Re: 97% full system, dusage didn't help, musage strange

[Leszek Dubiel <leszek@dubiel.pl>]

>>
>> It failed now — there is 258 GB free, but balancing didn't help to
>> restore unallocated space.
>
> Because there isn't that much free space to reclaim in the first place.
>
> Your data and metadata chunks are already very highly utilized, you can
> increase the dusage/musage and retry, but they will only bring marginal
> gain if any.
>
> The only way to go next is start deleting more
> snapshots/subvolumes/files/etc.
>
> With more data/metadata space released, then try musage/dusage again
> which can free up some space.

This helped.
Thank you.



My system was deleting shapshots automatically if there was less then 
250 GB free space.
This procedure worked fine — 258 GB was free.

Second procedure was balancing system if there was less then 8GB of 
Unallocated space.
This procedure couldn't reclaim free space to makie it unallocated.




How to improve?

Tell the first procedure to keep 500GB free space? 800GB?

Or change the procedure to look at percentage of free disk space?
What is optimal? 90% should be maximum of occupied?

This is system for backups, so this could be almost full.