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RAID - Parity Disk1 Disk2 Disk3 Disk4 Disk5 3 4 6 1 14 5 6...

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RAID Dr. Carlos Ferran Fall II, 2007
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What is RAID? Redundant Array of Independent Disks Redundant Array of Inexpensive Disks A methodology to improve the speed and reliability of secondary on-line storage (hard drives)
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How does RAID work? Several physical drives User sees one “logical” hard drive A controller makes it transparent Could be hardware or software based
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Mechanisms Mirroring Stripping Parity
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RAID Level 0 Disk Striping No Redundancy Faster READ and WRITE
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RAID Level 1 Disk Mirroring 100% Redundancy Higher reliability Faster READ Same or slower WRITE
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RAID Level 5 Disk Striping with Parity Complex Redundancy Less Waste Higher reliability Higher READ and WRITE speeds
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Unformatted text preview: Parity Disk1 Disk2 Disk3 Disk4 Disk5 3 4 6 1 14 5 6 9 7 27 3 2 1 1 7 6 3 1 10 • Can save one disk • Cannot save more than one disk • 20% redundancy RAID There are many more levels with different combinations and additions So what? • Higher reliability • Higher Speed • Required for servers • Not a replacement for backup • Hotswap • Included as standard in current PCs Personal Outlook • RAID will be around for a few more years; until HD technology becomes much more reliable • RAID will be used even in single user PCs; nut just servers • New levels of RAID will be developed • Hotswap will be more prevalent...
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