As Avishay points out, you can configure the method used via volume_clear, w/ respect to gate tests including tempest, we used to *always* zero out the volumes on delete, however 12.04 introduced an issue with kernel hangs on Ubuntu when trying to do the delete. Since then we've configured the gate tests to NOT perform the secure delete or wipe in tests and to my knowledge that's still the case.
Looking at recent gate jobs delete time on volumes is approximately 2 seconds so I don't see the issue from that perspective.
As Avishay points out, you can configure the method used via volume_clear, w/ respect to gate tests including tempest, we used to *always* zero out the volumes on delete, however 12.04 introduced an issue with kernel hangs on Ubuntu when trying to do the delete. Since then we've configured the gate tests to NOT perform the secure delete or wipe in tests and to my knowledge that's still the case.
Looking at recent gate jobs delete time on volumes is approximately 2 seconds so I don't see the issue from that perspective.