Configuring HP DCE Cells

Integrating DCE Services with MC/ServiceGuard

First, the DCE service monitor checks to see if the server is running, and, if it is not, the DCE service monitor starts it. Then, the DCE service monitor goes into a loop and checks to ensure that the server process is running. Finally, the DCE service monitor performs a DCE level ping on the server interface.

rc.dcepkg.log—a log file that is created in the package directory during DCE package startup through MC/ServiceGuard, individual DCE services restart upon failure, and package failover.

Planning for the DCE Package

When planning for a DCE-MC/ServiceGuard installation, keep the following considerations in mind:

•Enough disk space to hold the DCE installation, log files, and core files should be allocated in the logical volumes assigned to the package. See Chapter 3 of this manual for recommendations regarding disk space requirements.

•Every node in the cluster will need to be configured with adequate swap space for a DCE server configuration. The minimum recommended swap space is 100MB, but this figure may need to be modified based on actual need. The kernel configuration should be validated on an operational system and adjusted if necessary.

•Network switching and package switching should normally be enabled. Depending on the services included in the package and the requirements of the system, node and service fail fast may be enabled as well.

•There are a number of different ways to define the DCE package. The simplest way is to include the execution of the rc.dce start script at the end of the package run script, the dce_shutdown utility at the start of the package stop script, and a definition of a simple monitoring script as the “service” to be executed This simple monitoring script should periodically check for the existence of the configured DCE servers, and return with a non-zero exit status if any of the servers fail.

Planning and Configuring HP DCE 1.7

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HP UX DCE Software manual Planning for the DCE Package
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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.
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