Adaptec FS4500 User Guide - Page 67

Ultra320 SCSI Split-bus Configurations, Split-bus SCSI IDs

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Ultra320 SCSI Storage Enclosures Ultra320 SCSI Split-bus Configurations Note: The Ultra320 Storage Enclosure does not support daisychaining JBOD shelves. A split-bus configuration has two separate busses with up to six disk drives on each bus. In this configuration, the enclosure has an I/O module in one I/O slot, and an I/O blank in the other. The busses can connect to the same host or to two different hosts. Note: The I/O blank must be installed to maintain adequate airflow and cooling in the enclosure. If you are not populating all drive slots on the enclosure, you must install carrier blanks in the empty slots to maintain adequate airflow and cooling. Split-bus SCSI IDs The Ultra320 SCSI Storage Enclosure's SCSI IDs are hard set and cannot be changed. In a split-bus enclosure, each bus has seven SCSI IDs. SCSI ID 6 on each bus is reserved for the host. The I/O module has SCSI ID 15. Table 7-1 shows the SCSI ID assignments for a split bus: Table 7-1 SCSI ID Assignments for a Split Bus Slot 12 ID 0 (Bus 2) Slot 11 ID 1 (Bus 2) Slot 10 ID 2 (Bus 2) Slot 9 ID 3 (Bus 2) Slot 8 ID 4 (Bus 2) Slot 7 ID 5 (Bus 2) Slot 6 ID 0 (Bus 1) Slot 5 ID 1 (Bus 1) Slot 4 ID 2 (Bus 2) Slot 3 ID 3 (Bus 1) Slot 2 ID 4 (Bus 1) Slot 1 ID 5 (Bus 1) Note: SCSI IDs 6 and 7 are not used; they are reserved for host connections. SCSI ID 15 is assigned to the I/O module. 7-4

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7-4
Ultra320 SCSI Storage Enclosures
Ultra320 SCSI Split-bus Configurations
Note:
The Ultra320 Storage Enclosure does not support daisy-
chaining JBOD shelves.
A split-bus configuration has two separate busses with up to six
disk drives on each bus. In this configuration, the enclosure has an
I/O module in one I/O slot, and an I/O blank in the other.
The busses can connect to the same host or to two different hosts.
Note:
The I/O blank must be installed to maintain adequate
airflow and cooling in the enclosure.
If you are not populating all drive slots on the enclosure, you
must install carrier blanks in the empty slots to maintain
adequate airflow and cooling.
Split-bus SCSI IDs
The Ultra320 SCSI Storage Enclosure’s SCSI IDs are hard set and
cannot be changed.
In a split-bus enclosure, each bus has seven SCSI IDs. SCSI ID 6 on
each bus is reserved for the host. The I/O module has SCSI ID 15.
Table 7-1
shows the SCSI ID assignments for a split bus:
Note:
SCSI IDs 6 and 7 are not used; they are reserved for host
connections. SCSI ID 15 is assigned to the I/O module.
Table 7-1
SCSI ID Assignments for a Split Bus
Slot 12
ID 0 (Bus 2)
Slot 9
ID 3 (Bus 2)
Slot 6
ID 0 (Bus 1)
Slot 3
ID 3 (Bus 1)
Slot 11
ID 1 (Bus 2)
Slot 8
ID 4 (Bus 2)
Slot 5
ID 1 (Bus 1)
Slot 2
ID 4 (Bus 1)
Slot 10
ID 2 (Bus 2)
Slot 7
ID 5 (Bus 2)
Slot 4
ID 2 (Bus 2)
Slot 1
ID 5 (Bus 1)