On Fri, 08 Apr 2016 20:36:26 +0900
Tomasz Chmielewski <tch@virtall.com> wrote:

> On 2016-02-08 20:24, Roman Mamedov wrote:
> 
> >> Linux 4.4.0 - btrfs is mainly used to host lots of test containers,
> >> often snapshots, and at times, there is heavy IO in many of them for
> >> extended periods of time. btrfs is on HDDs.
> >> 
> >> 
> >> Every few days I'm getting "no space left" in a container running 
> >> mongo
> >> 3.2.1 database. Interestingly, haven't seen this issue in containers
> >> with MySQL. All databases have chattr +C set on their directories.
> > 
> > Hello,
> > 
> > Do you snapshot the parent subvolume which holds the databases? Can you
> > correlate that perhaps ENOSPC occurs at the time of snapshotting? If 
> > yes, then
> > you should try the patch https://patchwork.kernel.org/patch/7967161/
> > 
> > (Too bad this was not included into 4.4.1.)
> 
> By the way - was it included in any later kernel? I'm running 4.4.5 on 
> that server, but still hitting the same issue.

It's not in 4.4.6 either. I don't know why it doesn't get included, or what
we need to do. Last time I asked, it was queued:
http://www.spinics.net/lists/linux-btrfs/msg52478.html
But maybe that meant 4.5 or 4.6 only? While the bug is affecting people on
4.4.x today.

Thanks

-- 
With respect,
Roman