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   lvconvert    ( 8 )

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Примечание (Note)

This previous command syntax would perform two different
       operations:
       lvconvert --thinpool LV1 --poolmetadata LV2
       If LV1 was not a thin pool, the command would convert LV1 to a
       thin pool, optionally using a specified LV for metadata.  But, if
       LV1 was already a thin pool, the command would swap the current
       metadata LV with LV2 (for repair purposes.)

       In the same way, this previous command syntax would perform two
       different operations:
       lvconvert --cachepool LV1 --poolmetadata LV2
       If LV1 was not a cache pool, the command would convert LV1 to a
       cache pool, optionally using a specified LV for metadata.  But,
       if LV1 was already a cache pool, the command would swap the
       current metadata LV with LV2 (for repair purposes.)