aix 解除镜像失败，求指导？

0516-076 lreducelv: Cannot remove last good copy of stale partition.

    Resynchronize the partitions with syncvg and try again.

0516-922 rmlvcopy: Unable to remove logical partition copies from

    logical volume loglv40.

0516-1135 unmirrorvg: The unmirror of the volume group failed.

    The volume group is still partially or fully mirrored.