User's Manual

4
Chapter 1: Before You Start
Synology RS4021xs+ at a Glance
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1
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15 16 1714
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No. Article Name Location Description
1
POWER Button and
Indicator
Front
1. Press to power on your Synology NAS.
2. To power o󰀨 your Synology NAS, press and hold until you
hear a beep sound and the Power LED starts blinking.
2
STATUS Indicator
Displays the status of the system. For more information, see
"System Modes and LED Indicators".
3
ALERT Indicator
Displays warnings regarding fan or temperature. For more
information, see "Other LED Indicators".
4
Beep O󰀨 Button
Press to deactivate the beep that sounds when a malfunction
occurs.
5
DRIVE Status
Indicator
Displays the status of drives. For more information, see "Other
LED Indicators".
6
Drive Tray Install drives (hard disk drives or solid state drives) here.
7
Rail Kit Release Tab
Push in and hold to release your Synology NAS from the rail kit
lock.
1
1
For more information about the rail kit installation, please refer to the Quick Installation Guide that comes with the rail kit.