board slot definitions (on page 9)."
DIMM slot locations
DIMM slots are numbered sequentially (1 through 6) for each processor. The supported AMP modes use
the letter assignments for population guidelines.

Component identification 11
System maintenance switch
Switch
Default
Function
1
Off
Off = No function
On = iLO 4 security is disabled
2
Off
Off = System configuration can be
changed
On = System configuration is locked
5
Off
Off = Power-on password is enabled
On = Power-on password is disabled
6
Off
Off = No function
On = ROM reads configuration as
invalid
3, 4, 7, 8, 9,
10, 11, 12
—
Reserved
When the system maintenance switch position 6 is set to the On position, the system is prepared to erase
all system configuration settings from both CMOS and NVRAM.
CAUTION: Clearing CMOS and/or NVRAM deletes configuration information. Be sure to
properly configure the server or data loss could occur.
NMI functionality
An NMI crash dump creates a crash dump log before resetting a system which is not responding.
Crash dump log analysis is an essential part of diagnosing reliability problems, such as failures of
operating systems, device drivers, and applications. Many crashes freeze a system, and the only
available action for administrators is to restart the system. Resetting the system erases any information
which could support problem analysis, but the NMI feature preserves that information by performing a
memory dump before a system reset.
To force the system to invoke the NMI handler and generate a crash dump log, do one of the following:
•Use the iLO Virtual NMI feature.
•Short the NMI header ("System board components" on page 9).
For more information, see the Hewlett Packard Enterprise website
(http://www.hpe.com/support/NMI-CrashDump).
Drive numbering
•Four-bay LFF drive model
•Eight-bay SFF drive model

Component identification 12
When the two-port SATA cable is installed in the eight-bay drive cage ("Two-port SATA cable option"
on page 30), the server supports the six-drive SATA configuration. In this configuration, drive bays 1
through 6 are populated, while drive bays 7 and 8 contain drive blanks.
Drive LED definitions
Item LED Status Definition
1
Locate
Solid blue
The drive is being identified by a host application.
Flashing blue
The drive carrier firmware is being updated or requires an
update.
2
Activity ring
Rotating green
Drive activity
Off
No drive activity
3
Do not remove
Solid white
Do not remove the drive. Removing the drive causes one or
more of the logical drives to fail.
Off
Removing the drive does not cause a logical drive to fail.
4
Drive status
Solid green
The drive is a member of one or more logical drives.
Flashing green
The drive is rebuilding or performing a RAID migration, stripe
size migration, capacity expansion, or logical drive extension, or
is erasing.
Flashing
amber/green
The drive is a member of one or more logical drives and predicts
the drive will fail.
Flashing amber
The drive is not configured and predicts the drive will fail.
Solid amber
The drive has failed.
Off
The drive is not configured by a RAID controller.
IMPORTANT: When the SAS-enabled riser board with the Smart Array B320i Controller is
installed in the server, the embedded Smart Array B120i Controller is disabled automatically.
When this condition occurs:
•Drives connected to the system board operate in AHCI or Legacy mode.
•In AHCI or Legacy mode, drives cannot be a part of a hardware RAID or a logical drive.
•The Locate, Drive status, and Do not remove LEDs of the affected drives are disabled.

Component identification 13
FBWC module LED definitions
The FBWC module has three single-color LEDs (one amber and two green). The LEDs on the cache
module installed on a storage controller are duplicated on the reverse side of the module to facilitate
status viewing.
•Cache module installed on a storage controller
•Cache module installed on the system board
1 - Amber 2 - Green 3 - Green Interpretation
Off
Off
Off
The cache module is not powered.
Off
Flashing 0.5 Hz
Flashing 0.5 Hz
The cache microcontroller is executing from within its
boot loader and receiving new flash code from the host
controller.
Off
Flashing 1 Hz
Flashing 1 Hz
The cache module is powering up, and the capacitor
pack is charging.
Off
Off
Flashing 1 Hz
The cache module is idle, and the capacitor pack is
charging.
Off
Off
On
The cache module is idle, and the capacitor pack is
charged.
Off
On
On
The cache module is idle, the capacitor pack is
charged, and the cache contains data that has
not yet
been written to the drives.
Off
Flashing 1 Hz
Off
A backup is in progress.
Off
On
Off
The current backup is complete with no errors.
Flashing 1 Hz
Flashing 1 Hz
Off
The current backup failed, and data has been lost.

Component identification 14
1 - Amber
2 - Green
3 - Green
Interpretation
Flashing 1 Hz
Flashing 1 Hz
On
A power error occurred during the previous or current
boot. Data might be corrupt.
Flashing 1 Hz
On
Off
An overtemperature condition exists.
Flashing 2 Hz
Flashing 2 Hz
Off
The capacitor pack is not attached.
Flashing 2 Hz
Flashing 2 Hz
On
The capacitor has been charging for 10 minutes, but
has not reached sufficient charge to perform a full
backup.
On
On
Off
The current backup is complete, but power
fluctuations occurred during the backup.
On
On
On
The cache module microcontroller has failed.
Fan locations

Operations 15
Operations
Power up the server
1. Connect each power cord to the server.
2. Connect each power cord to the power source.
3. Press the Power On/Standby button.
The server exits standby mode and applies full power to the system. The system power LED
changes from amber to green.
Power down the server
Before powering down the server for any upgrade or maintenance procedures, perform a backup of
critical server data and programs.
WARNING: To reduce the risk of personal injury, electric shock, or damage to the equipment,
remove the power cord to remove power from the server. The front panel Power On/Standby
button does not completely shut off system power. Portions of the power supply and some
internal circuitry remain active until AC/DC power is removed.
IMPORTANT: When the server is in standby mode, auxiliary power is still being provided to
the system.
To power down the server, use one of the following methods:
•Press and release the Power On/Standby button.
This method initiates a controlled shutdown of applications and the OS before the server enters
standby mode.
•Press and hold the Power On/Standby button for more than 4 seconds to force the server to enter
standby mode.
This method forces the server to enter standby mode without properly exiting applications and the
OS. If an application stops responding, you can use this method to force a shutdown.
•Use a virtual power button selection through iLO 4.
This method initiates a controlled remote shutdown of applications and the OS before the server
enters standby mode.
Before proceeding, verify the server is in standby mode by observing that the system power LED is
amber.
Extend the server from the rack
IMPORTANT: The requirement of extending or removing the server from the rack when
performing installation and maintenance procedures depends on the rail system used:
•If using a ball-bearing rail system, you can perform most installations and maintenance by
simply extending the server from the rack.
•If using a friction rail system, to perform installations or maintenance that requires access
panel removal, remove the server from the rack.

Operations 16
To extend the server from a Hewlett Packard Enterprise, Compaq-branded, Telco, or third-party rack:
1. Power down the server (on page 15).
2. Remove all power:
a. Disconnect each power cord from the power source.
b. Disconnect each power cord from the server.
3. Disconnect all peripheral cables.
WARNING: To reduce the risk of personal injury or equipment damage, be sure that the rack
is adequately stabilized before extending a component from the rack.
WARNING: To reduce the risk of personal injury, be careful when pressing the server
rail-release latches and sliding the server into the rack. The sliding rails could pinch your
fingers.
4. Pull down the quick release levers on each side of the server.
5. Extend the server on the rack rails until the server rail-release latches engage.
If the server does not extend from the rack, use a T-25 Torx screwdriver to loosen the screws located
within the lever housing.
6. After performing the installation or maintenance procedure, slide the server into the rack. For more
information, see the documentation that ships with the rack-mounting option.
7. Connect the peripheral cables.
8. Connect each power cord to the server.
9. Connect each power cord to the power source.
Remove the server from the rack
WARNING: This server is very heavy. To reduce the risk of personal injury or damage to the
equipment:
•Observe local occupational health and safety requirements and guidelines for manual
material handling.
•Get help to lift and stabilize the product during installation or removal, especially when the
product is not fastened to the rails. Hewlett Packard Enterprise recommends that a
minimum of two people are required for all rack server installations. A third person may be
required to help align the server if the server is installed higher than chest level.
•Use caution when installing the server in or removing the server from the rack; it is unstable
when not fastened to the rails.
IMPORTANT: The requirement of extending or removing the server from the rack when
performing installation and maintenance procedures depends on the rail system used:
•If using a ball-bearing rail system, you can perform most installations and maintenance by
simply extending the server from the rack.
•If using a friction rail system, to perform installations or maintenance that requires access
panel removal, remove the server from the rack.
To remove the server from a Hewlett Packard Enterprise, Compaq-branded, Telco, or third-party rack:
1. Power down the server (on page 15).
2. Disconnect all peripheral cables and power cords from the server rear panel.
3. Extend the server from the rack (on page 15).
4. Remove the server from the rack. For more information, see the documentation that ships with the
rack mounting option.
5. Place the server on a sturdy, level surface.

Operations 17
Remove the security bezel (optional)
To access the front panel components, unlock and then remove the security bezel.
Remove the access panel
WARNING: To reduce the risk of personal injury from hot surfaces, allow the drives and the
internal system components to cool before touching them.
CAUTION: Do not operate the server for long periods with the access panel open or
removed. Operating the server in this manner results in improper airflow and improper cooling
that can lead to thermal damage.
1. Power down the server (on page 15).
2. Remove all power:
a. Disconnect each power cord from the power source.
b. Disconnect each power cord from the server.
3. Do one of the following:
oExtend the server from the rack (on page 15).
oRemove the server from the rack (on page 16).
4. Open the access panel latch, slide the access panel to the rear of the chassis, and then remove the
access panel.
If the access panel latch is locked, use a T-15 Torx screwdriver to unlock the latch.
Install the access panel
1. Place the access panel on top of the server with the access panel latch open. Allow the panel to
extend past the rear of the server by approximately 1.25 cm (0.5 inch).
2. Close the access panel latch. The access panel slides to a closed position.
3. Use a T-15 Torx screwdriver to tighten the access panel latch screw.

Operations 18
Remove the PCI riser cage
CAUTION: To prevent damage to the server or expansion boards, power down the server,
and disconnect all power cords before removing or installing the PCI riser cage.
1. Power down the server (on page 15).
2. Remove all power:
a. Disconnect each power cord from the power source.
b. Disconnect each power cord from the server.
3. Do one of the following:
oExtend the server from the rack (on page 15).
oRemove the server from the rack (on page 16).
4. Remove the access panel (on page 17).
5. Disconnect all cables connected to any existing expansion board.
6. Lift the release tabs, and then rotate them 180°counterclockwise.
7. Lift the PCI riser cage to unseat the riser boards.
Install the PCI riser cage
CAUTION: To prevent damage to the server or expansion boards, power down the server,
and disconnect all power cords before removing or installing the PCI riser cage.
1. Align the PCI riser boards with the corresponding connectors on the system board, and then press
down the PCI riser cage.

Operations 19
2. Push down the release tabs, and then rotate them 180°clockwise.
3. Install the access panel (on page 17).
4. Install the server into the rack ("Installing the server into the rack" on page 25).
5. Power up the server (on page 15).

Setup 20
Setup
Optional services
Delivered by experienced, certified engineers, HPE support services help you keep your servers up and
running with support packages tailored specifically for HPE ProLiant systems. HPE support services let
you integrate both hardware and software support into a single package. A number of service level
options are available to meet your business and IT needs.
HPE support services offer upgraded service levels to expand the standard product warranty with
easy-to-buy, easy-to-use support packages that will help you make the most of your server investments.
Some of the HPE support services for hardware, software or both are:
•Foundation Care – Keep systems running.
o6-Hour Call-to-Repair
o4-Hour 24x7
oNext Business Day
•Proactive Care – Help prevent service incidents and get you to technical experts when there is one.
o6-Hour Call-to-Repair
o4-Hour 24x7
oNext Business Day
•Startup and implementation services for both hardware and software
•HPE Education Services – Help train your IT staff.
For more information on HPE support services, see the Hewlett Packard Enterprise website
(http://www.hpe.com/services).
Optimum environment
When installing the server in a rack, select a location that meets the environmental standards described in
this section.
Space and airflow requirements
To allow for servicing and adequate airflow, observe the following space and airflow requirements when
deciding where to install a rack:
•Leave a minimum clearance of 63.5 cm (25 inches) in front of the rack.
•Leave a minimum clearance of 76.2 cm (30 inches) behind the rack.
•Leave a minimum clearance of 121.9 cm (48 inches) from the back of the rack to the back of another
rack or row of racks.
Hewlett Packard Enterprise servers draw in cool air through the front and expel warm air through the rear.
Therefore, the front and rear rack doors must be adequately ventilated to allow ambient room air to enter
the cabinet, and the rear door must be adequately ventilated to allow the warm air to escape from the
cabinet.