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Cache drive unmountable after a server crash

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Hello everyone

 

I'm currently in the process of transferring my Unraid to new hardware.

Unfortunately my system crashed, with the result that the cash drive is no longer recognized. The system was there too. to transfer the cash to a pool i.e. second M2 SSD. I have already tried the following.

 

1. Second SSD removed from the poll and restarted the array
2. Cashe completely removed from the pool Array started, stopped and added again.
3. tries to access via unassigned devices

 

Does anyone know how I can save the data?

 

Thanks for help

 

698976490_Screenshot2024-04-24110805.thumb.png.8fa82572bb5a3f24aedbcd81554e38a9.png

 

 

1470379877_Screenshot2024-04-24110651.thumb.png.c5eef33a8a59103da5af2287e00e83c4.png

 

1176915214_Screenshot2024-04-24110634.png.75b3f0661d43f1501214936e8f8daa08.png

 

tower-diagnostics-20240424-1045.zip

 

  • Community Expert

Post the output of

btrfs fi show

 

  • Author

warning, device 2 is missing
Label: none  uuid: be357807-42ce-4500-b64e-62a462ba2323
        Total devices 2 FS bytes used 429.98GiB
        devid    1 size 1.82TiB used 443.05GiB path /dev/nvme0n1p1
        *** Some devices missing

  • Author

ok, I put the second SSD back in the pool and it seems to work

 

Label: none  uuid: be357807-42ce-4500-b64e-62a462ba2323
        Total devices 2 FS bytes used 429.95GiB
        devid    1 size 1.82TiB used 444.05GiB path /dev/nvme0n1p1
        devid    2 size 1.82TiB used 104.03GiB path /dev/nvme1n1p1

 

image.thumb.png.2ebcf274db5880f06522054a51b64b1f.png

  • Author

one more question. The way I have it set up now, it should serve as a failsafe with the second SSD, right?

  • Community Expert

If it's configured as a redundant pool yes, you can post new diags to confirm.

  • Author

I just noticed that the first cache is working and the second one is not doing anything and is always 0B/s at read/writes

is that normal?

 

Edit: 

After an array restart, the second cache drive now also works

 

tower-diagnostics-20240424-1045.zip

Edited by swiss01

  • Community Expert

Those appear to be the same diags as before, would need current ones, with the pool mounted.

  • Community Expert

The pool is using the single profile, i.e., not redundant, and it will only mount if both devices are available, you can convert to raid1 to make it redundant.

  • Author

After trying to change the pool for a long time, it finally worked. I don't know why, but somehow unraid didn't want to take over the settings and I couldn't format the cache account either. After several attempts and restarts it finally worked.

 

many thanks for your support

 

tower-diagnostics-20240426-1257.zip

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