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[7.*.*] Unraid not booting. "Waiting up to 30 sec for device with label UNRAID to come online" Unmount /dev target is busy

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I've been having an issue recently on both 7.1.4 and 7.2.0 where my server would restart and then fail to boot.

image.png

FYI, I'm running unraid on bare metal, a Supermico Motherboard and an HBA SAS Backplane.
I've been running Unraid for 10 years on the same hardware and have had my share of issues, but never this one.

I have not changed the hardware at all. This started happening after I had been on 7.1.4 for a long time.

I even migrated Unraid to a new USB thinking there was an issue with the old one not being recognized.

I honestly don't see a lot of info about this error. I found one post in the virtualization forum but I don't think that's the same issue.

I have 8 HDDs for my array and 2 SSDs for my cache.

Any help pointing me in the right direction would be appreciated.

  • Community Expert

Try booting with a new flash drive with a stock install, no key needed, to see if the issue is config related.

  • Author
On 11/17/2025 at 11:59 PM, JorgeB said:

Try booting with a new flash drive with a stock install, no key needed, to see if the issue is config related.

Sorry for the late reply. I'm able to boot into Unraid on a fresh install. I was also able to boot into Unraid the first time after a fresh install + copying over my config folder. I was only unable to boot into Unraid after my server restarted a couple times.

What would this tell me? What kind of config would cause an issue like this?

  • Community Expert
6 hours ago, brianbrifri said:

I was only unable to boot into Unraid after my server restarted a couple times.

That seems odd, and it works again if you restore a stock config?

  • Author
16 minutes ago, JorgeB said:

That seems odd, and it works again if you restore a stock config?

Yup. I'm doing it again to double check.

  • Community Expert

If that works, I would try restoring a few config files/folders at a time to try and find the culprit.

  • Author
13 hours ago, JorgeB said:

If that works, I would try restoring a few config files/folders at a time to try and find the culprit.

Yup, doing that now.

  • Author

@JorgeB I know this is technically unrelated to the posted issue, but one of the reasons I've been needing to boot is due to random server reboots. I'm able to get the system event log and this showed up:
Would bad memory cause a reboot? Unraid has been rebooting within a minute or so of fully booting up from a clean install. However, the server does not reboot while in bios. Currently running memtest86 but no errors so far through 32%.

Screenshot 2025-11-22 162147.png

  • Community Expert
8 hours ago, brianbrifri said:

Would bad memory cause a reboot?

Yes, that looks like a bad dimm (CPU2 DIMMG1), and an uncorrectable error will make the server crash/reboot

image.png

  • Author
13 minutes ago, JorgeB said:

Yes, that looks like a bad dimm (CPU2 DIMMG1), and an uncorrectable error will make the server crash/reboot

image.png

So, I ran memtest86 and got 1 good pass from it. Too impatient to run more.
I was able to boot into unraid with fresh-ish configs (all but plugins).

Server is now rebooting quite often, 5 minutes or less.

I pulled G1 and H1 RAM sticks just now since they are part of the same channel to see if that helps.
Any chance this could be PSU related? I'm not getting any IPMI errors about it.

  • Community Expert

That should be a bad DIMM

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