Github user nathanejohnson commented on the issue:
https://github.com/apache/cloudstack/pull/1645
@wido I don't know that the management server knows explicitly, it doesn't
actually seem to store the disk image format in the snapshot related tables at
all, only in volumes as far as I can tell. However, I don't believe the
management server ever does anything with the snapshot backup on secondary
other than deleting it whenever the corresponding snapshot is deleted, and for
that it doesn't actually care what format it's in.
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