Try btrfs filesystem balance start -dusage=15 /home, and gradually increase it until you see it relocate at least one chunk.
On Tue, Feb 25, 2014 at 2:27 PM, Marcus Sundman <sund...@iki.fi> 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*: > >> # btrfs filesystem balance start -dusage=5 /home >> Done, had to relocate 0 out of 415 chunks >> # > > > ... and it really didn't free anything. > > >>> On 02/25/2014 11:49 AM, Marcus Sundman wrote: >>>> >>>> Hi >>>> >>>> I get "No space left on device" and it is unclear why: >>>> >>>>> # df -h|grep sda3 >>>>> /dev/sda3 413G 368G 45G 90% /home >>>>> # btrfs filesystem show /dev/sda3 >>>>> Label: 'home' uuid: 46279061-51f4-40c2-afd0-61d6faab7f60 >>>>> Total devices 1 FS bytes used 371.11GB >>>>> devid 1 size 412.54GB used 412.54GB path /dev/sda3 >>>>> >>>>> Btrfs v0.20-rc1 >>>>> # btrfs filesystem df /home >>>>> Data: total=410.52GB, used=369.61GB >>>>> System: total=4.00MB, used=64.00KB >>>>> Metadata: total=2.01GB, used=1.50GB >>>>> # >>>> >>>> So, 'data' and 'metadata' seem to be fine(?), but 'system' is a >>>> bit low. Is that it? If so, can I do something about it? Or should >>>> I look somewhere else? >>>> >>>> I really wish I could get a warning before running out of disk >>>> space, instead of everything breaking suddenly when there seems to >>>> be lots and lots of space left. >>>> >>>> - Marcus >>>> > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
