The panic will result in a additional controller reset during the upgrade, but should not cause complete loss of access to E-Series storage array. After the E-Series storage array is on 11.70x release...The panic will result in a additional controller reset during the upgrade, but should not cause complete loss of access to E-Series storage array. After the E-Series storage array is on 11.70x release, there will be signs of inter-controller communication delays in the E-Series debug queue logs (trace-buffers.7z). After the E-Series storage array is on 11.70x release, there will be signs of high volume level latency which can be found in the E-Series debug queue logs (trace-buffers.7z).
