NEC Express5800 Series User Manual page 193

IMPORTANT:The status color of the SCSI slot differs depending on the
connection of mirrored hard disks:
If one of the mirrored disks was removed: Warning

If both of the mirrored disks were removed: Gray

Also, at this time, the redundant status of mirrored disks is changed to "Warning".
(3) Connect a new hard disk
Next, connect a new hard disk to the same SCSI Slot. At this time, NEC ESMPRO
Agent reports the following alert to manager. And icons related to the hard disk are
changed to the state of normal in the data viewer.
When the hard disk is connected, SCSI Slot changes the status to "ONLINE".
TIPS: You can identify the new hard disk by DevicePathID (ex. 10/40/1).
Installing and Using Utilities 5-47
[Mirror Disk]
[Alert report]