A few pent up fixes:
- If XEN_SLICE2IMAGE attribute is specified, create a 16GB partition 2 - Reduce the fraction of space used by the thin pool, especially on non-shared hosts. - If xen-vg volume group already exists, use it. But also check to make sure thin-pool exists and create it if not. The last change allows the user to specify a blockstore on the physical host to use rather than having libvnode_xen build up its own.
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