Exporting Considerations

 

Mounted File System Loops

 

Users and administrators can encounter difficulty with the inability of NFS to export

 

an already-mounted Network File System. NFS will not allow the export of a

 

mounted ®le system because of the possibility of mounted ®le system loops. This

 

problem would occur if NFS allowed the mount and then new clients mounted the

 

namespace. The new clients would then discover that to ®ndthe mount point, they

 

would have to pass through the mount point. They would never get to the bottom of

 

the directory, which would keep recycling the path to in®nity. The mount daemon

 

would run into a never-ending string, thus causing client failure.

 

Mounted File System Loops Solution

 

This problem will not occur because NFS will not allow the export of an

 

already-mounted NFS ®le system.

 

Symbolic Links

 

The Network File System supports the use of symbolic links. Symbolic links are

 

the representations of path names that are in the form of a path contained in a ®le.

 

The actual path is determined by doing a path search based on the contents of the

 

®le.

Two path names can lead to the same object because one is a symbolic link. For

example, the directory /nancy can contain a symbolic link to /home/grad/kathryn so

that the path to an object in /home/grad/kathryn can also be /nancy. The two path

names are the same. If a user exports both entries, then both will export normally.

Exporting /home/grad/kathryn is the same as exporting /nancy. NFS exports

objects, and not path names, so the last occurrence of the object export will be the

only one that requires saving in the export table.

 

For more information about symbolic links, see Integrated File System Introduction,

 

SC41-4711.

38OS/400 Network File System Support V4R4

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IBM AS/400E manual Exporting Considerations, Mounted File System Loops Solution, Symbolic Links
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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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