[CentOS] virt-install can't work with phy:/dev/bla/bla. bug or feature?

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hi list.
in centos 5 final virt-install offer only file-based disk for domUs, but in centos 5 beta I could
use phy:/dev/... I can't see any common sense in this "feature" (if it's not a bug, 'cose). Share
your considerations, please.
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