[linux-lvm] how to recover after thin pool metadata did fill up?
Andres Toomsalu
andres at active.ee
Thu Oct 18 13:35:26 UTC 2012
It has been commented that about 500MB should be enough by far - but as we could fill 128MB metadata easily with 1TB pool size just rewriting some 600GB during thin snapshot existance - I would go and reserve much more for metadata - so that it wont become an issue for sure. Probably 2-5GB for --poolmetadatasize should guarantee pool lifetime. At least by this time metadata area resizing should be supported I gather :)
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Andres Toomsalu
On 18.10.2012, at 16:28, Spelic wrote:
> On 10/18/12 12:30, Zdenek Kabelac wrote:
>> Dne 17.10.2012 22:21, Andres Toomsalu napsal(a):
>>> Hi,
>>>
>>> I'm aware that thin provisioning is not yet production ready (no metadata resize) - but is there a way to recover from thin pool failure when pool metadata was filled up?
>>>
>>>
>>
>>
>> Unfortunately there is no 'easy' advice for now yet - you hit current Achilles heel of thinp support in lvm2 - we are thinking how to make recovery usable for user - but it's not easy task since many things are making it very complex - so it still needs some month of work.
>>
>
> So, supposing one is aware of this problem beforehand, at pool creation
> can this problem be worked around by using --poolmetadatasize to make a metadata volume much larger than the default?
>
> And if yes, do you have any advice on the metadata size we should use?
>
> Thank you
>
>
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