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RAID6 LVs may not be created with --nosync or data corruption may occur in case of device failures. The underlying MD raid6 personality used to drive the RaidLV performs read-modify-write updates on stripes and thus relies on properly written parity (P and Q Syndromes) during initial synchronization. Once on it, enhance test to create/extend more and larger RaidLVs and check sync/nosync status.