On 2017-10-19 12:14, Martin Raiber wrote:
You could also mount with
"enospc_debug" to give the devs more infos about this issue.
I am having more ENOSPC issues with 4.9.x than with the latest 4.14.

Here is the dmesg output with -o enospc_debug, hopefully it will be useful for someone:
https://dump.thecybershadow.net/266ad878bed7921ccca3a7f624df0cc7/scratch.txt

for me a work-around for something like this has been to reduce the
amount of dirty memory

In the end I deleted some snapshots, that seemed to free up enough metadata for the balance to continue. After 25 hours, a balance with -dusage=10 finished and freed up 344GB of "Device unallocated" space.

--
Best regards,
 Vladimir
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