HP A6829A User's Manual And Service Manual page 99

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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.
Chapter 3
Path width errors (for example, a Narrow cable used with a Wide
SCSI device)
Damaged or marginal transceivers
Excessive cross talk
Excessive system noise
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Troubleshooting
Domain Validation
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