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IV. Hardware Setup
IV. Hardware Setup
AP8000 Hardware Reference Guide
Using Cascaded SCSI Backplane Boards
If installing five or more hard drives in the hot-swap bays, two SCSI
backplane
boards are required. A two-channel SCSI controller can com-
bine two separate sets of hard drives through software RAID or by
using a hardware RAID controller. Cascading the SCSI
backplane
boards
can be done to use only a single channel on the SCSI controller.
SCSI ID Setting
SCSI ID Settings for Cascaded SCSI Backplane Boards
Board SET1 SET2 Slot0 Slot1 Slot2 Slot3
Top ON OFF ID0 ID6 ID8 ID12
Top OFF OFF ID1 ID5 ID9 ID13
Bottom ON/OFF ON ID3 ID4 ID10 ID11
When using a cascade configuration, the top SCSI
backplane
board
is referred to as BP4-1 and the bottom SCSI
backplane
board is re-
ferred to as BP4-2, but there are no physical differences. The SCSI
hard drives connected on the top SCSI
backplane
board may select
from two sets of SCSI IDs. The SCSI hard drives connected on the
bottom SCSI
backplane
board may only have one set of SCSI IDs.
Separate Config. Cascade Config.
Connected to
SCSI Controller
(68-pin SCSI)
BP4 Cascade Cable
Top (BP4-1)
Bottom (BP4-2)
Automatic Termination
(no terminator required)
Connected to
SCSI Controller’s Ch2
(or another controller)