Unountable disk in cache pool after upgrade to v6.6.6


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Last month I upgraded the Unraid OS from 6.2.4 to 6.6.5, then to 6.6.6 about a week later.  All seemed fine until I noticed some of my docker appdata was missing.  I didn't notice a problem with the cache pool until now mostly because all disk statuses were green.  I have an unmountable cache disk.

 

I've managed to mount the fs and copy the data I need.  Considering that, is there any harm in attempting a repair with this command?  Or am I better off to simply reformat?  I've never used it before and all refs say use as last resort.

btrfs check --repair <device>

  

The file system checker in the GUI reported no errors.  I'm kind of confused.  Anyone know of possible reasons why the disk got to this state?

 

 

 

cachepool.jpg

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I tried the repair for kicks and although it reported the cache disk returned to normal operation; it wasn't.

19 hours ago, johnnie.black said:

best bet is to reformat and restore

I had a heck of a time trying to do this.  This is more or less the steps I took.   Is there an easier way? 

  1. Stop array
  2. Unassign both
  3. Start array
  4. Stop array
  5. Assign #1 cache
  6. Start array
  7. Format #1 cache
  8. Stop array
  9. Assign #2 cache
  10. Start array (data on #2 is wiped upon array start)
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