HP SCSI Host Bus Adapters User Manual download pdf (Page 53)

5. If the A7173A adapter firmware is not current, install the latest firmware, see “Using mptutil

to Verify or Update A7173A Adapter Firmware” (page 46).

a. Use the mptutil <dev_file> command to display information about the controller.

b. Examine the “Chip Information” section of the mptutil output to determine if the

driver state is “operational.”

6. If the driver state is still not operational, or if the firmware did not require an update, then

the card may be faulty. Contact your HP support representative.

No Target Devices are Displayed in the ioscan Output

If the A7173A adapter is claimed, but no target devices are displayed in the ioscan output,

check the system log (syslog) for error messages from the mpt driver. The error messages may

provide some clues about the source of the problem. For information on how to view the system

log, see the syslogd(1M) manpage.

Confirm SCSI Parameters

You can ensure compatibility between the SCSI controller and SCSI devices using the commands

available for setting and displaying the appropriate SCSI bus parameters, including the SCSI

IDs.

There are separate procedures for setting and confirming the SCSI parameters offline and online.

See Chapter 3: “Configuring the A7173A Adapter” (page 23), for details.

Domain Validation

Domain Validation automatically detects, and if necessary, compensates for hardware that is

not performing at the optimal level. It does this by reducing the data transfer rate and bus width.

This maintains data integrity, even if data transfers cannot occur at the maximum data transfer

rate supported by the adapter. If Domain Validation reduces the transfer rate and the bus width,

a message is generated to alert you to the problem.

Domain Validation is automatically enabled for all SCSI devices on the bus, as long as the adapter’s

maximum data transfer rate is set to 160 MB/s or higher. See “About the Maximum Data Transfer

Rate” (page 24), for more information on setting the adapter’s transfer rate.

Domain Validation runs each time the initiator and target devices negotiate the transfer rate and

bus width. Events that can cause Domain Validation to run are:

• A protocol violation or some other exception condition that occurs on the SCSI bus

• A SCSI device that is powered on, and then I/O occurs to that device

Table 5-1 shows the types of problems that Domain Validation can detect:

Table 5-1 Problems Detected By Domain Validation

Possible CauseProblem

A missing or bad terminator, or an incorrect auto termination setting.Incorrect SCSI bus termination

Incorrect hardware configuration

An incorrect cable type.Cables with the wrong impedance

A broken wire within a cable, or a bad connector.Major cable errors

SCSI device spacing problems

For example Narrow cable used with a Wide SCSI device.Path width errors

Damaged or marginal transceivers

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HP SCSI Host Bus Adapters User Manual Page 53