Re: upstream/firefly exporting the same snap 2 times results in different exports

[Stefan Priebe - Profihost AG <s.priebe@profihost.ag>]

Am 21.07.2015 um 22:50 schrieb Josh Durgin:
> Yes, I'm afraid it sounds like it is. You can double check whether the
> watch exists on an image by getting the id of the image from 'rbd info
> $pool/$image | grep block_name_prefix':
> 
>     block_name_prefix: rbd_data.105674b0dc51
> 
> The id is the hex number there. Append that to 'rbd_header.' and you
> have the header object name. Check whether it has watchers with:
> 
>     rados listwatchers -p $pool rbd_header.105674b0dc51
> 
> If that doesn't show any watchers while the image is in use by a vm,
> it's #9806.

Yes it does not show any watchers.

> I just merged the backport for firefly, so it'll be in 0.80.11.
> Sorry it took so long to get to firefly :(. We'll need to be
> more vigilant about checking non-trivial backports when we're
> going through all the bugs periodically.

That would be really important. I've seen that this one was already in
upstream/firefly-backports. What's the purpose of that branch?

Greets,
Stefan

> Josh
> 
> On 07/21/2015 12:52 PM, Stefan Priebe wrote:
>> So this is really this old bug?
>>
>> http://tracker.ceph.com/issues/9806
>>
>> Stefan
>> Am 21.07.2015 um 21:46 schrieb Josh Durgin:
>>> On 07/21/2015 12:22 PM, Stefan Priebe wrote:
>>>>
>>>> Am 21.07.2015 um 19:19 schrieb Jason Dillaman:
>>>>> Does this still occur if you export the images to the console (i.e.
>>>>> "rbd export cephstor/disk-116@snap - > dump_file")?
>>>>>
>>>>> Would it be possible for you to provide logs from the two "rbd export"
>>>>> runs on your smallest VM image?  If so, please add the following to
>>>>> the "[client]" section of your ceph.conf:
>>>>>
>>>>>    log file = /valid/path/to/logs/$name.$pid.log
>>>>>    debug rbd = 20
>>>>>
>>>>> I opened a ticket [1] where you can attach the logs (if they aren't
>>>>> too large).
>>>>>
>>>>> [1] http://tracker.ceph.com/issues/12422
>>>>
>>>> Will post some more details to the tracker in a few hours. It seems it
>>>> is related to using discard inside guest but not on the FS the osd is
>>>> on.
>>>
>>> That sounds very odd. Could you verify via 'rados listwatchers' on an
>>> in-use rbd image's header object that there's still a watch established?
>>>
>>> Have you increased pgs in all those clusters recently?
>>>
>>> Josh
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