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Today if you extend a cluster VG through smit hacmp or by command cl_extendvg the disk will be added even it is used already on another system. In non PowerHA environments (extendvg) this is avoided and you would have to force the command.
In PowerHA, it should also be prevented that a used disc can simply be added if there is a valid VGDA. Otherwise a simple type can destroy your data.
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