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Issue with Unraid Server: Unmountable Cache ZFS Pool and System Freeze

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Today, I encountered an issue where my Unraid server became unresponsive. I couldn't access the web interface or any of the services I had set up. As a result, I restarted the server via command line by entering echo "b" > /proc/sysrq-trigger. However, after rebooting, my cache ZFS pool remained stuck on 'Mounting disks...' and wouldn't complete the boot process. I had no choice but to boot into safe mode and attempt to recreate the Cache pool, but this didn't resolve the issue. Each time I start the array, I receive an 'Unmountable: Unsupported or no file system' error, and I'm prompted to format the disk. Despite following these instructions, I am still unable to create a functional setup and continue to receive the 'Unmountable: Unsupported or no file system' error.

unraid-diagnostics-20240123-1147.zip

  • Author

CleanShot 2024-01-23 at 11.58.12.gif

  • Author

I discovered that the issue could be resolved by creating a new cache pool with a different name than the previous one. The original cache pool was named 'cache'. I created a new one called 'new_cache', and this seemed to solve the problem.

  • Author

This problem came up again today.

  • Community Expert

If the pool is unmountable post new diags.

  • Author

Delete the pool and start over. So far, there haven't been any problems. I've implemented a script that runs "zpool scrub cache" every hour in hopes of achieving better results.

  • Community Expert
23 minutes ago, 许珂诚 said:

I've implemented a script that runs "zpool scrub cache" every hour

That's overkill IMHO.

  • Author
On 1/31/2024 at 5:25 PM, JorgeB said:

That's overkill IMHO.

But I can see errors after almost every run 0.0

  • Community Expert

Do you meant that there are errors after every scrub? Or that it's always 0?

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