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3/10/20AN OVERVIEWOF RAIDTECHNOLOGYBy Caleb HerbelWhat is RAID Redundant Array of Inexpensive Disks Developed at the University of California Berkeley in 1987 Better than Single Large Disk Added Redundancy Performance Improvements1
3/10/20Levels of RAID - IntroductionMost Common:Not Used Much: RAID 0 RAID 2 RAID 1 RAID 3 RAID 5 RAID 4 RAID 6RAID 0§ Data is striped§ Fastest Level for Reading and Writing§ No Data Redundancy2
3/10/20RAID 1§§§§Data is Mirrored ExactlyData RedundancyWriting isn’t fasterImproved performance withreadingParityBit Parity:Block Parity:Disk1 : 10100Disk2 : 01101Parity : 11001Disk 1 : 10100 1Disk 2 : 01101 0Parity: 11001 13
3/10/20RAID 2§ Hamming Code§ Discs Must be synced§ Not Used AnymoreRAID 3 & 4RAID 3§ Byte level striping§ Dedicated ParityRAID 4 Block level striping Dedicated Parity More I/O operations canbe executed in parallel4
3/10/20RAID 5 Block Level Striping Distributed Parity Faster than Raid 4 Better Protected againstdata lossRAID 6 Block Level Striping Double Distributed Parity Two Drives can Fail Better for Large Drives5
3/10/20Nested RAID RAID 01 RAID 03 RAID 10 RAID 50 RAID 60 RAID 100RAID System Controllers Hardware Controller– Dedicated Processing– Hot Swapping– Frees Disk Cache Controlled by Software– Uses the power of the system CPU– No additional hardware is required– Not restricted by Hardware Controller6
3/10/20Conclusion RAID is a powerful tool to increase performance and data redundancy Things to know– Failures rise proportionally with the number of disks.– Does not replace a system backup– More complicated Systems have more complicated problems Don’t use it for the computer in your apartment or dorm room (Probably).Sources https://commons.wikimedia.org/wiki/ https://www.wikiwand.com/en/Standard RAID levels ical-disk ware-raid-advantagesdisadvantages/ https://en.wikipedia.org/wiki/Cylinder-head-sector The sources listed on my paper7
Redundant Array of Inexpensive Disks Developed at the University of California Berkeley in 1987 Better than Single Large Disk Added Redundancy Performance Improvements. 3/10/20 2 Levels of RAID -Introduction Most Common: RAID 0 RAID 1 RAID 5 RAID 6 Not Used Much: RAID 2 RAID 3 RAID 4 RAID 0
