We've disabled cleaning because it takes time and may be surprising for users. However, we need to at least provide a way to enable it back, as not wiping disks causes problems like https://bugzilla.redhat.com/show_bug.cgi?id=1244056 (and a few more).
Upstream blueprint: https://blueprints.launchpad.net/tripleo/+spec/re-enable-cleaning
*** Bug 1244056 has been marked as a duplicate of this bug. ***
This landed with a slightly modified scope: cleaning now works out-of-box, if enabled by setting "clean_nodes = True" in undercloud.conf. We need a separate RFE if we want it by default.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.