For example, TULAB2 exports /classes/class1, which contains the directory /classes/class1/proj1. A remote client has a local directory /user, which contains the directory /user/work, which contains the directory /user/work/time. The client mounts /classes/class1/ over /user/work, which causes the mounted ®le system

to completely cover up everything on the local directory tree that is ªdownstreamº from the mount point. The mount point is /user/work. The /user/work directory now contains only proj1. Should the client try to access the data that is ªcovered up,º (/user/work/time) an error message returns to the user. Data that has been

covered by a mounted ®le system is inaccessible until the ®le system is unmounted.

Figure 35. Views of the local client and remote server

Figure 36. The client mounts /classes/class1 from TULAB2

Figure 37. The /classes/class1 directory covers /user/work

To continue this example, another remote ®le system is exported by TULAB2, /engdata. In keeping with the ªdownstreamº rule of exporting, all of the sub-directories of /engdata are also exported. The client can mount the exported

sub-directory over the mount point that already exists. When a user mounts /engdata over the directory /user/work, all of the contents of /user/work, including /user/work/proj1 become covered by the mount. This renders them inaccessible.

Chapter 5. Client Mounting of File Systems 43

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IBM AS/400E manual Views of the local client and remote server
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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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