1. After deleting all the LUN mappings, the “ioscan” command dispenses to read the LUN, there is error information “Parameter in CDB invalid,Alloc Len 8 < 16” in the disk array logs.
According to the SPC-4 R19 protocol: the “” must greater than 16. It shows on the figure 1 and figure two.
Figure 1 SPC-4 R19 protocol
Figure 2 SPC-4 R19 protocol
2. Therefore, it caused by the CDB format dispensed by the HBA board was wrong, the disk array reported the error, and then the host dispensed the command to read the LUN repeatedly. This phenomenon is caused by the HBA board’s own fault.