Github user mike-tutkowski commented on the pull request: https://github.com/apache/cloudstack/pull/1016#issuecomment-152785924 What I did was run a Marvin test I have that creates a VM whose root disk is placed on managed storage. The test then creates a hypervisor snapshot of the VM. Before my Marvin changes, the test was failing (and the root disk was being corrupted). Now that Marvin has been enhanced, the hypervisor snapshot reserve value is being passed to CloudStack from Marvin successfully and the overall test passes. The hypervisor snapshot reserve field is ignored by non-managed storage, so this change should not impact that type of storage.
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