The storage BP1 SAS 报错

Dell R720 H730阵列卡 

LCD面板显示错误

Sun Dec 16 2018 07:51:36 The storage BP1 SAS A cable is not connected, or is improperly connected. Sun Dec 16 2018 07:51:34 The storage BP1 SAS B cable is not connected, or is improperly connected.

求教是线缆故障？