Need help in attaching the 5th D2700 enclosure to existing DL 385 G7

Hi All,

Can anyone please help me to identify what is this unused SAS/SCSI slot in the screenshot below:



I'm trying to add the fifth D2700 enclosure but somehow I wonder if I should attach it to the empty slot 1 above or daisy chain it to the last (fourth) D2700 enclosure from screenshot below ?



Here's some more additonal details from the Storage View of System Management Homepage:

Smart Array P410i In Slot 0 (Embedded Slot)
Storage Boxes
Port 4C Box 1R
Port 2C Box 2

Smart Array P411 In Slot 2
Storage Boxes
Port 1E,2E Box 1

Smart Array P411 In Slot 3
Storage Boxes
Port 1E,2E Box 1
Port 1E,2E Box 2
Port 1E,2E Box 3
Port 1E,2E Box 4

Thanks.