Trust Red Hat :)
At least their approach should be safer.

Of course, you can raise a docu bug but RHEL7 is in such phase that it might 
not be fixed unless this is found in v8.

Best Regards,
Strahil NikolovOn Oct 2, 2019 05:43, jeremy_tourvi...@hotmail.com wrote:
>
> http://man7.org/linux/man-pages/man7/lvmthin.7.html 
> Command to repair a thin pool: 
>        lvconvert --repair VG/ThinPoolLV 
>
>        Repair performs the following steps: 
>
>        1. Creates a new, repaired copy of the metadata. 
>        lvconvert runs the thin_repair command to read damaged metadata from 
>        the existing pool metadata LV, and writes a new repaired copy to the 
>        VG's pmspare LV. 
>
>        2. Replaces the thin pool metadata LV. 
>        If step 1 is successful, the thin pool metadata LV is replaced with 
>        the pmspare LV containing the corrected metadata.  The previous thin 
>        pool metadata LV, containing the damaged metadata, becomes visible 
>        with the new name ThinPoolLV_tmetaN (where N is 0,1,...). 
>
>        If the repair works, the thin pool LV and its thin LVs can be 
>        activated, and the LV containing the damaged thin pool metadata can 
>        be removed.  It may be useful to move the new metadata LV (previously 
>        pmspare) to a better PV. 
>
>        If the repair does not work, the thin pool LV and its thin LVs are 
>        lost. 
>
> This info seems to conflict with Red Hat advice.  Red Hat says if metadat 
> volume is full don't run a lvconvert --repair operation.  Now I am confused.  
> I am familiar with LVM and comfortable with it but this is my first time 
> trying to repair thin LVM.  The concepts of a metadata volume are new to me.
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