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If the control group is set to IPL after the backup, the volumes are not automatically transferred. The user needs to run media movement to transfer the volumes after the system is back online. There could be a small timing window where the transfer might be initiated while the system is coming down, but the transfer would fail and leave the volume in *TRF state. Like any other failed transfer, once the system is back online and cloud communication is reestablished, running STRMNTBRM will find and transfer any volumes stuck in *TRF state.
Why are the QCLDBIPLxxx and QCLDBGRPxx control groups not automatically created?
If the IBM Cloud Storage Solutions for i configuration is set use compression or encryption, the QCLDBIPLxx and QCLDBGRP control groups will not be created when running INZBRM OPTION(*DATA) or STRMNTBRM.