On Tuesday 09 September 2014 22:57:25 Hugo Mills wrote:
> On Tue, Sep 09, 2014 at 11:49:10PM +0200, Arnd Bergmann wrote:
> > Ok, now I'm in the bad state again (after running a 'make allmodconfig'
> > kernel build:
> >
> > Label: none uuid: 1d88cccb-3d0e-42d9-8252-a226dc5c2e47
> > Total devices 1 FS bytes used 8.79GB
> > devid 1 size 67.14GB used 67.14GB path /dev/sdc6
>
> All the space on the FS has been allocated to some purpose or other.
>
> > Data: total=65.11GB, used=7.99GB
>
> Here, you have 65 GiB allocated to data, but only 8 GiB of that
> used. The FS won't automatically free up any of that (yet -- it's one
> of the project ideas).
Ok, I see.
> So... you need to free up some data chunks. You can do this with:
>
> # btrfs balance start -dusage=5 /mountpoint
>
> Take a look at the output of btrfs fi df and btrfs fi show
> afterwards, and see how much the Data allocation has reduced by, and
> how much unallocated space you have left afterwards. You may want to
> increase the number in the above balance command to some higher value,
> to free up even more chunks (it limits the balance to chunks less than
> n% full -- so the command above will only touch chunks with 5% actual
> data or less). This is in the FAQ.
This is the output afterwards:
$ time sudo btrfs fi balance start -dusage=5 /git/
Done, had to relocate 44 out of 70 chunks
real 0m22.026s
user 0m0.014s
sys 0m8.302s
$ sudo btrfs fi show /dev/sdc6
Label: none uuid: 1d88cccb-3d0e-42d9-8252-a226dc5c2e47
Total devices 1 FS bytes used 8.79GB
devid 1 size 67.14GB used 23.14GB path /dev/sdc6
$ sudo btrfs fi df /git
Data: total=21.01GB, used=7.99GB
System, DUP: total=8.00MB, used=12.00KB
System: total=4.00MB, used=0.00
Metadata, DUP: total=1.05GB, used=821.32MB
Metadata: total=8.00MB, used=0.00
: total=200.00MB, used=0.00
I'm pretty sure I read the FAQ one of the last times this happened,
but I thought it would only apply to mostly full file systems.
I can usually recover by moving all the data to tmpfs and doing
a new mkfs before moving the data back, and that normally lasts
for a few months before I run out of space again.
I'll try to see how long it takes until the problem comes back
now.
Arnd
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
