Re: No space left on device (again)

[Josef Bacik <jbacik@fb.com>]

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On 02/25/2014 03:27 PM, Marcus Sundman wrote:
> On 25.02.2014 22:19, Hugo Mills wrote:
>> On Tue, Feb 25, 2014 at 01:05:51PM -0500, Jim Salter wrote:
>>> 370GB of 410GB used isn't really "fine", it's over 90% usage.
>>> 
>>> That said, I'd be interested to know why btrfs fi show
>>> /dev/sda3 shows 412.54G used, but btrfs fi df /home shows 379G
>>> used...
>> This is an FAQ...
>> 
>> btrfs fi show tells you how much is allocated out of the
>> available pool on each disk. btrfs fi df then shows how much of
>> that allocated space (in each category) is used.
> 
> What is the difference between the "used 371.11GB" and the "used 
> 412.54GB" displayed by "btrfs fi show"?
> 
>> The problem here is also in the FAQ: the metadata is close to
>> full -- typically something like 500-750 MiB of headroom is
>> needed in metadata. The FS can't allocate more metadata because
>> it's allocated everything already (total=used in btrfs fi show),
>> so the solution is to do a filtered balance:
>> 
>> btrfs balance start -dusage=5 /mountpoint
> 
> Of course that was the first thing I tried, and it didn't help *at*
> *all*:
> 

The -dusage=<number> is a means to an end, so if that doesn't work try
a larger number, up to 100.  Really once you pass 50 and it's not
working then it's time to just do a balance.  The next thing is to use
compression (too late for this option really) or add another disk.
Thanks,

Josef

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