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What could cause Unraid reboot to be very slow or hang?

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From the Main page, I needed to reboot Unraid to change VFIO passthrough for a VM.

I selected Reboot after stopping VMs and Dockers. It started the process and the Array seemed to stop in a minute or so.

Now I have this screen that has gone on for 10 minutes. The T440 fan has increased to maximum speed.

Reboot - T440

Array Stopped
System is rebooting 612

Is something going on? I supposed I'll have to use IDRAC to power cycle it, but I'd prefer to have reboot from Unraid work as expected.


  • Community Expert

Look at the display output to see what the system is stuck on.

Also you often have to manually reload the page but if your fans are spinning fast it's likely unrelated and the system is stuck on POST before even starting to boot the OS.

Edited by Kilrah

  • Author

Here's a detailed log of what happens when I reboot Unraid from the GUI. Note I stop all Docker, VMs, and the array before initializing the reboot.

Reboot Timeline

2025-10-26 12:27:18 Confirm Reboot from Unraid GUI (array already stopped)

2025-10-26 12:27:46  Monitor shows Unraid shutdown and then blanks

2025-10-26 12:30:39  T440 Fans speed up to max  - monitor still blank

2025-10-26 12:40:48 10 minutes with no change

2025-10-26 12:41:05  Using Dell T440 IDRAC reset system (warm boot)

2025-10-26 12:41:20  Dell BIOS POST screen appears on monitor

2025-10-26 12:41:48  BIOS screen blanks

2025-10-26 12:42:56  Unraid Boot terminal output on screen

2025-10-26 12:43:45  Unraid boot complete - login prompt on terminal screen

2025-10-26 12:44:15  Log in from web GUI

2025-10-26 12:44:34  T440 fans slow down to normal

My question is - should I even use the Unraid GUI to boot, or just start from IDRAC?

  • Community Expert

That looks more like an issue with the server, you can rule out a config problem by booting a different Unraid flash drive using a stock install, no key needed, then see if the behavior is the same.

  • Author

So you're saying get another flash drive, install Unraid on it, and boot, and then try the Reboot from the GUI.

If it hangs for 10+ minutes, then it's something about the server?

If I can know Unraid is shutting down OK first, it's not a big deal to do the warm boot from in IDRAC.

I don't have to do it that often.

Next time I need to reboot, I'll video the Unraid console monitor as it rapidly scrolls text then immediately blacks out. Maybe I can see the "last message" of Unraid is that it has completed shutdown.

Edited by timg11

  • Community Expert
9 minutes ago, timg11 said:

If it hangs for 10+ minutes, then it's something about the server?

Yep, possibly some compatibility issue.

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