If wipe after removal is enabled and volume zeroing fails when removing volume, it's still removed with the original data unwiped. Product bug: https://bugzilla.redhat.com/show_bug.cgi?id=1359859
Some additional details: The vulnerability was introduced to upstream codebase by dd3306d, merged on 29/05/2016. RHV customers with early access to beta versions were exposed to it in the first published beta. The next beta refresh will fix this.
Created vdsm tracking bugs for this issue: Affects: fedora-23 [bug 1370619] Affects: epel-6 [bug 1370620]
This was fixed in RHEV 4.0 GA.