I Have hyper-v 2012 hosts to which I presented luns via igroups. Then I have to uninstall NetApp DSM form the hyper-v hosts due to ms scvmm having issues with scsi3 reservations while validating cluster. After few days i was asked that if have unpresented luns from these hosts. It is test environment anyway. I did not unpresented nor anyone else.
When I checked igroup membership was revoked for these luns, do not know how and why.