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 Lenovo Service 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. 
•  Active 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.
2
ThinkSystem SR635 V3 System Configuration Guide