Notes on Cell Administration

Administering CDS

 

Known CDS Problems

 

Resource Problems

 

It is important to configure sufficient resources for DCE according to the

 

instructions in this manual. CDS can fail if a CDS server or client system

 

runs out of system resources such as swap space, disk space, or kernel

 

resources. Symptoms usually include a cdsadv or cdsd crash with one of

 

a variety of error messages (which may not directly indicate the source of

 

the problem.)

 

If a CDS problem is linked to a shortage of resources, stop DCE, free or

 

configure more resources, and then restart DCE to bring the node back

 

on-line in the cell.

 

Clock Reversal Problems

 

Timestamps are used in the CDS database to establish the order of

CAUTION

 

events in changes to the name space. If the date/time on a DCE node is

 

manually set backward more than a few minutes, the CDS database can

 

become corrupted, crashing cdsd, and leaving the cell unusable. This is

 

unrecoverable unless you have a recent backup. It is therefore

 

imperative that manual clock resetting be avoided on DCE nodes.

 

 

7-8

Planning and Configuring HP DCE 1.7

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HP UX DCE Software manual Known CDS Problems, Resource Problems, Clock Reversal Problems

UX DCE Software specifications

HP UX DCE Software, or Hewlett-Packard UNIX Distributed Computing Environment, represents a significant tool in the realm of distributed system architecture. Designed primarily for enterprise environments, HP UX DCE enhances the reliability, scalability, and manageability of applications over diverse networked systems.

One of the main features of HP UX DCE is its ability to integrate various computing platforms, enabling seamless communication and resource sharing across distributed nodes. This facilitates the creation of complex applications that can operate on a multitude of systems, thus enhancing operational flexibility. DCE employs standardized interfaces, which means applications written for one platform can run on any other platform that supports DCE, promoting cross-platform compatibility.

In terms of technologies, HP UX DCE utilizes Remote Procedure Calls (RPC) as a core feature. This mechanism allows different applications to communicate and invoke procedures on remote systems as if they were local calls. Additionally, DCE includes a robust security model that incorporates Kerberos for authentication, ensuring that communication between nodes remains secure and protected against unauthorized access.

Another significant characteristic of HP UX DCE is its distributed file system, which allows for transparent file access across different machines. The DCE File System (DFS) provides a unified namespace and manages data replication and consistency across distributed storage resources. This reduces the complexity of data management and enhances data availability.

HP UX DCE also supports a variety of programming languages, making it accessible for developers accustomed to different coding environments. This versatility encourages widespread adoption and innovation, as developers can leverage existing skills to create distributed applications.

Furthermore, HP UX DCE is built for high availability, ensuring that critical applications remain responsive even in the face of hardware or network failures. Its inherent component redundancy and fault-tolerant architecture are designed to minimize downtime, which is essential for mission-critical applications in enterprise scenarios.

In conclusion, HP UX DCE Software provides a comprehensive framework for developing, deploying, and managing distributed applications. Its core features such as RPC support, a secure authentication mechanism, a robust file system, and cross-platform compatibility make it a vital resource for organizations aiming to leverage distributed computing effectively. As enterprises evolve, HP UX DCE stands out as an influential solution in the dynamic landscape of distributed environments.