Github user anshul1886 commented on the pull request:
https://github.com/apache/cloudstack/pull/68#issuecomment-70239302
If not download_url than there needs to be other entry in db to detect the
difference type of entries. But that will require the DB change and will not
achieve any extra purpose.
I didn't get second part of question as these entries are made basically to
track the state of volume.
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