Figure 17 Agile multiple path I/O stack addressing model

Persistent DSF

LUN

Legacy DSF Hardware path hardware path

Legacy DSF

 

 

Hardware path

 

 

 

 

 

 

 

 

 

Lunpath hardware path

Lunpath hardware path

Lunpath hardware path

Lunpath hardware path

LUN

The persistent DSF represents the device, regardless of its location in the I/O configuration. With the new model, legacy DSFs and hardware paths enjoy multi-path capabilities because after device open, I/Os use every path associated with the I/O device.

The LUN hardware path is virtualized, representing all the lunpath hardware paths to a device. The lunpath hardware path is the path typically displayed in the Ignite user interface. Lunpath hardware paths do not have device special files - they are associated with a LUN hardware path and are accessed via the persistent DSF associated with a LUN hardware path. The Ignite user interface displays the lunpath hardware path so the actual device can be discerned from it; you cannot identify the physical device from looking at the LUN hardware path or the persistent DSF.

Sample agile addressing model values for the DSFs and paths are shown below.

Figure 18 Agile naming example

LUN

Hard-

Persistent DSFware Path

/dev/disk/disk55

Legacy DSFs

Legacy Hardware Paths

 

 

 

 

 

 

 

 

 

/dev/dsk/c9t0d1

 

 

 

0/0/6/0/0.1.18.73.0.0.1

 

64000/0xfa00/0x6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/dev/dsk/c11t0d1

 

 

 

0/0/6/0/0.1.19.75.0.0.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/dev/dsk/c17t0d1

 

 

0/0/10/0/0.1.18.73.0.0.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/dev/dsk/c19t0d1

 

 

0/0/10/0/0.1.19.75.0.0.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/dev/dsk/c29t0d1

 

 

1/0/2/0/0.1.19.75.0.0.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/dev/dsk/c27t0d1 1/0/2/0/0.1.18.73.0.0.1

/dev/dsk/c37t0d1 1/0/14/0/0.1.18.73.0.0.1

/dev/dsk/c33t0d1 1/0/14/0/0.1.19.75.0.0.1

Lunpath Hardware Path

0/0/6/0

0.0x50060b000019bc98.0x4001

0/0/6/0

0.0x50060b000019c8a6.0x4001

0/0/10/0

0.0x50060b000019bc98.0x40010

0/0/10/0

0.0x50060b000019c8a6.0x40010

1/0/2/0

0.0x50060b000019c8a6.0x4001

1/0/2/0

0.0x50060b000019bc98.0x4001

1/0/14/0

0.0x50060b000019c8a6.0x40010

1/0/14/0

0.0x50060b000019bc98.0x40010

LUN: WWID 0x50060b000015330f0001000000000032

Identification of devices in a multiple path I/O configuration can be challenging. The I/O stack (driver) identifies devices using unique LUN IDs. Often this is a WWID value.

By identifying a device using the unique LUN ID, any of its hardware paths can be used to access it, and agile addressing is supported.

The unique LUN ID might be difficult for a user to associate with a specific physical or logical device. For example, often the device WWID is on a device label (e.g. on a sticker) or available via storage management software used to set up a virtual LUN – those values are difficult to remember and type correctly. It might be easier to select a device using one of its hardware paths.

72 Managing I/O for installation and recovery

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HP UX System Management Software manual Agile multiple path I/O stack addressing model

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.