From: Josef Bacik <jbacik@fb.com>
To: Marcus Sundman <sundman@iki.fi>, <linux-btrfs@vger.kernel.org>
Cc: Hugo Mills <hugo@carfax.org.uk>, Jim Salter <jim@jrs-s.net>
Subject: Re: No space left on device (again)
Date: Tue, 25 Feb 2014 15:30:30 -0500 [thread overview]
Message-ID: <530CFD66.7060006@fb.com> (raw)
In-Reply-To: <530CFCCE.5060707@iki.fi>
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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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next prev parent reply other threads:[~2014-02-25 20:30 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-25 16:49 No space left on device (again) Marcus Sundman
2014-02-25 18:05 ` Jim Salter
2014-02-25 19:59 ` Marcus Sundman
2014-02-25 20:19 ` Hugo Mills
2014-02-25 20:27 ` Marcus Sundman
2014-02-25 20:30 ` Josef Bacik [this message]
2014-02-26 10:38 ` Sander
2014-02-27 0:16 ` Marcus Sundman
2014-02-27 1:17 ` Josef Bacik
2014-02-27 7:48 ` Hugo Mills
2014-02-25 20:30 ` cwillu
2014-02-25 20:40 ` Hugo Mills
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