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Home > Art, Film & Photography > Storage Virtualization: IBM San Volume Controller, Comparison of Iscsi Targets, EMC Invista
Storage Virtualization: IBM San Volume Controller, Comparison of Iscsi Targets, EMC Invista

Storage Virtualization: IBM San Volume Controller, Comparison of Iscsi Targets, EMC Invista


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About the Book

Chapters: Ibm San Volume Controller, Comparison of Iscsi Targets, Emc Invista. Source: Wikipedia. Pages: 30. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: Storage virtualization is a concept in IT System Administration, referring to the abstraction (separation) of logical storage from physical storage so that it may be accessed without regard to physical storage or heterogeneous structure. This separation allows the Systems Admin increased flexibility in how they manage storage for end users. Virtualization of storage helps achieve location independence by abstracting the physical location of the data. The virtualization system presents to the user a logical space for data storage and itself handles the process of mapping it to the actual physical location. The actual form of the mapping will depend on the chosen implementation. Some implementations may limit the granularity of the mapping which itself may limit the capabilities of the device. Typical granularities range from a single physical disk down to some small subset (multiples of megabytes or gigabytes) of the physical disk. In a block-based storage environment, a single block of information is addressed using a logical unit identifier (LUN) and an offset within that LUN - known as a Logical Block Address (LBA). The address space mapping is between a logical disk, usually referred to as a virtual disk (vdisk) and a logical unit presented by one or more storage controllers. The LUN itself may be also a product of virtualization in a different layer. The virtualization software or device is responsible for maintaining a consistent view of all the mapping information for the virtualized storage. This mapping information is usually called meta-data and is stored as a mapping table. The address space may be limited by the capacity ne...More: http: //booksllc.net/?id=414887


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Product Details
  • ISBN-13: 9781156977231
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: IBM San Volume Controller, Comparison of Iscsi Targets, EMC Invista
  • Width: 229 mm
  • ISBN-10: 1156977231
  • Publisher Date: 15 Sep 2010
  • Binding: Paperback
  • Spine Width: 2 mm
  • Weight: 59 gr


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