Github user mike-tutkowski commented on the issue:
https://github.com/apache/cloudstack/pull/1847
To clarify this line:
"If that comes back null, then we apparently have removed primary storage,
which can only be done if your snapshots don't reside on it. If dataStore ==
null, return DataStoreRole.IMAGE."
I meant this for managed storage. For unmanaged storage, the original
primary storage from which the snapshot came can be deleted and the snapshot
can remain.
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