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HP-UX 11i v3 Installation and Update Guide: HP Integrity Server Blades, HP Integrity Servers, and HP 9000 Servers > Chapter 3 Choosing an Installation Method

Mass Storage Stack for HP-UX 11i v3


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HP-UX 11i v3 introduces a new representation of mass storage devices, known as the agile view. In the agile view, disk devices and tape drives are identified by the actual object, not by a hardware path to the object. In addition, paths to the device can change dynamically and multiple paths to a single device can be transparently treated as a single virtualized path, with I/O being distributed across those multiple paths.

This representation increases the reliability, adaptability, performance, and scalability of the mass storage stack, without the need for operator intervention.

HP-UX 11i v3 Hardware Paths

In HP-UX 11i v3, there are three different types of paths to a device: legacy hardware path, lunpath hardware path, and LUN hardware path. All three are numeric strings of hardware components, with each number typically representing the location of a hardware component on the path to the device. These paths are described below.

  • Legacy hardware path

    The legacy hardware path is the format used in releases prior to HP-UX 11i v3, and is displayed in the legacy view. It is composed of a series of bus-nexus addresses separated by ‘/’ leading to the host bus adapter (HBA); beyond the HBA, additional address elements are separated by ‘.’.

  • Lunpath hardware path

    The lunpath format enables the use of more targets and LUNs than are permitted under legacy hardware paths, and is printed in the agile view. It is identical in format to a legacy hardware path, up to the HBA (and represents the same path to the LUN). Beyond the HBA, additional elements are printed in hexadecimal.

  • LUN hardware path

    The LUN format is a virtualized path that represents all the lunpaths to a single LUN. It is printed in the agile view. Instead of a series of bus-nexus addresses leading to the HBA, the path contains a virtual bus-nexus (referred as the virtual root node) with an address of 64000. An example of a LUN hardware path is “64000/0xfa00/0x22”.

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