TAILIEUCHUNG - Managing RAID on Linux

Managing RAID on Linux covers everything system administrators need to know to put together a system that can support RAID. You will learn about the different types of RAID, along with associated technologies and issues, and how to choose the best RAID system for your needs. With a step-by-step, hands-on approach, the author guides you through the installation of either Linux software RAID or a hardware RAID card. | FAST SCALABLE RELIABLE DATA STORAGE Managing RAID on LINUX Derek Vadala o REILLY Beijing Cambridge Farnham Koln Paris Sebastopol Taipei Tokyo CHAPTER 2 Planning and Architecture Choosing the right RAID solution can be a daunting task. Buzzwords and marketing often cloud administrators understanding of RAID technology. Conflicting information can cause inexperienced administrators to make mistakes. It is not unnatural to make mistakes when architecting a complicated system. But unfortunately deadlines and financial considerations can make any mistakes catastrophic. I hope that this book and this chapter in particular will leave you informed enough to make as few mistakes as possible so you can maximize both your time and the resources you have at your disposal. This chapter will help you pick the best RAID solution by first selecting which RAID level to use and then focusing on the following areas Hardware costs Scalability Performance and redundancy Hardware or Software RAID like many other computer technologies is divided into two camps hardware and software. Software RAID uses the computer s CPU to perform RAID operations and is implemented in the kernel. Hardware RAID uses specialized processors usually found on disk controllers to perform array management functions. The choice between software and hardware is the first decision you need to make. Software Kernel-Managed RAID Software RAID means that an array is managed by the kernel rather than by specialized hardware see Figure 2-1 . The kernel keeps track of how to organize data on many disks while presenting only a single virtual device to applications. This virtual device works just like any normal fixed disk. .

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