User's Manual
Table Of Contents
Table of Contents
Chapter 1: Before You Start
Package Contents 3
Synology RS4021xs+ at a Glance 4
System Modes and LED Indicators 6
Other LED Indicators 8
Hardware Speciîš¿cation 9
Spare Parts 10
Optional Accessories 10
Safety Instructions 11
Chapter 2: Hardware Setup
Tools and Parts for Drive Installation 12
Install Drives 12
Install Memory Modules 14
Install PCle Add-in Cards 17
Install and Remove Rail Kits 18
Expansion Unit Deployment and Topology 20
Start up Your Synology NAS 21
Chapter 3: System Maintenance
Replace System Fan 22
Replace Power Supply Unit (PSU) 23
Chapter 4: Install DSM on Synology NAS
Install DSM with Web Assistant 24
Learn More 24
Synology_HIG_RS4021xs+_20200723
2