NEC Express5800/320Lb User Manual page 348

8-12 System Upgrade
corresponds to SCSI slots under SCSI Enclosure (ID: 11/40).
You will find that the failed disks located in SCSI slots (ID: 10/40/2) and (ID: 11/40/3) are
the 2nd disk of Group 1 and 3rd disk of Group 2, respectively.