HP A6828A Manual do Utilizador descarregar pdf (Página 97)

Troubleshooting

Domain Validation

Chapter 3 81

• Path width errors (for example, a Narrow cable used with a Wide

SCSI device)

• Damaged or marginal transceivers

• Excessive cross talk

• Excessive system noise

When Domain Validation determines that communication with the

target device is not possible at the maximum data transfer rate

supported by the HBA (Ultra160), it writes the following warning

message to the /var/adm/syslog.log ﬁle:

SCSI:Ultra160 SCSI Adapter at

hw_path

: fallback occurred for

target

target_ID

. Possible causes are improper termination,

improper cabling, or malfunctioning hardware. Verify the

hardware at the next opportunity.

Later, it “falls back” (lowers the transfer rate and bus width) by one level,

according to Table 3-1 below.

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 137 138

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HP A6828A Manual do Utilizador Página 97