[linux-lvm] Testing ThinLVM metadata exhaustion

Gionatan Danti g.danti at assyoma.it
Tue May 3 10:05:27 UTC 2016

On 27/04/2016 13:11, Gionatan Danti wrote:
>> I absolutely agree with you that in no case metadata exhaustion can be
>> considered part of a "regular work-flow". At the same time, I often do
>> "stress test" specifically crafted to put the software/hardware in the
>> worst possible condition. In this manner, should an exceptionally bad
>> situation occour, I know how to deal with it.
>> I have another question: does this bug only happen when metadata space
>> is exausted? I am asking this because searching for other peoples with
>> the same error message, I read this bug report:
>> http://www.redhat.com/archives/dm-devel/2014-March/msg00021.html
>> The bug described in the message above does not necessarily happen at
>> metadata exaustion time, as confirmed here:
>> https://bugzilla.kernel.org/show_bug.cgi?id=68801
>> I understand that these are old (2014) bugs and that were fixed in Linux
>> 3.14 but, using thin LVM volumes in production systems (albeit with RH 7
>> only), I want to be reasonably sure that no show-stopper bug can hit me.
>> Are current RH OSes (6.7 and 7.2) immune from this bug (metadata
>> corruption even if tmeta is not full)?
>> Thanks.

Hi all,
sorry for the bump, but I would really like to have a more precise 
understanding of the quoted bug, specifically:

- if it presents itself on metadata-exhausted volumes only;
- if it can bite on non-full tmeta, are RH 6.7 and 7.2 vulnerable to it?


Danti Gionatan
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Assyoma S.r.l. - www.assyoma.it
email: g.danti at assyoma.it - info at assyoma.it
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