On Tue, 09 Sep 2014 23:49:10 +0200, Arnd Bergmann wrote:
> Label: none uuid: 1d88cccb-3d0e-42d9-8252-a226dc5c2e47
> Total devices 1 FS bytes used 8.79GB
> devid 1 size 67.14GB used 67.14GB path /dev/sdc6
^^^^^^^^^^^^^^^^^^^^ *ding ding ding*
The term "used" is confusing here and really should be called
"allocated", since it's more than the number of actually used
bytes. Note that df shows that you "have" ~66GB data and ~1GB
metadata (giving approx. ~67GB), despite the fact that of those
65GB data allocated only ~8GB are actually used.
However all these reserved data chunks are preventing the metadata
space from expanding, which is pretty full:
Metadata, DUP: total=1.00GB, used=799.54MB
Here "total" also should be "allocated/reserved" and is 1GB, but
btrfs feels it's necessary to allocate a new metadata chunk
(which would also increase "total") and fails.
Running balance with -dusage=x will garbage-collect the reserved but
mostly-empty data chunks with "up to x" percent actual usage.
-h
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