Storage access methods

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  • After completing this lesson, you should be able to do the following: Compare and evaluate the different storage structures Examine different data access methods Implement different partitioning methods

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  • This book would never have seen the light of day if it were not for many friends and colleagues who assisted me along the way. Some helped as technical reviewers, some as consultants, some as encouraging voices, and all as solid supporters. I am grateful to all of you. Thanks go to Frans De Jong, Santosh Doss, Brad Gilmer, Jacob Gsoedl, Mark Johnston, Greg Lowitz, Bill Moren, Harlan Neugeboren, Charles Poynton, Michel Proulx, John Schmitz, and Joanne Tracy.

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  • Computational Grids [1, 2] are large collections of resources such as computers, networks, on-line instruments, or storage archives, and they are becoming popular platforms for running large-scale, resource-intensive applications. Many challenges exist in providing the necessary mechanisms for accessing, discovering, monitoring, and aggregating Grid resources. Consequently, a tremendous effort has been made to develop middleware technology to establish a Grid software infrastructure (GSI) [2–4].

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  • Our infrastructure (Akash1 ) consists of a virtual storage system prototype designed to run on commodity hard- ware. It supports data accesses to multiple virtual vol- umes for any storage client, such as, database servers and file systems. It uses the Network Block Device (NBD) driver packaged with Linux to read and write log- ical blocks from the virtual storage system, as shown in Figure 3. NBD is a standard storage access proto- col similar to iSCSI, supported by Linux. It provides a method to communicate with a storage server over the network.

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  • All USB drives and other drives of recent vintage support logical block addressing (LBA). With LBA, blocks of storage capability are numbered sequentially beginning at zero. All blocks have the same size, again typically 512 bytes. The logical block address is often referred to as a sector address because the block size equals the capacity of a sector in a hard drive. To access the media, software specifies the logical block address to read or write to. For hard drives, the drive’s controller translates each LBA to a cylinder, head, and sector on the drive. For flash drives, the drive’s...

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  • The way the data is shared across the drives has a strong influence on performance. It’s convenient to think of the disk storage as a large number of data sectors that are addressable by number, rather like the pages in a book. The most obvious method is to divide the virtual disk into groups of consecutive sectors the size of the individual physical disks and store them in this manner, rather like the way a large encyclopaedia is divided into a number of volumes. This method is called concatenation, and sometimes JBOD (Just a Bunch Of Disks). It works well when the access to the virtual...

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  • Several seminars presented during the workshop by Drs Allan and Booth focused on feed and ingredient storage. These lectures presented information on the ideal methods of storage for feeds and feed ingredients, but recognised that for many small scale farmers in PNG the ideal is unachievable. As small-scale farmers move towards making more farm made feed and drying pellets, these issues will become more and more significant and undoubtedly cause many problems. Electrical supply and continuity is problematic in many places and access to cool- rooms non-existent.

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