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- Only one VM can mount/attach a disk at any time (i.e. multiple VMs cannot attach the same disk concurrently)

-  Since all hypervisors don't support this capability (for example, XS doesn't sharing NFS across multiple clusters), and a zone can be heterogeneous (from a hypervisor perspective), we need to support the capability to allow both zone-wide and cluster-only primary storage for any zone.Moreover, a single cluster needs to support both, - snapshot/restore features are similar to current semantics i.e. no degradation in features

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