22_Mass_Storage_IO_II

22_Mass_Storage_IO_II - CSC 4103 - Operating Systems Fall...

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1 CSC 4103 - Operating Systems Fall 2009 Tevfik Ko ! ar Louisiana State University November 12 th , 2009 Lecture - XXII Mass Storage and I/O - II RAID Structure • As disks get cheaper, adding multiple disks to the same system provides increased storage space , as well as increased reliability and performance . RAID: Redundant Array of Inexpensive Disks multiple disk drives provides reliability via redundancy . • RAID is arranged into six different levels. RAID (cont) • RAID schemes improve performance and improve the reliability of the storage system by storing redundant data. Data Striping: splitting each bit (or block) of a file across multiple disks. Mirroring (shadowing): duplicate each disk Simplest but most expensive approach Block interleaved parity uses much less redundancy. RAID Levels RAID Level 0 5 ! !
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22_Mass_Storage_IO_II - CSC 4103 - Operating Systems Fall...

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