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====== LED Behavior ======

The front and rear LEDs indicate drive status and activity (only the 2big and 5big have rear drive LEDs). This section describes the behavior of the LED indicators.

<note tech>**Technical note:** Even if you have turned off the front LED using the Dashboard, events triggering a red light will always cause the front LED to turn on.</note>

++++ d2 |

^ Front LED Color ^ State ^
| Blinking blue \\ {{:static:led:led-dashed2-blue.png?nolink|}} | Occurs as the device is booting; will cease once the drives are fully initialized |
| ::: | Backup in progress |
| Solid blue \\ {{:static:led:led-solid-blue.png?nolink|}} | Drive working (read/write) |
| Blinking red \\ {{:static:led:led-dashed2-red.png?nolink|}} | Temperature alert (first level) |
| ::: | Power supply has been cut but power is still being supplied through the UPS |
| Solid red \\ {{:static:led:led-solid-red.png?nolink|}} | Temperature alert (critic level) – the product will shut off |
| ::: | Power supply has been cut and the UPS has run out of reserve power – the product will shut off |

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++++ 2big/5big |

^ Front LED Color ^ Rear LED Color ^ State ^
| Blinking blue \\ {{:static:led:led-dashed2-blue.png?nolink|}} | Activity LED for working disk(s) (until they are fully initialized) \\ {{:static:led:led-dashed1-blue.png?nolink|}} | Occurs as the device is booting; will cease once the drives are fully initialized |
| ::: | Activity LED for working disk(s) \\ {{:static:led:led-dashed1-blue.png?nolink|}} | Backup in progress |
| ::: | Blinking blue/red \\ {{:static:led:led-dashed2-bluered.png?nolink|}} | RAID synchronizing; will cease once operation has concluded |
| Solid blue \\ {{:static:led:led-solid-blue.png?nolink|}} | Activity LED for working disk(s) \\ {{:static:led:led-dashed1-blue.png?nolink|}} | Drive working (read/write) |
| Blinking red \\ {{:static:led:led-dashed2-red.png?nolink|}} | Activity LED for working disk(s) \\ {{:static:led:led-dashed1-blue.png?nolink|}} | RAID is degraded; data is intact but no longer protected from further failed disks |
| ::: | Solid red for non-functional disk(s) \\ {{:static:led:led-solid-red.png?nolink|}} | ::: |
| ::: | Activity LED \\ {{:static:led:led-dashed1-blue.png?nolink|}} | Temperature alert (first level) |
| ::: | ::: | Fan is not spinning |
| ::: | ::: | Power supply has been cut but power is still being supplied through the UPS |
| Solid red \\ {{:static:led:led-solid-red.png?nolink|}} | Activity LED for working disk(s) \\ {{:static:led:led-dashed1-blue.png?nolink|}} | Temperature alert (critic level) – the product will shut off |
| ::: | Activity LED for working disk(s) \\ {{:static:led:led-dashed1-blue.png?nolink|}} | Power supply has been cut and the UPS has run out of reserve power – the product will shut off |
| ::: | Solid red for non-functional disk(s) \\ {{:static:led:led-solid-red.png?nolink|}} | RAID has failed and data has been lost |
| ::: | Off in disconnected disk(s) | Disk(s) is/are disconnected |

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