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When lvm2 is activating layered pool LV (to basically keep pool opened, the other function used to be 'locking' be in sync with DM table) use this LV in read-only mode - this prevents 'write' access into data volume content of thin-pool. Note: since EMPTY/unused thin-pool is created as 'public LV' for generic use by any user who i.e. wish to maintain thin-pool and thins himself. At this moment, thin-pool appears as writable LV. As soon as the 1st. thinLV is created, layer volume will appear is 'read-only' LV from this moment.