Lenovo ThinkSystem SR635 V3 User manual

ThinkSystem SR635 V3
System Configuration Guide
Machine Types: 7D9G, 7D9H

Note
efore using this information and the product it supports, be sure to read and understand the safety
information and the safety instructions, which are available at:
https://pubs.lenovo.com/safety_documentation/
In addition, be sure that you are familiar with the terms and conditions of the Lenovo warranty for your server,
which can be found at:
http://datacentersupport.lenovo.com/warrantylookup
Second Edition (April 2023)
© Copyright Leno o 2023.
LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services
Administration (GSA) contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-35F-
05925.

Contents
Contents . . . . . . . . . . . . . . . . . i
Safety . . . . . . . . . . . . . . . . . . iii
Safety inspection checklist . . . . . . . . . . . iv
Chapter 1. Introduction . . . . . . . . . 1
Features. . . . . . . . . . . . . . . . . . . 1
Tech Tips . . . . . . . . . . . . . . . . . . 2
Security advisories . . . . . . . . . . . . . . 3
Specifications . . . . . . . . . . . . . . . . 3
Technical specifications. . . . . . . . . . . 3
Mechanical specifications . . . . . . . . . . 8
Environmental specifications . . . . . . . . . 8
Management options. . . . . . . . . . . . . 12
Chapter 2. Ser er components . . . . 17
Front view . . . . . . . . . . . . . . . . . 17
Rear view . . . . . . . . . . . . . . . . . 23
Top view . . . . . . . . . . . . . . . . . 28
Front I/O module . . . . . . . . . . . . . . 30
System-board-assembly layout . . . . . . . . 31
System-board-assembly connectors. . . . . 33
System-board-assembly switches. . . . . . 34
System LEDs and diagnostics display . . . . . . 36
System LEDs and diagnostics display . . . . . . 36
Chapter 3. Parts list . . . . . . . . . . 37
Power cords . . . . . . . . . . . . . . . . 40
Chapter 4. Unboxing and setup . . . . 41
Server package contents . . . . . . . . . . . 41
Identify the server and access the Lenovo XClarity
Controller . . . . . . . . . . . . . . . . . 41
Server setup checklist . . . . . . . . . . . . 43
Chapter 5. System configuration . . . 45
Set the network connection for the Lenovo XClarity
Controller . . . . . . . . . . . . . . . . . 45
Set front US port for Lenovo XClarity Controller
connection. . . . . . . . . . . . . . . . . 46
Update the firmware . . . . . . . . . . . . . 47
Configure the firmware . . . . . . . . . . . . 50
Memory module configuration . . . . . . . . . 51
RAID configuration . . . . . . . . . . . . . 52
Deploy the operating system. . . . . . . . . . 52
ack up the server configuration . . . . . . . . 53
Appendix A. Getting help and
technical assistance . . . . . . . . . . 55
efore you call . . . . . . . . . . . . . . . 55
Collecting service data . . . . . . . . . . . . 56
Contacting Support . . . . . . . . . . . . . 57
Appendix B. Documents and
supports . . . . . . . . . . . . . . . . 59
Documents download . . . . . . . . . . . . 59
Support websites . . . . . . . . . . . . . . 59
Appendix C. Notices. . . . . . . . . . 61
Trademarks . . . . . . . . . . . . . . . . 62
Important notes . . . . . . . . . . . . . . . 62
Electronic emission notices . . . . . . . . . . 62
Taiwan Region SMI RoHS declaration . . . . . 63
Taiwan Region import and export contact
information . . . . . . . . . . . . . . . . 63
© Copyright Lenovo 2023 i

ii ThinkSystem SR635 V3 System Configuration Guide

Safety
efore installing this product, read the Safety Information.
Antes de instalar este produto, leia as Informações de Segurança.
在安装本产品之前，请仔细阅读 Safety Information （安全信息）。
Læs sikkerhedsforskrifterne, før du installerer dette produkt.
Lees voordat u dit product installeert eerst de veiligheidsvoorschriften.
Ennen kuin asennat tämän tuotteen, lue turvaohjeet kohdasta Safety Information.
Avant d'installer ce produit, lisez les consignes de sécurité.
Vor der Installation dieses Produkts die Sicherheitshinweise lesen.
Prima di installare questo prodotto, leggere le Informazioni sulla Sicurezza.
Les sikkerhetsinformasjonen (Safety Information) før du installerer dette produktet.
Antes de instalar este produto, leia as Informações sobre Segurança.
© Copyright Lenovo 2023 iii

Antes de instalar este producto, lea la información de seguridad.
Läs säkerhetsinformationen innan du installerar den här produkten.
Safety inspection checklist
Use the information in this section to identify potentially unsafe conditions with your server. As each machine
was designed and built, required safety items were installed to protect users and service technicians from
injury.
Note: The product is not suitable for use at visual display workplaces according to §2 of the Workplace
Regulations.
Note: The set-up of the server is made in the server room only.
CAUTION:
This equipment must be installed or ser iced by trained personnel, as defined by the NEC, IEC 62368-
1 & IEC 60950-1, the standard for Safety of Electronic Equipment within the Field of Audio/Video,
Information Technology and Communication Technology. Leno o assumes you are qualified in the
ser icing of equipment and trained in recognizing hazards energy le els in products. Access to the
equipment is by the use of a tool, lock and key, or other means of security, and is controlled by the
authority responsible for the location.
Important: Electrical grounding of the server is required for operator safety and correct system function.
Proper grounding of the electrical outlet can be verified by a certified electrician.
Use the following checklist to verify that there are no potentially unsafe conditions:
1. Make sure that the power is off and the power cord is disconnected.
2. Check the power cord.
• Make sure that the third-wire ground connector is in good condition. Use a meter to measure third-
wire ground continuity for 0.1 ohm or less between the external ground pin and the frame ground.
• Make sure that the power cord is the correct type.
To view the power cords that are available for the server:
a. Go to:
i ThinkSystem SR635 V3 System Configuration Guide

http://dcsc.lenovo.com/#/
b. Click Preconfigured Model or Configure to order.
c. Enter the machine type and model for your server to display the configurator page.
d. Click Power ➙ Power Cables to see all line cords.
• Make sure that the insulation is not frayed or worn.
3. Check for any obvious non-Lenovo alterations. Use good judgment as to the safety of any non-Lenovo
alterations.
4. Check inside the server for any obvious unsafe conditions, such as metal filings, contamination, water or
other liquid, or signs of fire or smoke damage.
5. Check for worn, frayed, or pinched cables.
6. Make sure that the power-supply cover fasteners (screws or rivets) have not been removed or tampered
with.
© Copyright Lenovo 2023

i ThinkSystem SR635 V3 System Configuration Guide

Chapter 1. Introduction
The ThinkSystem SR635 V3 Server (Types 7D9G and 7D9H) is a 1-socket 1U rack server that features the 4th
generation EPYC processor family of AMD. It is designed to be highly flexible to support many kinds of
Information Technology (IT) workloads. This high-performance, multi-core server is ideally suited for IT
environments that require superior processor performance, input/output (I/O) flexibility, and flexible
manageability.
Figure 1. ThinkSystem SR635 V3
Features
Performance, ease of use, reliability, and expansion capabilities were key considerations in the design of
your server. These design features make it possible for you to customize the system hardware to meet your
needs today and provide flexible expansion capabilities for the future.
Your server implements the following features and technologies:
• Features on Demand
If a Features on Demand feature is integrated in the server or in an optional device that is installed in the
server, you can purchase an activation key to activate the feature. For information about Features on
Demand, see:
https://fod.lenovo.com/lkms
• Leno o XClarity Controller (XCC)
The Lenovo XClarity Controller is the common management controller for Lenovo ThinkSystem server
hardware. The Lenovo XClarity Controller consolidates multiple management functions in a single chip on
the server system board (system board assembly). Some of the features that are unique to the Lenovo
XClarity Controller are enhanced performance, higher-resolution remote video, and expanded security
options.
The server supports Lenovo XClarity Controller 2 (XCC2). For additional information about Lenovo XClarity
Controller 2 (XCC2), refer to https://sysmgt.lenovofiles.com/help/topic/lxcc_frontend/lxcc_overview.html.
• UEFI-compliant ser er firmware
Lenovo ThinkSystem firmware is Unified Extensible Firmware Interface (UEFI) compliant. UEFI replaces
IOS and defines a standard interface between the operating system, platform firmware, and external
devices.
Lenovo ThinkSystem servers are capable of booting UEFI-compliant operating systems, IOS-based
operating systems, and IOS-based adapters as well as UEFI-compliant adapters.
Note: The server does not support DOS (Disk Operating System).
• Large system-memory capacity
© Copyright Lenovo 2023 1

The server supports up to 12 TruDDR5 dual inline memory modules (DIMMs) with error correcting code
(ECC). For more information about the specific types and maximum amount of memory, see “Technical
specifications” on page 3.
• Large data-storage capacity and hot-swap capability
With the hot-swap feature, you can add, remove, or replace hard disk drives without turning off the server.
Storage capacity is different depending on server model. See “Technical specifications” on page 3 for
more information.
• Lightpath Diagnostics
Lightpath Diagnostics provides LEDs to help you diagnose problems. For more information about the
Lightpath Diagnostics, see “System LEDs and diagnostics display” on page 36.
• Mobile access to Leno o Ser ice Information website
The server provides a QR code on the system service label, which is on the cover of the server, that you
can scan using a QR code reader and scanner with a mobile device to get quick access to the Lenovo
Service Information website. The Lenovo Service Information website provides additional information for
parts installation, replacement videos, and error codes for server support.
• Acti e Energy Manager
Lenovo XClarity Energy Manager is a power and temperature management solution for data centers. You
can monitor and manage the power consumption and temperature of Converged, NeXtScale, System x,
and ThinkServer servers, and improve energy efficiency using Lenovo XClarity Energy Manager.
• Redundant networking connection
The Lenovo XClarity Controller provides failover capability to a redundant Ethernet connection with the
applicable application installed. If a problem occurs with the primary Ethernet connection, all Ethernet
traffic that is associated with the primary connection is automatically switched to the optional redundant
Ethernet connection. If the applicable device drivers are installed, this switching occurs without data loss
and without user intervention.
• Redundant cooling
The redundant cooling by the fans in the server enables continued operation if one rotor of a fan fails.
• ThinkSystem RAID support
The ThinkSystem RAID adapter provides hardware redundant array of independent disks (RAID) support
to create configurations, supporting RAID levels 0, 1, 5, 6, 10, 50, and 60.
Tech Tips
Lenovo continually updates the support website with the latest tips and techniques that you can use to solve
issues that your server might encounter. These Tech Tips (also called retain tips or service bulletins) provide
procedures to work around issues or solve problems related to the operation of your server.
To find the Tech Tips available for your server:
1. Go to http://datacentersupport.lenovo.com and navigate to the support page for your server.
2. Click on the documentation icon from the navigation pane.
3. Click Documentation Type ➙ Solution from the drop-down menu.
Follow the on-screen instructions to choose the category for the problem that you are having.
2ThinkSystem SR635 V3 System Configuration Guide

Security ad isories
Lenovo is committed to developing products and services that adhere to the highest security standards in
order to protect our customers and their data. When potential vulnerabilities are reported, it is the
responsibility of the Lenovo Product Security Incident Response Team (PSIRT) to investigate and provide
information to our customers so they may put mitigation plans in place as we work toward providing
solutions.
The list of current advisories is available at the following site:
https://datacentersupport.lenovo.com/product_security/home
Specifications
Summary of the features and specifications of the server. Depending on the model, some features might not
be available, or some specifications might not apply.
Refer to the below table for specification categories and the content of each category.
Specification
category
Technical specifications Mechanical specifications Environmental specifications
Content • Processor
• Memory
• M.2 Drive
• Storage expansion
• Expansion slots
• Integrated functions and I/O
connectors
• Network
• RAID adapter
• Host bus adapter
• System fan
• Electrical input
• Minimal configuration for
debugging
• Operating systems
• Dimension
• Weight
• Acoustical noise emissions
• Ambient temperature
management
• Environmental
Technical specifications
Summary of the technical specifications of the server. Depending on the model, some features might not be
available, or some specifications might not apply. The latest specifications information is always available at
https://lenovopress.lenovo.com/.
Processor
Supports fourth-generation AMD® EPYCTM processors, with 5nm process technology.
• One processor with the new LGA 6096 (SP5) socket
• Up to 96 Zen4 cores (192 threads)
• Up to 4 xGMI3 links at up to 32 GT/s
• Maximum Configurable Thermal Design Power (cTDP): up to 400 watts
For a list of supported processors, see https://serverproven.lenovo.com.
Chapter 1.Introduction 3

Memory
See “Memory module installation rules and order” in User Guide or Hardware Maintenance Guide for detailed
information about memory configuration and setup.
• Slots: 12 memory module (DIMM) slots
• Memory module type:
– TruDDR5 4800MHz RDIMM: 16 G (1Rx8), 32 G (2Rx8)
– TruDDR5 4800MHz 10x4 RDIMM: 32 G (1Rx4), 64 G (2Rx4)
– TruDDR5 4800MHz 9x4 RDIMM: 32 G (1Rx4), 64 G (2Rx4)
– TruDDR5 4800MHz 3DS RDIMM: 128 G (4Rx4)
• Capacity:
– Minimum: 16 G (1 x 16 G RDIMM)
– Maximum: 1.5 T (12 x 128 G 3DS RDIMMs)
• Speed:
– The operating speed varies with specific processor models and UEFI settings.
– Maximum speed: 4800 MT/s
For a list of supported memory modules, see https://serverproven.lenovo.com.
Internal dri es
• Front:
– Up to four 2.5-inch hot-swap SAS/SATA drives
– Up to four 2.5-inch hot-swap NVMe drives
– Up to four 2.5-inch hot-swap Any ay drives
– Up to eight 2.5-inch hot-swap SAS/SATA drives
– Up to six 2.5-inch hot-swap SAS/SATA and four 2.5-inch hot-swap Any ay (SAS/SATA/NVMe) drives
– Up to six 2.5-inch hot-swap SAS/SATA and two 2.5-inch hot-swap Any ay (SAS/SATA/NVMe) and two 2.5-inch
hot-swap NVMe drives
– Up to ten 2.5-inch hot-swap NVMe drives
– Up to ten 2.5-inch hot-swap SAS/SATA drives
– Up to ten 2.5-inch hot-swap Any ay (SAS/SATA/NVMe) drives
– Up to 16 hot-swap EDSFF drives
• Internal:
Up to two internal SATA or NVMe M.2 drives
• Rear:
– Up to two 2.5-inch hot-swap SAS/SATA drives
– Up to two 2.5-inch hot-swap NVMe drives
– Up to two 7mm hot-swap SATA or NVMe drives
Expansion slots
Depending on the model, your server supports up to three PCIe slots in the rear.
• PCIe x16, low-profile
• PCIe x16/x16, low-profile + low-profile
• PCIe x16/x16, low profile + full-height
• PCIe x16, full-height
PCIe slot availability is based on riser selection. See “Rear view” on page 23 and “PCIe slots and PCIe adapters” in
User Guide or Hardware Maintenance Guide.
4ThinkSystem SR635 V3 System Configuration Guide

Storage controller
• SAS/SATA H A adapters
– ThinkSystem 440-8i SAS/SATA PCIe Gen4 12Gb H A
– ThinkSystem 440-16i SAS/SATA PCIe Gen4 12Gb H A
– ThinkSystem 4350-8i SAS/SATA 12Gb H A
– ThinkSystem 4350-16i SAS/SATA 12Gb H A
– ThinkSystem 440-16i SAS/SATA PCIe Gen4 12Gb Internal H A
– ThinkSystem 440-8e SAS/SATA PCIe Gen4 12Gb H A
– ThinkSystem 440-16e SAS/SATA PCIe Gen4 12Gb H A
• SAS/SATA RAID adapters
– ThinkSystem RAID 540-8i PCIe Gen4 12Gb Adapter
– ThinkSystem RAID 540-16i PCIe Gen4 12Gb Adapter
– ThinkSystem RAID 940-8i 4G Flash PCIe Gen4 12Gb Adapter
– ThinkSystem RAID 940-16i 4G Flash PCIe Gen4 12Gb Adapter
– ThinkSystem RAID 940-16i 8G Flash PCIe Gen4 12Gb Adapter
– ThinkSystem RAID 940-16i 8G Flash PCIe Gen4 12Gb Internal Adapter
– ThinkSystem RAID 940-8e 4G Flash PCIe Gen4 12Gb Adapter
– ThinkSystem RAID 5350-8i PCIe 12Gb Adapter
– ThinkSystem RAID 5350-8i PCIe 12Gb Internal Adapter
– ThinkSystem RAID 9350-8i 2G Flash PCIe 12Gb Adapter
– ThinkSystem RAID 9350-8i 2G Flash PCIe 12Gb Internal Adapter
– ThinkSystem RAID 9350-16i 4G Flash PCIe 12Gb Adapter
– ThinkSystem RAID 9350-16i 4G Flash PCIe 12Gb Internal Adapter
Notes:
Categorization of Gen 3 and Gen 4 RAID/H A adapters:
• Gen 4: 440, 540 and 940 series
• Gen 3: 4350, 5350 and 9350 series
Note:
For more information about the RAID/H A adapters, see Lenovo ThinkSystem RAID Adapter and H A Reference.
Graphics processing unit (GPU)
The server supports the following GPU:
• Low-profile, half-length, single-wide:
– NVIDIA® A2
Chapter 1.Introduction 5

Integrated functions and I/O connectors
• Lenovo XClarity Controller (XCC), which provides service processor control and monitoring functions, video
controller, and remote keyboard, video, mouse, and remote drive capabilities.
– The server supports Lenovo XClarity Controller 2 (XCC2). For additional information about Lenovo XClarity
Controller 2 (XCC2), refer to https://sysmgt.lenovofiles.com/help/topic/lxcc_frontend/lxcc_overview.html.
• Front connectors:
– (Optional) One VGA connector
– (Optional) One US 3.1 Gen 1 (5 Gbps) connector
– (Optional) One US 2.0 connector
– (Optional) One external diagnostics connector
Note: These connectors are available only when the front I/O module is installed in the server.
• Rear connectors:
– One VGA connector
– Three US 3.1 Gen 1 (5 Gbps) connectors
– One XCC system management port to connect to a systems-management network. This RJ-45 connector is
dedicated to the Lenovo XClarity Controller functions and runs at 1 Gb speed.
– Two or four Ethernet connectors on the OCP module (optional)
– (Optional) One serial port connector
Note: This connector is available when the serial port cable is installed in the server.
Network
• OCP module
Notes:
• The OCP module is an optional part. It is default to be installed on the rear and optional in the front of the server.
• If ThinkSystem Redundant System Management Port Adapter is installed on the server, it will not be displayed on
the PCIe card list of system management software, such as XCC, LXPM, and so on.
Rear button
Rear button
• NMI button
System fan
• Supports up to 7 dual-rotor hot-swap fans (including one redundant fan rotor)
• Supports the following two fan types:
– Standard fan 4056 (speed: 21000 RPM)
– Performance fan 4056 (speed: 28000 RPM)
Note: If there is an OCP module installed, when the system is powered off but still plugged in to AC power, system fan
1 and fan 2 will continue to spin at a much lower speed. This is the system design to provide proper cooling for the
OCP module.
6ThinkSystem SR635 V3 System Configuration Guide

The server supports up to two power supplies for redundancy.
Ta le 1. Electrical input for power supply units
Power supply 100-127 V ac 200-240 V ac 240 V dc -48 V dc
750-watt 80 PLUS
Platinum √ √ √
750-watt 80 PLUS
Titanium √ √
1100-watt 80 PLUS
Titanium
√ √ √
1100-watt 80 PLUS
Platinum
√ √
1800-watt 80 PLUS
Platinum
√ √
1800-watt 80 PLUS
Titanium
√ √
1100W -48V DC √
CAUTION:
• 240 V dc input (input range: 180-300 V dc) is supported in Chinese Mainland ONLY.
• Power supply with 240 V dc input cannot support hot plugging power cord function. Before remo ing the
power supply with dc input, turn off ser er or disconnect dc power sources at the breaker panel or by
turning off the power source. Then, remo e the power cord.
Minimal configuration for debugging
• One processor
• One memory module in slot 7
• One power supply
• One HDD/SSD drive or one M.2 drive (if OS is needed for debugging)
• Five system fans
Operating systems
Supported and certified operating systems:
• Microsoft Windows Server
• VMware ESXi
• Microsoft Windows
• Red Hat Enterprise Linux
• SUSE Linux Enterprise Server
• Canonical Ubuntu
References:
• Complete list of available operating systems: https://lenovopress.lenovo.com/osig.
• OS deployment instructions, see “Deploy the operating system” on page 52.
Chapter 1.Introduction 7

Mechanical specifications
Summary of the mechanical specifications of the server. Depending on the model, some features might not
be available, or some specifications might not apply.
Dimension
1U server
• Height: 43 mm (1.69 inches)
• Width (with EIA flange): 482 mm (18.97 inches)
• Depth (with EIA flange and PSU handle): 787.6 mm (31 inches)
Weight
Up to 20.2 kg (44.56 lb)
En ironmental specifications
Summary of the environmental specifications of the server. Depending on the model, some features might
not be available, or some specifications might not apply.
8ThinkSystem SR635 V3 System Configuration Guide

Acoustical noise emissions
The server has the following acoustic noise emissions declaration.
The declared sound levels are based on the following configurations, which may change depending on configurations
or conditions.
Typical GPU rich Storage rich
Sound power levels (LWAd)
Idling 6.7 el 6.7 el 7.4 el
Operating 8.4 el 8.3 el 7.9 el
Sound pressure level (LpAm)
Idling 52.3 d A 52.3 d A 59.9 d A
Operating 68.7 d A 67.7 d A 64.1 d A
Notes:
• These sound levels were measured in controlled acoustical environments according to procedures specified by
ISO7779 and are reported in accordance with ISO 9296.
• The declared acoustic sound levels are based on the following configurations, which may change depending on
configuration/conditions:
Components Typical configuration GPU rich
configuration
Storage rich
configuration
Processor One 300 W processor One 300 W processor One 240 W processor
Memory Twel e 64 GB
RDIMMs
Twel e 64 GB
RDIMMs
Twel e 64 GB
RDIMMs
Dri e Ten SAS hard disk
dri es
Ten SAS hard disk
dri es
Twel e SAS hard disk
dri es
RAID adapter One 440-16i CFF RAID
adapter
One 440-16i CFF RAID
adapter
One 440-16i CFF RAID
adapter
OCP adapter One Broadcom 5719
1GbE RJ45 4-port
OCP Ethernet adapter
One Broadcom 5719
1GbE RJ45 4-port
OCP Ethernet adapter
One Broadcom 5719
1GbE RJ45 4-port
OCP Ethernet adapter
GPU adapter None One A2 GPU adapter None
Power supply unit Two 1100 W power
supply units
Two 1100 W power
supply units
Two 750 W power
supply units
• Government regulations (such as those prescribed by OSHA or European Community Directives) may govern noise
level exposure in the workplace and may apply to you and your server installation. The actual sound pressure levels
in your installation depend upon a variety of factors, including the number of racks in the installation; the size,
materials, and configuration of the room; the noise levels from other equipment; the room ambient temperature, and
employee's location in relation to the equipment. Further, compliance with such government regulations depends
on a variety of additional factors, including the duration of employees' exposure and whether employees wear
hearing protection. Lenovo recommends that you consult with qualified experts in this field to determine whether
you are in compliance with the applicable regulations.
Chapter 1.Introduction 9

Ambient temperature management
The server is supported in the following environment:
• Air temperature:
– Operating:
– ASHRAE class H1: 5–25°C (41–77°F); when the altitude exceeds 900 m (2953 ft), the maximum ambient
temperature value decreases by 1°C (1.8°F) with every 500 m (1640 ft) of altitude increase.
– ASHRAE class A2: 10–35°C (50–95°F); when the altitude exceeds 900 m (2953 ft), the maximum ambient
temperature value decreases by 1°C (1.8°F) with every 300 m (984 ft) of altitude increase.
– ASHRAE class A3: 5–40°C (41–104°F); when the altitude exceeds 900 m (2953 ft), the maximum ambient
temperature value decreases by 1°C (1.8°F) with every 175 m (574 ft) of altitude increase.
– ASHRAE class A4: 5–45°C (41–113°F); when the altitude exceeds 900 m (2953 ft), the maximum ambient
temperature value decreases by 1°C (1.8°F) with every 125 m (410 ft) of altitude increase.
– Server off: 5–45°C (41–113°F)
– Shipping or storage: -40–60°C (-40–140°F)
• Maximum altitude: 3050 m (10 000 ft)
• Relative humidity (non-condensing):
– Operating:
– ASHRAE Class H1: 8%–80%, maximum dew point: 17°C (62.6°F)
– ASHRAE Class A2: 8%–80%, maximum dew point: 21°C (70°F)
– ASHRAE Class A3: 8%–85%, maximum dew point: 24°C (75°F)
– ASHRAE Class A4: 8%–90%, maximum dew point: 24°C (75°F)
– Shipment or storage: 8%–90%
• Particulate contamination
Attention: Airborne particulates and reactive gases acting alone or in combination with other environmental factors
such as humidity or temperature might pose a risk to the server. For information about the limits for particulates and
gases, see “Particulate contamination” on page 11.
10 ThinkSystem SR635 V3 System Configuration Guide

En ironment
ThinkSystem SR635 V3 complies with ASHRAE Class A2 specifications with most configurations, and depending on
the hardware configuration, also complies with ASHRAE Class A3 and Class A4 specifications. System performance
may be impacted when the operating temperature is outside ASHRAE A2 specification.
Depending on the hardware configuration, SR635 V3 server also complies with ASHRAE Class H1 specification.
System performance may be impacted when the operating temperature is outside ASHRAE H1 specification.
The restrictions to ASHRAE support are as follows:
• The ambient temperature must be limited to 45°C or lower (TDP ＜ 300 W) if the server meets the following
conditions:
– Installed with any TruDDR5 memory DIMM (64 G or below)
– Without 2.5" NVMe, NVMe M.2 or NVMe AIC drives
– Without rear drives or 7mm drives
– Without GPU adapters
– Without any PCIe network interface cards (NICs) at a rate equal to or above 25 G
– Without any parts with AOC and at a rate equal to or above 25 G
• The ambient temperature must be limited to 40°C or lower (TDP ＜ 240 W) if the server meets the following
conditions:
– Installed with any TruDDR5 memory DIMM (64 G or below)
– Without 2.5" NVMe, NVMe M.2 or NVMe AIC drives
– Without rear drives or 7mm drives
– Without GPU adapters
– Without any PCIe network interface cards (NICs) at a rate equal to or above 25 G
– Without any parts with AOC and at a rate equal to or above 25 G
• The ambient temperature must be limited to 35°C or lower if the server has any of the following components:
– TruDDR5 memory DIMM (128 G )
– NVMe, NVMe M.2 or NVMe AIC drives
– roadcom 57416 10G ASE-T 2-port OCP
– roadcom 57454 10G ASE-T 4-port OCP
– PCIe network interface cards (NICs) at a rate of 25 G
– Parts with AOC and at a rate of 25 G
• The ambient temperature must be limited to 30°C or lower (300 W < TDP ≤ 400 W) if the server has any of the
following components:
– Rear drives
– EDSFF drives
– GPU adapters
– Parts with AOC and at a rate higher than 25 G
– PCIe network interface cards (NICs) at a rate higher than 25 G
• The ambient temperature must be limited to 25°C or lower if the server has any of the following configurations:
– 10 x 2.5, 8 x 2.5 or 6+4 x 2.5-inch drives with 9654/9654P processor and performance heat sink
– 4 x 2.5-inch drives (using 10 x 2.5-inch chassis) with 9174F/9554/9554P processor and performance heat sink
– 7mm drives with a closed loop heat sink installed and cTDP equal to or above 320 W
For detailed thermal information, see “Thermal rules” in User Guide or Hardware Maintenance Guide.
Note: When the ambient temperature is greater than the supported max temperature (ASHARE A4 45°C), the server
will shut down. The server will not power on again until the ambient temperature falls within the supported temperature
range.
Particulate contamination
Attention: Airborne particulates (including metal flakes or particles) and reactive gases acting alone or in
combination with other environmental factors such as humidity or temperature might pose a risk to the
device that is described in this document.
Chapter 1.Introduction 11

Risks that are posed by the presence of excessive particulate levels or concentrations of harmful gases
include damage that might cause the device to malfunction or cease functioning altogether. This
specification sets forth limits for particulates and gases that are intended to avoid such damage. The limits
must not be viewed or used as definitive limits, because numerous other factors, such as temperature or
moisture content of the air, can influence the impact of particulates or environmental corrosives and gaseous
contaminant transfer. In the absence of specific limits that are set forth in this document, you must
implement practices that maintain particulate and gas levels that are consistent with the protection of human
health and safety. If Lenovo determines that the levels of particulates or gases in your environment have
caused damage to the device, Lenovo may condition provision of repair or replacement of devices or parts
on implementation of appropriate remedial measures to mitigate such environmental contamination.
Implementation of such remedial measures is a customer responsibility.
Ta le 2. Limits for particulates and gases
Contaminant Limits
Reactive gases Severity level G1 as per ANSI/ISA 71.04-19851:
• The copper reactivity level shall be less than 200 Angstroms per month (Å/month ≈ 0.0035 μg/
cm2-hour weight gain).2
• The silver reactivity level shall be less than 200 Angstroms per month (Å/month ≈ 0.0035 μg/
cm2-hour weight gain).3
• The reactive monitoring of gaseous corrosivity must be conducted approximately 5 cm (2 in.) in
front of the rack on the air inlet side at one-quarter and three-quarter frame height off the floor
or where the air velocity is much higher.
Airborne
particulates Data centers must meet the cleanliness level of ISO 14644-1 class 8.
For data centers without airside economizer, the ISO 14644-1 class 8 cleanliness might be met by
choosing one of the following filtration methods:
• The room air might be continuously filtered with MERV 8 filters.
• Air entering a data center might be filtered with MERV 11 or preferably MERV 13 filters.
For data centers with airside economizers, the choice of filters to achieve ISO class 8 cleanliness
depends on the specific conditions present at that data center.
• The deliquescent relative humidity of the particulate contamination should be more than 60%
RH.4
• Data centers must be free of zinc whiskers.5
1 ANSI/ISA-71.04-1985. Environmental conditions for process measurement and control systems: Air orne
contaminants. Instrument Society of America, Research Triangle Park, North Carolina, U.S.A.
2 The derivation of the equivalence between the rate of copper corrosion growth in the thickness of the corrosion
product in Å/month and the rate of weight gain assumes that Cu2S and Cu2O grow in equal proportions.
3 The derivation of the equivalence between the rate of silver corrosion growth in the thickness of the corrosion
product in Å/month and the rate of weight gain assumes that Ag2S is the only corrosion product.
4 The deliquescent relative humidity of particulate contamination is the relative humidity at which the dust absorbs
enough water to become wet and promote ionic conduction.
5 Surface debris is randomly collected from 10 areas of the data center on a 1.5 cm diameter disk of sticky
electrically conductive tape on a metal stub. If examination of the sticky tape in a scanning electron microscope
reveals no zinc whiskers, the data center is considered free of zinc whiskers.
Management options
The XClarity portfolio and other system management options described in this section are available to help
you manage the servers more conveniently and efficiently.
12 ThinkSystem SR635 V3 System Configuration Guide