HP Network Storage Router m2402 - Manual (Page 196)

Basic Troubleshooting
202 Network Storage Router M2402 User Guide
Verifying SCSI Bus Configuration
Items to check include:
■ Termination—Problems with termination can cause intermittent or hard
failures. A SCSI bus must be terminated on both ends. Termination problems
are common when both narrow and wide devices are on the same bus.
■ Bus Type—On an LVD SCSI module, SE and LVD devices can be connected
to the same bus. However, if one SE device is detected during power up,
communication to all devices will convert to SE mode.
Caution: Do not mix LVD/SE and HVD devices on the same module. Failure
to heed this caution may result in severe damage to equipment.
■ Device ID—Each device on a SCSI bus must have a unique ID. Verify
configured IDs 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 followed.
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 router. If the router cannot see the
devices, verify SCSI configuration, cabling, and termination.
Verifying Fibre Channel Connection
Note: By default, the Fibre Channel port speed is set to 1 Gb/s. Changes to the Fibre
Channel port speed must be manually set, such as for 2 Gb/s. If set incorrectly and
plugged into a Loop or Fabric, the unit may receive Framing errors due to the incorrect
Fibre Channel link speed.
If SCSI devices are recognized on the SCSI buses, but do not appear to the FC
host, it may be that the FC link is not properly established. Most hubs and
switches have link indicators showing link status. When the router is connected
and powered on, this link indicator should show a good link. If it does not, check
the cabling or connections.