no space left on device -- but there is space left on device

[TurtleSnail]

Error in the logs:

lvl=error msg="failed to write blob" err="open /mnt/fast2/BLOBS/0x765180c2144cc82e2fde91f5c197332264f3922f43fc04b10fa915a48411c096: no space left on device"

But device has plenty of space:

# df -h | grep fast2
/dev/nvme4n1p2  2.8T  178G  2.5T   7% /mnt/fast2

[TurtleSnail]

logs indicate:

dmesg | grep full
index full, reach max htree level :2

the blob directory got to about 5m entries.

i have turned on large_dir filesystem feature, and will try again.

unfortunatley because of this issue #39 i will need to delete all the 5m existing blobs and start again from '1'.