Re: ceph-fs tests

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On Wed, Sep 5, 2012 at 9:22 AM, Tommi Virtanen <tv@xxxxxxxxxxx> wrote:
> On Tue, Sep 4, 2012 at 4:26 PM, Smart Weblications GmbH - Florian
> Wiessner <f.wiessner@xxxxxxxxxxxxxxxxxxxxx> wrote:
>> i set up a 3 node ceph cluster 0.48.1argonaut to test ceph-fs.
>>
>> i mount ceph via fuse, then i downloaded kernel tree and decompressed a few
>> times, then stopping one osd (osd.1), afer a while of recovering, suddenly:
>>
>> tar: linux-3.5.3/drivers/media/video/zoran/zr36060.h: Kann write nicht
>> ausführen: Auf dem Gerät ist kein Speicherplatz mehr verfügbar
>> linux-3.5.3/drivers/media/video/zr364xx.c
>> tar: linux-3.5.3/drivers/media/video/zr364xx.c: Kann write nicht ausführen: Auf
>> dem Gerät ist kein Speicherplatz mehr verfügbar
>> linux-3.5.3/drivers/memory/
>
> Please provide English error messages when you share things with the
> list. In this case I can figure out what the message is, but really,
> we're all pattern matching animals and the specific strings in
> /usr/include/asm-generic/errno.h are what we know.
>
>> no space left on device, but:
>>
>> 2012-09-04 18:46:38.242840 mon.0 [INF] pgmap v2883: 576 pgs: 512 active+clean,
>> 64 active+recovering; 1250 MB data, 14391 MB used, 844 MB / 15236 MB avail;
>> 36677/215076 degraded (17.053%)
>>
>> there is space left?
>
> Only 844 MB available, with the pseudo-random placement policies,
> means you practically are out of space.
>
> It looks like you had only 15GB to begin with, and with typical
> replication, that's <5GB usable space. That is dangerously small for
> any real use; Ceph currently does not cope very well with running out
> of space.

In this particular case, one of the OSDs is more than 95% full and has
been marked as full (which stops cluster IO) to prevent those
catastrophic failures from occurring. If you look at the full output
of ceph -s, you should see a warning about having OSDs full and
near-full.
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