December 23, 20241 yr A 5TB drive went "unmountable unsupported or no file system" while still being a greenball. I stopped the array, marked the slot as not installed. I started the array, then stopped the array. I installed an online, pre-cleared 12tb. I enabled the array, but didn't notice that the system was still complaining the 12tb was not formatted. Thinking that the new drive will be completely rebuilt anyhow, I wasn't worried. The array started, it rebuilt to the new drive without issue. The new drive showed only 87gb used on the new 12tb. Luckily, nothing was wrong with the 5TB, I was able to load it on another system and view what was on it. I verified that what was on that drive is no longer available on the network (not being emulated). Hence, UNRAID tried to loose me 5TB of data without any error! What went wrong!? I followed the drive replacement steps in the unraid manual.
December 23, 20241 yr Community Expert Without the diagnostics that cover the period it is not possible to say, but the symptoms suggest that at some point you did a format. You also do not mention whether you did a check filesystem on the unmountable drive (which is the procedure that should have been used.).
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