the issues associated with migrating applications from proprietary Unix, Microsoft Windows, and other Red Hat operating system environments. Table of Contents Introduction ….. 3 What is Red Hat Enterprise Linux? ….. 4 Application Availability …..

What is Red Hat Enterprise Linux? The Red Hat Enterprise Linux product family is a suite of powerful enterprise operating system solutions that are designed for commercial and mission critical applications. Currently, the family of products comprises: Red Hat Enterprise Linux AS. This is the high-end server product, suitable for large departmental and corporate server deployments. Red Hat Enterprise Linux ES. This is the entry-level and mid-range server product, suitable for most small system and departmental deployments. Red Hat Enterprise Linux WS. This is the client-side, desktop partner to the server products. It is suitable for standard desktop productivity and technical/commercial workstation applications. Red Hat continuously enhances the Enterprise Linux family, working to provide a high-value open source operating system environment that delivers all the capabilities traditionally associated with proprietary operating systems. The following points outline the major technical and non-technical features of the family: Performance/Scalability All current Red Hat Enterprise Linux, version 3, products are based on Linux Kernel 2.4.21, enhanced with numerous features backported from the 2.5/2.6 development kernels that have been hardened for use in commercial systems. New features include: Native POSIX Thread Library ñ this Red Hat-designed implementation provides a fully POSIX-compliant multi-threading API. Performance is several orders of magnitude higher than previous multi-threading implementations, making it practical to deploy heavily multi-threaded applications (such as Java applications) in a Linux environment. Increased SMP scalability ñ the SMP subsystem has been enhanced to support up to 16 logical processors, double the number supported in version 2.1. SMP Scheduler enhancements ñ the scheduler has also been enhanced to support hyperthreaded CPUs intelligently. This work follows on from scheduler enhancements implemented in version 2.1. Bounce Buffer Elimination - this feature, which eliminates I/O buffer copy operations, was originally provided in version 2.1 for systems with 1-4GB of main memory. In version 3, it has been enhanced to support direct I/O capabilities for systems with more than 4GB of memory. 4GB-4GB virtual memory split ñ this feature, developed for X86 systems, increases the virtual address space of the kernel from 1GB to 4GB and of every user process from 3GB to almost 4GB (3.7GB). The increased kernel address space allows the kernel to manage much larger physical….

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