Why is the uuid of the storage pool changed just by restarting the libvirtd?

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Issue

Why is the uuid of the storage pool changed just by restarting the libvirtd?
Is this behavior expected? If so, what is it for?
Please tell us how to make the uuid persistent.

Environment

Red Hat Enterprise Linux 6 Update 3
Architecture: x86_64
Kernel Version: 2.6.32-279.el6

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