# ServeRAID Manager and LED flash states

The amber and blue LEDs are controlled by the backplane (for internal physical drives) or enclosure (for external physical drives). Controllers send commands to the backplane or enclosure processor to set a logical state for the LED, and the subsystem translates that LED state into the following flash states:

Controller device state | Slot state | LED flash state
defunct | Device is faulty | On
Rebuilding | Device is rebuilding | Slow flash
Identify | Identify the device | Fast flash
Other | No error | Off

The green LED is an activity indicator for the physical drive and is controlled by the physical drive.

## More information

- Identifying devices (action)
- Using Identify to work with your systems

Glossary | Contents

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