Dne 20. 10. 20 v 18:33 Scott Moser napsal(a):
When I create an lvmthinpool with size S and poolmetadatasize P,
it reduces the available freespace by S+2P. I expected that to
be S+P. Where did the extra poolmetadatasize get used?
See below for example.
before lvcreate we had 255868 free, after we had 254588.
The difference is 1280. (1024 + 2*128).
lvm2 preallocated hidden _pmspare volume which has the size of
biggest metadata LV in a VG.
Such LV is used for automated 'lvconvert --repair'.
If you don't want this LV to be created you can add
--poolmetadataspare y|n
but in this case you are fully in your own to figure out,
where to take the space for repaired metadata.
You can also at any time lvremove _pmspare LV if necessary.
Regards
Zdenek
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