SCSI Ultra320 0/3/1/1 instance 9:

Domain Validation failed, device offline.

Target ID = 2.

Restoring Performance After A Domain Validation Fallback or Failure

First, you must fix the problem with the target hardware that caused the fallback. See Table 5-1 (page 53) for a listing of the types of problems that Domain Validation can detect.

When you have corrected the problem, use the mptutil -t tgt_reset [target_id] command to restart Domain Validation for the specified target, and restore the negotiated parameters to the highest possible transfer rate and bus width. Then check the /var/adm/syslog.log file for any new fallback warning messages, such as Example 5-2 (page 54). If the problem is fixed properly and Domain Validation is at the correct level, no new warning messages will be present.

If a device has failed all fallback tests and is offline, follow these steps to restore communication to the target hardware:

1.Fix the problem with the target.

2.Run mptutil with the-t tgt_reset option.

3.Power cycle the target (power off and then power on).

4.Run ioscan without the -koption to restart Domain Validation and renegotiate the parameters for the target.

5.Check /var/adm/syslog.log for any new fallback warning messages.

The absence of new fallback messages indicates that the problem is fixed, and the data transfer rate and bus width are at the correct levels.

NOTE: When a Domain Validation test succeeds, no message is written to the /var/adm/syslog.log file. The reason is that this would generate a large volume of messages, especially on a system that is used heavily. This would make the file very large, and more important warning and error messages would not be as easy to see.

A SCSI selection timeout — when a target device does not respond to selection within a certain length of time — will terminate a Domain Validation test on a target, and the target will be considered to be non-existent. This is so a bus scan or system boot will not be extended by Domain Validation waiting several times for a target that does not exist.

NOTE: A Domain Validation test that is terminated for one target does not affect the tests being run on any of the other target devices on the SCSI bus.

Using the mptutil Command

The mptutil command is a diagnostic tool for Ultra320 SCSI controllers claimed by the mpt driver. You can use mptutil to view configuration information, issue task management commands, and read or reset accumulated statistics for the A7173A adapter and connected target devices. The mptutil command can also be used to update the A7173A adapter firmware; see “Using mptutil to Verify or Update A7173A Adapter Firmware” (page 46).

A specific device file corresponding to a single channel on an A7173A adapter is necessary to use the mptutil command. Each device file represents a single channel on the A7173A adapter. Commands issued through mptutil are channel specific and do not affect the whole adapter (except for firmware downloads). Some mptutil command options are intended for use by HP support personnel, and require detailed knowledge of the Ultra320 SCSI driver or firmware to interpret the output.

To see a help screen showing the mptutil command syntax, enter mptutil at the system prompt with no additional options:

Using the mptutil Command 55

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HP Ultra320 A7173A manual Using the mptutil Command
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Ultra320 A7173A specifications

The HP Ultra320 A7173A is a high-performance Storage Area Network (SAN) component, widely recognized for its reliability and efficiency in data storage solutions. Designed to support the demands of enterprise-level applications, this SCSI (Small Computer System Interface) controller excels in providing fast and reliable data transfer, making it a preferred choice for businesses that require robust storage solutions.

One of the standout features of the A7173A is its ultra-fast data transfer rate. It is capable of achieving speeds of up to 320 MB/s, which is made possible through the Ultra320 SCSI technology. This speed enhancement is crucial for applications requiring quick access to large volumes of data, thus improving overall system performance. The controller maintains compatibility with previous SCSI standards, allowing for interoperability in diverse environments and ensuring that organizations can leverage their existing infrastructure.

The A7173A is built on advanced technologies that enhance its performance and reliability. These include intelligent data buffering and error correction mechanisms, which minimize the likelihood of data loss and improve the integrity of information during transfers. Additionally, the controller features multiple device connections, accommodating up to 15 devices on a single chain. This scalability offers flexibility in expanding storage solutions based on organizational needs.

Another significant characteristic of the HP Ultra320 A7173A is its support for a wide range of operating systems. The controller is versatile, allowing it to integrate seamlessly with numerous enterprise platforms. This broad compatibility ensures that IT departments can deploy the A7173A within their existing environments without major adjustments or additional costs.

Moreover, the A7173A comes with comprehensive management features, enabling administrators to monitor and optimize storage performance effectively. These features help in anticipating issues before they escalate, thereby minimizing downtime and facilitating smoother operations.

In essence, the HP Ultra320 A7173A is a comprehensive SAN solution that offers exceptional speed, reliability, and scalability. Its advanced technologies and versatile compatibility make it an ideal component for organizations looking to optimize their data storage infrastructure while ensuring robust performance across diverse applications. Investing in the A7173A can lead to marked improvements in data management, ultimately contributing to business efficiency and continuity.
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