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Description
lvcreate
accepts a trailing argument [PhysicalVolumePath[:PE[-PE]]...]
which can be used to restrict logical volume creation to specific physical volume(s).
This is the only really sensible way to create tiered storage for eg: cache creation, #421, but it can be useful in other complex scenarios.
Nothing prevents this from being used today via extraArguments
, but it would drop types, ie: would rely on just using the same device string in extraArguments to pv creation as one used for the lv.