Re: ENOSPC while df shows 826.93GiB free

Christoph Anton Mitterer [off-list ref] writes:

yet:
# /srv/dcache/pools/2/foo
-bash: /srv/dcache/pools/2/foo: No such file or directory

I'm not sure what you intended this to do or show.  It looks like you
tried to execute a program named /srv/dcache/pools/2/foo, and there is
no such program.  That doesn't say anything about the filesystem.

balancing also fails, e.g.:
# btrfs balance start -dusage=50 /srv/dcache/pools/2
ERROR: error during balancing '/srv/dcache/pools/2': No space left on device

Balance is basically like a defrag.  You have less than 0.01% space
free, which is not enough to do a defrag.  Either free up some space, or
don't bother trying to defrag.