HP Surestore Bridge FC 2/1 LV and FC 4/1 HV Installation and Operations Guide

186 Basic Verification Chapter 8
Basic Verification
SCSI Bus Configuration
Problems with SCSI bus configuration are common. Basic operation of a SCSI
bus can be checked by using the configuration menu to view attached SCSI
devices. See SCSI on page 89 for more information. Other conditions to look
for include:
■ Termination - Problems with termination can cause intermittent or hard
failures. A SCSI bus must be terminated on both ends and only at the
ends. By default, the bridge provides internal termination for each of its
SCSI buses. Internal termination may be disabled on the FC 2/1 LV so that
both SCSI connectors may be used in a “middle of the bus” configuration.
Verify that the ends of each SCSI bus is properly terminated. Termination
issues when both narrow and wide devices are on the same bus are
common.
■ Bus Type - The FC 4/1 HV bridge provides only HVD SCSI buses. Single-
ended (SE) or LVD SCSI devices cannot be supported on this bridge. Verify
that all devices are hooked up to each bus of the FC 4/1 HV are HVD
SCSI devices.
■ The FC 2/1 LV bridge provides only LVD/SE SCSI buses. HVD SCSI
devices cannot be supported on this bridge without a converter. Verify that
all devices hooked up to each bus of the FC 2/1 LV are LVD or SE devices.
Do not mix LVD and SE devices on the same SCSI bus of the FC 2/1 LV.
■ Device ID - Each device on a SCSI bus must have a unique ID. Check the
configured IDs for the bridge to verify these are not in use by other devices
on the same SCSI bus.
■ Cabling - Check SCSI cables to verify they are functional. SCSI rules for
total length, distance between devices, and stub length must be adhered
to. Connections should also be checked and reseated if necessary.
■ SCSI Devices - Verify that the SCSI devices on a particular SCSI bus can be
seen in the configuration menu of the bridge. Select
[Perform
Configuration]
from the first menu. Then select [Fibre Channel to
SCSI Mapping Configuration].
You must then enter a [1] for LUN
priority,
[2] for bus priority, or a [3] for target in order to view the list of
SCSI devices. If the bridge cannot see the devices, verify SCSI
configuration, cabling, and termination.