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Most companies have a solid disaster recovery plan in place to handle a "complete failure" of its Active Directory, which is really quite rare. What most recovery plans are missing, and the most common scenario, is a means to efficiently restore single directory objects. In this paper, we'll explore what most disaster recovery plans already address, highlight potential weak points, and suggest solutions that help fill those gaps-without requiring you to completely re-do your existing plan.
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Discover the benefits of paravirtualization in this informative webcast today. This server virtualization-themed webcast not only explores how to improve virtualized server performance, but provides real-world user examples, explains how to optimize workloads and discusses the future of server virtualization. Focus on only the themes that interest you or watch all six consecutively for a full picture of how you can lower your costs significantly through consolidation and virtualization. Register below to learn more and be entered to win an Archos 605 Portable Media Player.
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Two of the major features that distinguish Cisco's IOS and Juniper Networks' JUNOS operating systems are their heritage and number of versions on the market. The third is their architecture.
IOS traditionally is a monolithic operating system, which means it runs as a single operation and all processes share the same memory space. Because of the latter feature, bugs in one operation can have an impact on or corrupt other processes. In addition, if a user wishes to add features or functions to the operating system, IOS has to be deactiviated while a completely new version with the desired features is loaded.
JUNOS, on the other hand, was constructed as a modular operating system. The kernel is based on the open source FreeBSD operating system, and processes that run as modules on top of the kernel are segregated in exclusive, protected, memory space. Users thus can add features and functions to the version of JUNOS running on their systems without disabling the entire operating system — a characteristic known as in-service software upgrades that also enhances uptime and availability.
"The major difference is operational," says Jeff Doyle, president of IP consultancy Jeff Doyle and Associates, who has worked with both operating systems. "The reality is, IOS is pretty old. [JUNOS] was architecturally designed differently. It's more modern and modular, meaning bug fixes are easier and functional failures tend to be not as impactual as they are with as IOS."
The goal of Cisco's new IOS variants — IOS XR, IOS XE and NX-OS — is to overcome the monolithic limitations of the traditional IOS while addressing critical needs for increased uptime and availability in the service-provider core and edge, and enterprise data center, respectively. All these operating systems are modular, in that IOS services run as modules on top of a Linux-based kernel (in IOS XE and NX-OS), or as a third-party Portable-Operating-System-Interface (POSIX)-based real-time kernel (in IOS XR).
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This article is misleading.By Anonymous on April 26, 2008, 9:55 amThis article is misleading. There isn't one "IOS" that runs on "scores" of devices. IOS is a collection of featuresets that are coded by different teams for different...
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Commit Based ModelBy Anonymous on April 17, 2008, 8:20 amAnother thing to consider is that Juniper's JUNOS allows changes to the configuration to occur to candidate configurations and then validation checks are performed...
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