HP PCIe U320 SCSI Host Bus Adapter - Manual (Page 14)

WARNING!
When installing the adapter in a server in a rack, to reduce the risk of personal injury or damage to the
equipment, adequately stabilize the rack before extending a component outside the rack. Extend only
one component at a time. A rack may become unstable if more than one component is extended.
The installation procedure involves the following steps:
1. Planning the installation (see page 14)
2. Preparing the server (see page 16)
3. Installing the adapter hardware (see page 17)
4. Connecting the devices (see page 17)
5. Validating the SCSI bus (see page 19)
Planning the installation
To minimize system downtime, plan the installation before powering off the server:
1. Plan the SCSI busses.
The adapter has two channels. When planning your SCSI busses, keep the following in mind:
• Total bus cable length varies by the type of attached devices. See
Table 2 for details on maximum
cable length. See the documentation for your devices to find the cable length inside the device.
Table 2 SCSI capabilities
Max. bus length in meters SCSI standard Bus speed
MB/sec. max.
Bus width bits
Single-ended LVD
Max. device
support 1
SCSI-1 5 8 6 — 8
Fast SCSI 10 8 3 — 8
Fast Wide SCSI 20 16 3 — 16
Wide Ultra/WIDE
SCSI
40 16 1.5 — 8
Wide Ultra/WIDE
SCSI
40 16 3 — 4
Ultra2 SCSI 80 16
—
12 16
Ultra160 SCSI 160 16 — 12 16
Ultra320 SCSI 320 16 — 12 16
1 Including the HBA.
• If you combine wide 16-bit and narrow 8-bit devices on the same SCSI bus, connect the wide
devices first (closest to the connector).
• Refer to the documentation for your SCSI devices to determine whether they are Ultra2, Ultra160,
or Ultra320 SCSI.
NOTE:
HP recommends not mixing Single-Ended and LVD devices on the same bus because the host adapter
card will operate with Single-Ended signaling at UltraSCSI speeds, which will significantly decrease the
speed of high-performance tape drives.
2. Plan the SCSI device termination.
14 Installation