Recovery and the agile view

During recovery, Ignite-UX C.7.x makes changes to the new system I/O configuration to match the original system I/O configuration. This is necessary because some aspects of a system configuration depend on the unpredictable order of system I/O inventory.

The overall goal of this process is to make the system I/O configuration appear as if the system simply rebooted at the time the recovery archive was created. This process is complex, and Ignite-UX might be unable to fully restore the I/O configuration. Ignite might not be able to restore aspects of the I/O configuration due to hardware changes, limitations of system I/O software, and limitations of Ignite-UX.

The system I/O configuration must be verified during and after recovery so configuration adjustments can be made if needed.

One part of restoring the I/O configuration is the appropriate matching of device special files (DSFs) and devices. There is one approach used for legacy DSFs in HP-UX 11i v3 and previous releases, and another approach used for HP-UX 11i v3 persistent DSFs.

Legacy DSFs and device matching

Matching legacy DSFs and mass storage devices is done based on hardware paths. Generally, legacy DSFs are associated with a particular hardware path. During recovery, a device is associated with its hardware path's DSF. (See Figure 16 (page 71) for a description of the legacy addressing model.)

Hardware configuration changes are handled by assuming a new device is intended to replace the device originally at that hardware path.

Note that some I/O protocols, such as SAS and USB, associate legacy DSFs with specific devices using unique LUN IDs, and so behave like persistent DSF matching described below.

SAS devices are a special case, since their legacy DSF/unique LUN ID association can change as a result of I/O configuration changes. If you change a SAS configuration (physically move a SAS device to another bay or remove a SAS device) the hardware path associated with that and other SAS devices can change during an installation or recovery. In such a case, hardware paths are reassigned to SAS devices. Since legacy DSFs are associated with a particular hardware path, a change in a device's hardware path breaks the association between its previous legacy DSF and its unique LUN ID. Note that the way SAS devices are associated during recovery might change in future versions of Ignite-UX to use the agile addressing approach described below.

Only certain SAS configuration changes cause remapping of hardware paths. For more information see the white paper, “Ignite-UX and SAS Devices” available at http://www.hp.com/go/ ignite-ux-docs.

Persistent DSFs and device matching

Matching persistent DSFs and mass storage devices is relatively complex due to agile addressing. Ignite-UX will attempt to simulate agile addressing during recovery, while also dealing with hardware replacement. This matching is accomplished using the methods described below:

•WWID — Matching is done based on the unique LUN ID of the device. Most often, this is the device's WWID. This method matches a device's original persistent DSF with the same device in the recovered system configuration.

•Device ID — (Future) Matching is done based on a user-definable identifier written to the device. This method matches a device's original persistent DSF with the device that has the same device ID in the recovered system configuration. This method allows user-provided identification to control device matching. Note that some mass storage devices do not support the device ID feature.

•Physical Location — Matching is done based on device physical location. This method matches the original persistent DSF associated with a particular physical location (e.g. same enclosure

80 Managing I/O for installation and recovery

UX System Management Software specifications

HP-UX System Management Software is a robust suite of tools designed to facilitate the administration and management of HP's Unix-based operating system, HP-UX. As organizations increasingly rely on mission-critical applications, the need for a reliable and efficient management solution becomes paramount. HP-UX provides a comprehensive understanding of system performance, resource utilization, and enterprise-wide configuration, all while maintaining high availability and security.

One of the key features of HP-UX System Management Software is its Advanced System Administrator Toolkit. This toolkit includes a wide array of utilities that streamline daily administrative tasks such as monitoring system performance, managing user accounts, and configuring system settings. Tools such as Glance provide real-time monitoring of system resources, enabling administrators to identify bottlenecks and optimize performance.

The software also boasts an advanced security framework, including features such as Role-Based Access Control (RBAC) and Secure Shell (SSH) for secure data transmission. Security patches and updates can be managed through HP’s Service Pack for HP-UX, which provides a streamlined method for maintaining system integrity and compliance with various regulatory standards.

Another notable aspect is the extensive support for virtualization technologies. HP-UX supports HP’s Integrity Virtual Machines (IVMs) and vPars, allowing administrators to create multiple isolated environments on a single physical server. This not only enhances resource utilization but also improves disaster recovery planning by enabling easier backup and restore processes.

For storage management, HP-UX offers tools that enable easy setup and management of Logical Volume Managers (LVM). This allows simplified disk space allocation and management, ensuring that critical applications have the necessary resources without manual intervention.

Furthermore, HP-UX is designed with compatibility in mind, supporting a wide range of third-party applications and frameworks. Integration with management platforms like HP System Insight Manager enhances the ability to monitor and manage systems from a centralized perspective, providing alerts and reports that help in proactive decision-making.

In summary, HP-UX System Management Software delivers a streamlined approach to system administration, focusing on performance, security, and ease of management. Its advanced features, combined with an emphasis on virtualization and storage management, make it a powerful tool for organizations seeking reliability and efficiency in their Unix-based environments. As businesses continue to evolve, tools like HP-UX will remain crucial for ensuring consistent performance and operational excellence.