HP AT134A/SC11Xe Host Bus Adapter Installation Guide

2. Locate the PCIe bus expansion slots, and select the slot that you want to use. (For more
information, see the server documentation.)
3. Depending on the server model, remove the retaining screw or open the expansion slot latch
that secures the PCIe slot.
4. Remove the slot cover and save it. You will need to put it back if you decide to remove the
adapter and leave the slot empty.
5. Insert the adapter into the slot, and press it firmly into place. The contacts on the adapter edge
must be fully seated in the system board connector.
6. Depending on the server model, secure the adapter by replacing the retaining screw or by
closing the slot latch.
Connecting the adapter
This adapter supports only SCSI tape devices. You can connect up to 15 devices to this adapter
through its one SCSI bus. However, you must use only one of the connectors (internal or external)
at a time. The adapter will not function if both connectors are connected to devices.
• To connect external storage see “Connecting the adapter to external storage” (page 7)
• To replace the integrated SCSI controller see “Replacing the integrated SCSI controller” (page
7)
• To connect an internal tape drive see “Connecting an internal tape drive” (page 7)
SCSI IDs and SCSI bus termination
Each device on a SCSI bus must have a unique SCSI ID ranging from 6 to 0 or from 15 to 8. The
ID value of 7 is reserved for the adapter, which has the highest priority. A device with an ID of 6
has high priority for accessing the SCSI bus, while a device with an ID of 8 has low priority. These
IDs are automatically set on HP products that support hot-plug devices. In other situations, you must
manually set the IDs by using switches or jumpers located on the device.
If you must manually set the IDs and you need to connect low- and high-throughput devices to the
same bus, maximize bus performance by assigning higher SCSI priority to the low-throughput
devices. This configuration enables the low-throughput devices to have access to the bus.
Both ends of a SCSI bus must be terminated to prevent signal degradation. Some devices (for
example, this adapter) automatically provide termination at one end when they are connected to
the bus. The situation for other devices is as follows:
• Non-hot-plug internal Ultra320, Ultra160, and Ultra2 tape drives require multimode or LVD-only
termination on the ribbon cable.
• Hot-plug drives do not require termination on the ribbon cable because terminators are included
on the drive backplane.
• Some HP tape storage systems provide termination. To determine whether a particular storage
system provides termination, see the storage system documentation.
SCSI cables
SCSI cables are provided with most HP server products that need them. The following table lists
some external cables that you can use with this adapter. For internal connections, the adapter uses
a standard ribbon cable. All HP cables are keyed so that they cannot be installed incorrectly.
Part numberDescription
341174-B211.8-m (6-ft) VHDCI-to-VHDCI external
341175-B213.7-m (12-ft) VHDCI-to-VHDCI external
6 Installation procedure