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Cache Pool Drives Unmountable: wrong or no filesystem

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I was working on a installing a new flash drive and installing a PIKVM and after getting both of those set up, I now can't get my cache drives to work as they are unmountable.


Screenshot 2026-01-17 at 6.43.37 PM.png

theoasis-diagnostics-20260117-1844.zip

Solved by JorgeB

  • Community Expert
14 minutes ago, Easton Baker said:

installing a new flash drive

Did you get your configuration on the new flash?

  • Author
1 minute ago, trurl said:

Did you get your configuration on the new flash?

I used the back up downloaded from the GUI and had to manual add it to the new USB. But I believe I got everything set up correctly. I actually had the same issue on the old USB before I figured out how to transfer the key to the new USB.

  • Community Expert
  • Solution

btrfs was detecting data corruption on both devices, and you have a Ryzen with overclocked RAM, which is known to cause data corruption, so I recommend correcting that first:

https://forums.unraid.net/topic/46802-faq-for-unraid-v6/page/2/#findComment-819173

After that, it's still a good idea to run memtest, in case the RAM is actually bad, and then there are some recovery options you can try for the pool here:

https://forums.unraid.net/topic/46802-faq-for-unraid-v6/page/2/#findComment-543490

  • Author
13 hours ago, JorgeB said:

btrfs was detecting data corruption on both devices, and you have a Ryzen with overclocked RAM, which is known to cause data corruption, so I recommend correcting that first:

https://forums.unraid.net/topic/46802-faq-for-unraid-v6/page/2/#findComment-819173

After that, it's still a good idea to run memtest, in case the RAM is actually bad, and then there are some recovery options you can try for the pool here:

https://forums.unraid.net/topic/46802-faq-for-unraid-v6/page/2/#findComment-543490

I did have a ram stick fail memtest but I haven't had any success with the other options to recover the pool

Edit: did eventually get it to work. Thank you!

Edited by Easton Baker

  • Community Expert

You must never attempt to run any computer unless memory is working perfectly. Everything goes through RAM. The OS and other executable code, your DATA. EVERYTHING. The CPU can't do anything with anything until it is loaded into RAM.

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