Client Server Systems

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

By Jeffrey R. Shapiro

This can be 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 sensible, entire, and self sufficient home windows excessive availability consultant ever released. One step at, a time, they assist you intend, enforce, and deal with clustering, load balancing, fault tolerance, SQL Server, trade Server, and masses extra. alongside the way in which, they tackle the most important excessive availability subject matters which are almost neglected by means of so much books, similar to catastrophe restoration, functionality tracking, and operations administration. Shapiro and Policht supply a transparent, concise roadmap for maintaining home windows servers operating 24x7 and supplying on even the main tough service-level agreements. they supply real-world case reviews and easy-to-use directions designed to assist readers make higher judgements extra speedily.

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Next, the other basic level is applied to virtual disks created in the first step. RAID 30 involves striping across two or more RAID 3 arrays (each consisting of three or more disks), which means this level requires six or more disks. RAID 30, similarly to RAID 6, can handle failure of more than one disk without data loss as long as failed disks are not part of the same RAID 3 sub-array. While RAID 30 is not included in Windows Server 2003, you can create your own implementation of it by combining hardware-based RAID 3 (assuming your disk controller supports it) with Logical Disk Manager-based RAID 0, striping hardware RAID 3 volumes.

Disk space utilization in RAID 5 is better than RAID 1, and it improves with the larger number of disks involved. The formula specifying the amount of available space is simply (n-1)/n* 100% (parity information occupies space no larger than the size of a single drive participating in the array). Performance of RAID 5 depends on underlying hardware. It provides fast seek and read time comparable to RAID 0 (because no parity information is required, unless the array operates with a failed disk) in implementations where multiple disks can be accessed at the same time (which depends on the hardware 40 Part I: High-Performance Windows Computing Part I: High-Performance Windows Computing 41 capabilities).

They are typically developed by third-party vendors that manufacture the hardware. • Class drivers: Cover functionality that is common across a range of similar devices, which belong to the same category, such as disk, tape, or CD-ROM. • File System software: Implements file system functionality, which provides representation of the disk data in the form of files and folders, including their properties (for example, permissions or ownership in case of NTFS). Windows supports a number of file systems, such as FAT32, NTFS, CDFS, or UDFS.

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