Figure 20. After the server has exported /classes/class2

After exporting, a remote client can view the exported ®le systemsPROJ2 and PROJ3.

Not all the ®le systems on the server are visible to remote clients. Only the exported

®le systems are available for mounting by clients with proper authorities as speci®ed on the export command or in the /etc/exports ®le. Remote clients can not see

anything except for their own local ®les and those that the various remote servers have exported. Before remote clients can access server data, that data must ®rst be exported and then mounted.

How Do I Export File Systems?

You can export NFS server ®le systems for mounting on a client with the CHGNFSEXP (Change Network File System Export) or the EXPORTFS CL commands.

For a discussion of speci®c special considerations regarding export procedures, please see ªChapter 9. Network File System Security Considerationsº on page 81.

Rules for Exporting File Systems

There are four conceptual rules that apply when exporting the ®le systems of an

NFS server so that they are accessible to clients:

1.Any ®le system, or proper subset of a ®le system, can only be exported from a system that runs NFS. A proper subset of a ®le system is de®ned as a ®le or directory that starts below the path of the ®le system being exported. This capability allows you to export only certain parts of large ®le systems at any one time instead of the entire ®le system all at once.

For example, /usr is a ®le system, and the/usr/public_html directory is part of that ®le system. Therefore,/usr/public_html (and all of the objects, ®les, and sub-directories located within that directory) is a proper subset of the /usr ®le system.

You might want to think of the exporting process as you would think of a river. When you throw an object into a river, it ¯ows downstream. When you export a ®le system, you also export all of the ªdownstreamº directories, ®le systems, and other objects. Just as rivers ¯ow from upstream to downstream, so do your exports.

28OS/400 Network File System Support V4R4

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IBM AS/400E manual How Do I Export File Systems?, Rules for Exporting File Systems
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AS/400E specifications

The IBM AS/400E, now more commonly known as IBM i, is a robust and versatile midrange server that has been designed to provide a comprehensive computing solution for businesses of all sizes. First introduced in the late 1980s, the AS/400 series has undergone multiple enhancements and rebranding, with the AS/400E being one of the notable iterations. This powerful platform is closely associated with IBM's commitment to reliability, scalability, and integrated business solutions.

One of the main features of the AS/400E is its highly integrated architecture that combines hardware and software into a cohesive system. This integration allows for seamless operations, reducing the complexity typically associated with managing disparate systems. The system is powered by IBM's proprietary OS/400 operating system, which has evolved into IBM i, featuring advanced capabilities like object-oriented programming, integrated database management, and security features that are essential for enterprise environments.

A key characteristic of the AS/400E is its robust database support, primarily through the use of DB2 for i. This integrated database management system enables efficient data handling and retrieval, facilitating real-time business analytics and reporting. Furthermore, the platform supports a variety of programming languages, including RPG, COBOL, and Java, making it flexible for developers who require diverse tools for application development.

The AS/400E is also known for its exceptional reliability and uptime, making it a preferred choice for critical business applications in industries such as finance, healthcare, and manufacturing. This reliability is backed by advanced error detection and correction mechanisms, as well as redundancy features that help prevent data loss and minimize downtime.

In terms of scalability, the AS/400E can effortlessly expand to accommodate growing business demands. Organizations can increase processing power by adding more resources without significant disruption. This scalability, combined with the system’s built-in virtualization capabilities, allows businesses to optimize resource usage and streamline operations.

Security is another defining feature of the AS/400E. The platform incorporates various layers of security measures, including user authentication, encryption, and comprehensive auditing capabilities, ensuring that sensitive business data is protected against unauthorized access.

Overall, the IBM AS/400E remains a powerful tool in the enterprise computing landscape, providing businesses with an integrated, reliable, and secure solution for their technological needs. Its enduring popularity is a testament to its capability to evolve with changing business requirements while maintaining its core attributes of high performance and stability.
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