Front control panel

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The power status and the hard disk drive and network activity of the appliance can be read from its front control panel, as shown in the following figure.

Figure 1. Front panel buttons and LEDs for the appliance
Buttons and LEDs on the front of the appliance

Front panel buttons and LEDs

The front control panel provides the following buttons (preceded by the callout numbers from the previous figure).
1. USB Ports
4. Reset button
Reboots the system. A needle, pin, or other small device is needed to activate this button and reset the system.
6. Power button
Powers on or powers off the system. Turning off system power with this button removes the main power but keeps standby power that is supplied to the system. Therefore, you must unplug the system before servicing.
8. Unit Identification (UID) button
When depressed, illuminates the UID LED on the front panel as well as the system board UID LED, which is visible at the rear of the system. Use these LEDs to locate the server within a rack. Press again to turn off the LEDs.

The front panel also provides the following LEDs (preceded by the callout numbers from the previous figure):

2. HDD activity LEDs (48 LEDs total)
Indicate the following possible statuses:
Table 1. HDD activity LEDs
Status Green Red
Offline or idle Off Off
Active Flash Off
Fail Off On
Locate Off 4-Hz flash
Rebuild Flash 1-Hz flash
3. Fan failure LEDs
Shows red if the fan has an error or is missing (each indicator represents one system fan). If any fan experiences an error or is missing, all system fans are run at full speed as a way to compensate for the error or the missing fan. If a fan error occurs, replace the fan immediately to avoid the risk of a system high temperature condition.
Attention: There are eight fans, and four fan assemblies. Each fan assembly consists of a pair of fans, in a dual rotor configuration. The fan pairs are 1-5, 2-6, 3-7, and 4-8. So if fan 1 fails (the fan led marked “1” is lit), the fan assembly 1-5, which consists of a single dual motor fan, must be replaced. See "Replace the Fans" for details.
5. Power LED
Shows green when power is on, unlit when power is off.
7. Global failure indicator
Lights when a PSU fault or fan error or high temperature condition or any combination is encountered.
Top Loading Drive Carrier LEDs
A single LED on the top extractor handle of each drive indicates drive activity when flashing green.