Netgear RN422X122 – ReadyNAS 4220 2U 12-Bay 12x2TB Enterprise Drives w/ 2x 10GbE Hardware Manual

The UI LED indicates these states:

On. The system is identified: The UI button was pressed.

Off. The system is not identified.

UI LED (rear panel)

Two LED status indicators are built into each LAN port. One LED is green and
one is amber. They indicate port speed and activity as follows:

Green on, amber off. 1000 Mbps connection speed, no activity.

Green blinking, amber off. 1000 Mbps connection speed, activity.

Green off, amber on. 10 Mbps or 100 Mbps connection speed, no activity.

Green off, amber blinking. 10 Mbps or 100 Mbps connection
speed, activity.

Green off, amber off. No connection.

LAN port LEDs (rear panel)

Use the boot menu to restart or troubleshoot your ReadyNAS storage system.Your storage system provides
the following boot modes:

Normal. Initiates a normal boot process, just like booting using the Power button.

Factory default. Initiates a short disk test that takes approximately 5 minutes. After the disk test, a
10-minute time-out period begins. During the 10-minute time-out period, you can choose to power off
the storage system without causing any data loss, and the factory default process is canceled. If you
choose not to power off the storage system, after the 10-minute time-out period, the factory default
process begins.

To start the factory default process immediately, press the Reset button during the
10-minute time-out period.

OS reinstall. Reinstalls the firmware from the internal flash to the disks. Use the OS reinstall boot mode
when the system crashes and corrupts some configuration files. OS reinstall boot mode also resets
some settings on your storage system, such as Internet protocol settings and the administrator password,
to defaults.

Tech support. Boots into a low-level diagnostic mode. Use the tech support boot mode only when a
NETGEAR technical support representative instructs you to do so.