On Thu, Dec 1, 2016 at 7:10 AM, Stefan Priebe - Profihost AG <s.pri...@profihost.ag> wrote: > > Am 01.12.2016 um 14:51 schrieb Hans van Kranenburg: >> On 12/01/2016 09:12 AM, Andrei Borzenkov wrote: >>> On Thu, Dec 1, 2016 at 10:49 AM, Stefan Priebe - Profihost AG >>> <s.pri...@profihost.ag> wrote: >>> ... >>>> >>>> Custom 4.4 kernel with patches up to 4.10. But i already tried 4.9-rc7 >>>> which does the same. >>>> >>>> >>>>>> # btrfs filesystem show /ssddisk/ >>>>>> Label: none uuid: a69d2e90-c2ca-4589-9876-234446868adc >>>>>> Total devices 1 FS bytes used 305.67GiB >>>>>> devid 1 size 500.00GiB used 500.00GiB path /dev/vdb1 >>>>>> >>>>>> # btrfs filesystem usage /ssddisk/ >>>>>> Overall: >>>>>> Device size: 500.00GiB >>>>>> Device allocated: 500.00GiB >>>>>> Device unallocated: 1.05MiB >>>>> >>>>> Drive is actually fully allocated so if Btrfs needs to create a new >>>>> chunk right now, it can't. However, >>>> >>>> Yes but there's lot of free space: >>>> Free (estimated): 193.46GiB (min: 193.46GiB) >>>> >>>> How does this match? >>>> >>>> >>>>> All three chunk types have quite a bit of unused space in them, so >>>>> it's unclear why there's a no space left error. >>>>> >>> >>> I remember discussion that balance always tries to pre-allocate one >>> chunk in advance, and I believe there was patch to correct it but I am >>> not sure whether it was merged. >> >> http://www.spinics.net/lists/linux-btrfs/msg56772.html > > Thanks - still don't understand why that one is not upstream or why it > was reverted. Looks absolutely reasonable to me.
It is upstream and hasn't been reverted. https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/fs/btrfs/volumes.c?id=refs/tags/v4.8.11 line 3650 I would try Duncan's idea of using just one filter and seeing what happens: 'btrfs balance start -dusage=1 <mp>' >>>> With enospc debug it says: >>>> [39193.425682] BTRFS warning (device vdb1): no space to allocate a new >>>> chunk for block group 839941881856 >>>> [39193.426033] BTRFS info (device vdb1): 1 enospc errors during balance It might be nice if this stated what kind of chunk it's trying to allocate. -- Chris Murphy -- 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
