Re: no space left, metadata usage almost full?

[Hugo Mills <hugo@carfax.org.uk>]

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On Wed, Dec 18, 2013 at 09:37:28PM +0900, Tomasz Chmielewski wrote:
> I have a btrfs filesystem which has plenty of free space left, yet it's
> hitting out of space regularly.
> 
> Here is how it looks like:
> 
> # btrfs fi df /home
> Data, RAID1: total=2.51TiB, used=1.58TiB
> System, RAID1: total=32.00MiB, used=372.00KiB
> Metadata, RAID1: total=48.00GiB, used=47.23GiB
> 
> 
> What I read from it, is we're almost full on metadata usage, and that
> might be causing out of space issues.

   This is highly likely.

> Reading past posts on this group, I can see it's recommended to run
> this if I hit out of space and the fs is low on metadata space:
> 
> # btrfs fi balance start -dusage=5 /home
> 
> Is it really the only workaround? Shouldn't the filesystem be more
> intelligent and be able to grab some more metadata space if it's
> running low?

   Currently, yes, it is the only approach.

   The automatic reclamation of unused chunks (or barely-used chunks)
is on the projects list. Nobody's got round to implementing it yet.

> I'd appreciate some clarifications on this (FYI, it was running
> 3.11.4, upgraded to the latest rc now).

   Hope the above helps,
   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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