Complete the Procedure
Overview Drives can be daisy‐chained together to add multiple drives to a partition. If your library configuration includes direct‐attach SCSI drives and you plan to daisy‐chain two or more drives in a DBA on a single SCSI bus, you must connect the drives and the bus expansion module before you begin configuring partitions. Read the individual User Guides to learn more about the bus expansion module and the role it plays in the library.
Note: Do not connect the bus expansion module to the host until after you finish configuring the partitions.
Single SCSI BUS Configuration Up to four drives in a single DBA can be daisy‐chained on a single SCSI bus. Keep in mind that each drive increases the total length of the SCSI bus. Daisy chaining all four drives in a DBA results in an internal bus length of approximately 20 feet (6 meters), which must be subtracted from the maximum allowed length of 39 feet (12 meters) for an LVD SCSI bus.
Note: A maximum of 16 devices, including the four drives in a DBA, can be connected to a single wide LVD SCSI bus. Attaching more than two devices to a single SCSI bus can potentially have a negative impact on the performance of all devices on the bus.
Figure 13 illustrates daisy chaining all four drives in a DBA on a single
SCSI bus and connecting them to one host.
Drive Bay Assembly | Bus expansion |
| module |
18
Drive 3 | Drive 4 |
Drive 1 | Drive 2 |
Internal SCSI connection (DBA to drive)
LVD SCSI cable
External SCSI connector (Bus expansion module or drive)
Internal SCSI connector (DBA to drive)
SCSI terminator
Figure 13 Daisy-chaining direct-attach SCSI drives in a DBA on a single SCSI bus.
Drive Installation or Replacement Instructions | 91010010 |
