Hello, dear.
The L01 error means the SAS link is at fault, So you can check the information as follows to solve the issue:
1. Whether the SAS cable is incorrectly connected.
Please make sure to use a portA cable to connect portA on the RAID controller card to portA on the hard disk backplane. Connect the port B cable to port B of the RAID controller card and port B of the hard disk backplane.
2. The SAS cable is faulty.
You can try to use another SAS cable.
3. The RAID controller card is faulty.
4. The hard disk backplane is faulty.
Hope this can help you!