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Building high availability Windows Server™ 2003 solutions by Jeffrey R. Shapiro

By Jeffrey R. Shapiro

This is often the definitive source for each community administrator, advisor, and architect who must maximize availability, scalability, and function in home windows server environments. Drawing on twenty years of home windows server event, Jeffrey Shapiro and Marcin Policht have written the main real looking, finished, and autonomous home windows excessive availability consultant ever released. One step at, a time, they assist you propose, enforce, and deal with clustering, load balancing, fault tolerance, SQL Server, alternate Server, and lots more and plenty extra. alongside the best way, they tackle the most important excessive availability issues which are almost overlooked through such a lot books, resembling catastrophe restoration, functionality tracking, and operations administration. Shapiro and Policht provide a transparent, concise roadmap for protecting home windows servers operating 24x7 and offering on even the main difficult service-level agreements. they supply real-world case stories and easy-to-use directions designed to assist readers make larger judgements extra quickly.

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For those architects who have a strict budget or need more memory in existing systems, you will need to know a little more about memory than you would care to. com, where you can save some bucks and get exactly what you need. All you have to do is enter a model number of your system and the Web site returns the memory best suited for your system. In fact, some vendors recommend you buy the basic RAM from them and then shop around for better deals. This helps them get you within your budget with room to shop for the same, but cheaper, memory elsewhere on the Web.

Write operations are slower because parity information needs to be calculated and written to a disk. RAID 5 operates best in situations involving frequent reads but limited writes. In database environments, it is ideal for On Line Analytical Processing (OLAP) purposes. RAID 10 This is the hybrid type that combines RAID 0 and RAID 1, which means data is written in stripes across pairs of disks, configured as mirrors. The setup requires at least four disks (two striped mirrors); however, it can gracefully handle a failure of more than one disk, as long as they are not part of the same mirror set (you can lose a single disk from each mirrored pair across the RAID 0 stripe without impact on system availability).

Technologies such as Fibre Channel or iSCSI help bypass existing distance, speed, and device addressability restrictions, providing support for distances measured in tens of kilometers, gigabit data transfer rates, and a much larger number of addressable devices. We discuss this in more detail in the sections "Storage Area Networks (SANs)" and "IP-Based Storage Solutions" later in this chapter. While software-based RAID has its benefits, it cannot really compete with high-availability solutions implemented with RAID controllers when it comes to performance, functionality, and management capabilities.

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