The description of removing snapshots in "5.9.4. Deleting a Snapshot" in the Administration Guide must be updated to the following - "The new or resized volume grows to accommodate the total size of the two merged images; the new volume size will be, at most, the sum of the two merged images. To delete a snapshot, you must have enough free space in the storage domain to temporarily accommodate both the original volume and the newly merged volume. Otherwise, snapshot deletion will fail and you will need to export and re-import the volume to remove snapshots."
Assigning to Dayle for review.
I can't find mention of this in the Admin Guide, but I have found this exact paragraph in the Virtual Machine Management Guide -- I've made the fix in this guide.
This fix has been published in the 3.6 Virtual Machine Management Guide: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Virtualization/3.6/html/Virtual_Machine_Management_Guide/sect-Snapshots.html#Deleting_a_snapshot