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--alloc anywherewill allow placing e.g. two copies of a RAID1 stripe to the same physical volume. If that PV then fails, your supposedly-fault-tolerant logical volume now has a hole in it, as all copies of that stripe are lost.Yes,pvmove --alloc anywherecan be powerful, but it also allows doing some very stupid things that should normally be avoided. If you use it, you should definitely have a detailed understanding of what you are doing.