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34 Connecting and Powering on the Library Chapter 1
SCSI Cable Connections
Note Refer to Fibre Channel Cable Connections on page 41 if the
library is configured with Fibre Channel.
This section illustrates a standard SCSI configuration that produces a high level
of data storage performance (one SCSI host bus adapter card for each drive in
the library with the library controller daisy-chained to the first drive). HP
supports up to two drives per SCSI host bus adapter, but recommends only one
drive per bus. If compression is used when attaching two drives per bus, keep
in mind the combined transfer rate of the drives and the overhead of the bus
must not exceed the throughput of the host bus adapter used.
Note Dual port cards are available and will reduce slot usage in the
host system.
Connect the library as follows (refer to Figure 16 on page 36 through Figure
19 on page 39):
1. Properly power off all peripheral devices connected to the host computer.
2. Power off the host. If the host is connected to a network, check with the
system administrator before turning off power.
3. Connect a 68-pin jumper cable from the top connector of the library
controller to the left drive module on level 1 (drive module 1).
Caution Use SCSI cables and HVDS differential terminators for high-
voltage SCSI interfaces. Use SCSI cables and LVDS differential
terminators for low-voltage SCSI interfaces. The label on the
library controller indicates high or low voltage.
4. Connect the appropriate 68-pin SCSI terminator to the bottom connector
on the library’s controller card.
5. Connect a 68-pin SCSI cable from a host SCSI card to each drive module.
Add the appropriate terminators to the remaining SCSI connectors.