QNAP

QuTS hero 5.0.x

NAS Behavior During a Power Outage

The following table describes the possible scenarios during a power outage and the corresponding NAS behavior.

Phase

Scenario

NAS Behavior

Phase 1: From the start of the power outage until the end of the specified waiting time

The power outage occurs.

The NAS detects the remaining UPS power.

The UPS power is greater than 15%.

Depending on your UPS settings, the NAS powers off or switches to auto-protection mode after the specified waiting time elapses.

The UPS power is less than 15%.

After 30 seconds, the NAS automatically powers off or switches to auto-protection mode regardless of the specified waiting time.

The power is restored.

The NAS remains functional.

Phase 2: From the end of the specified waiting time until the UPS runs out of power

The power is not restored, and the NAS is in auto-protection mode.

The NAS stops all running services. All shared folders and iSCSI LUNs become inaccessible.

The power is not restored, and the NAS is powered off.

The NAS remains powered off.

The power is restored, and the NAS is in auto-protection mode.

The NAS restarts and resumes its previous state.

The power is restored, and the NAS is powered off.

The NAS remains powered off.

Phase 3: From the moment the UPS runs out power until the power is restored

The power is not restored, and the NAS is in auto-protection mode.

The NAS powers off.

The power is not restored, and the NAS is powered off.

The NAS remains powered off.

The power is restored.

The NAS applies the specified power recovery settings.