[linux-lvm] Check of pool ernie/cache failed (status:1). Manual repair required!

Marian Csontos mcsontos at redhat.com
Tue Jun 5 08:14:16 UTC 2018

On 06/04/2018 01:50 PM, Dennis Schridde wrote:
> Hello!
> On Tuesday, 15 May 2018 13:15:55 CEST Zdenek Kabelac wrote:
>> To get direct access to metadata - you could use your latest lvm2 2.02.177
>> build (or even 'git master'). In these recent versions there is added
>> support to activate directly these 'subLVs'.  So with latest lvm2 you can:
>> lvchange -ay  vg/lv_cmeta
> This command was only successful in LVM 2.02.178-rc1, but failed in 2.02.177.
>> and then you can capture content of this LV via 'dd' into file
>> and compress and attach 'xz' compressed to BZ.
> I created a report in bugzilla [4], but since the `cache_cmeta` LV appears to
> contain parts of my personal files, I cannot attach it.  However, I gained

It definitely should not. _cdata is where fragments you your data are 
stored, and _cmeta contains only metadata (e.g. counters and references 
to cdata.)

If there really are fragments of data in _cmeta LV, something must have 
gone wrong elsewhere.

> access to the metadata LV now and would be able to provide you access to
> certain specific parts of it, if requested.
> My goal is still to gain access to as much of the data as possible.
> --Dennis
> [4]: https://bugzilla.redhat.com/show_bug.cgi?id=1585670
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