Hi Chris,
It might be worth finding large files to defragment. See the ENOSPC errors
during raid1 rebalance thread. It sounds like it might be possible for some
fragmented files to be stuck across multiple chunks, preventing conversion.
I moved 400Gb from my other (but full) disc to the btrfs disc. This
freed up 400Gb on the full disc, so that I could move the other 400Gb to
the non-btrfs disc. Essentially, I think this also defragmented all
files, as they were freshly written (and as "single", so that in fact a
balance probably was not neccessarry anymore).
After this balance and device-delete worked, also the device-delete!
Nevertheless: I find it concerning, that this problem occured (remember,
it was a raid with no SMART errors) and could not be fixed. My
understanding was, that this should not happen to btrfs even in its
current state.
Thanks!
Greetings,
Hendrik
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