HP A6829A User's Manual And Service Manual page 100

Troubleshooting
Domain Validation
Table 3-1 Domain Validation Fallback Levels
NOTE The number of entries in Table 3-1 above is subject to change. We are
providing it here to give you an example of how the fallback procedure
works.
As mentioned earlier, Domain Validation tests are run on all targets on
the SCSI bus, even those targets that do not have Ultra160 capabilities.
Therefore, the starting point in Table 3-1 depends on the parameters
that were negotiated for any particular target. In addition, since a SCSI
bus can contain up to 15 targets, different SCSI parameters might be in
effect at any one time on the bus (because Domain Validation is running
on all of the targets at the same time).
If a fallback does occur and you fix the problem with the target
hardware, you need to power cycle (power off and then power on) the
target hardware and then run ioscan without the -k option (you can
specify any other options, though). This restarts Domain Validation for
that target and restores the negotiated parameters to the highest
possible transfer rate and bus width. Next, look in the
/var/adm/syslog.log file for any new "fallback" warning messages
86
Type of SCSI Bus Width
Ultra160
Ultra2 Wide
Ultra2 Narrow
Ultra Wide
Ultra Narrow
Fast Wide
Fast Narrow
Asynchronous Narrow
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Data Transfer
Rate (MB/s)
Wide 160
Wide 80
40
Wide 40
20
Wide 20
10
<5
Chapter 3