Re: ceph -w output

["Jens Rehpöhler" <jens.rehpoehler@filoo.de>]

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Hi Sam,

just to inform you: after upgrade to the lastest master (ceph version
0.39-210-gdf84594 (commit:df84594f205bb37d3b062b5b3b9cfd224e6c57d2)

the pgs in "creating" state disappeared. The bugfix seems to work.

Thx again

Jens

Am 16.12.2011 12:14, schrieb Jens Rehpöhler:
> Hi Sam,
>
> thanks for the answers.
>
> We began with osd3 und osd4 for internal reasons. osd1 to 3 will be
> addes in near future.
>
> I will wait until the patch is in the stables branch.
>
> Thanks again
>
> Jens
>
>
> Am 15.12.2011 18:35, schrieb Samuel Just:
>> Sorry for the delay.  It looks like you hit a corner case in our crush
>> implementation.  The short version is that this bug got fixed last
>> week in commit 14f8f00e579083db542568a60cd23d50055c92a3.
>>
>> The long version is that you have osd.3 and osd.4, but not osd.0,
>> osd.1, or osd.2.  The pgs stuck in creating are the ones mapped
>> specifically to osds 0, 1, and 2.  A pg ending in p# (like pg1.0p0) is
>> supposed to map to osd.0 if possible.  With the above patch, those pgs
>> should remap to available osds.
>>
>> -Sam
>>
>> On Thu, Dec 15, 2011 at 1:45 AM, Jens Rehpöhler
>> <jens.rehpoehler@filoo.de> wrote:
>>> Am 14.12.2011 17:43, schrieb Tommi Virtanen:
>>>> On Wed, Dec 14, 2011 at 00:36, Jens Rehpöhler <jens.rehpoehler@filoo.de> wrote:
>>>>> Attached you will find the output you asked for. Is there any limitation
>>>>> on the amount of pools ? We create
>>>>> pools for every customer and store their VM images in that pools. So we
>>>>> will create a lot of pools over time.
>>>> Each pool gets its own set of PGs (Placement Groups). An OSD that
>>>> manages too many PGs will use a lot of RAM. What is "too many" is
>>>> debatable, and really up to benchmarks, but considering we recommend
>>>> about 100 PGs/OSD as a starting point, you probably don't want to go
>>>> two orders of magnitude above that.
>>> Ok .... that will serve our needs. Remains only the "creating" question.
>>>
>>> Any answers to that ?
>>>
>>> Thanks a lot !
>>>
>>> Jens
>>>


-- 
mit freundlichen Grüssen

Jens Rehpöhler

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