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RAID Levels-Difference

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Published in: Basic Computer | Hardware Training
5,678 Views

Explains the differences between RAID 0, RAID 1, RAID 5 etc on the basis of the minimum number of disks, fault tolerance, advantages, disadvantages, application etc.

Abhay K / Kolkata

8 years of teaching experience

Qualification: M.Tech (NIT DURGAPUR - 2015)

Teaches: Algebra, Chemistry, Computer Science, IT & Computer Subjects, Mathematics, Physics, School Level Computer, Science, DSSB, IES Exam, Railways Exams, SSC Exams, WBCS

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  1. RAID RAID RAID RAID SNo PROPERTIES 2. 3. 4. 5. 6. 7. PRINCIPLE MINIMUM DISK REQUIRED FAULT TOLQANCE BENEFITS DISADVANTAGES FIGURE APPLICATIONS RAID O Sriping Two (2) None 1. Great performance, 2. All storage capacity used, 3. Easy to implemt No fault tolerant 5 Where data is not critical eg postproduction, CAD. RAID 1 M irroring Two (2) n-l drive 1 . excellent speed 2. very simple 3. if a drive fails just copy data of one to another. Effective storage capacity becom es half. RAID 5 Striping with parity Three ( two for data one for parity) One 1 . Read data transactions very fast 2. if a drive fails storage controllers rebuild data using parity. 1 .Com plex technology. 2.Data restoration takes too much time.lf 2nd drive fails then data is completely lost RAID 6 Striping with double parity Four (2 for data 2 for parity) Two 1 . Read data transactions very fast 2. if two drive fails storage controllers rebuild data on replacement drive. 3. More secure than RAID 5 1 .Write data transaction slower than RAID 5 2. very complex technology. RAID 10 Mirroring and Sriping Four One drive in each subarray 1 .com bines advantage of RAIDO And RAID I in one system . 2. provides data security by mirroring and speed up by striping. 1 .Lower usable capacity 2. High Cost 3. Limited scalability A2 Al A2 BLOCK BLOCK Cl BLOCK 32 ga-ocK 02 02 BLOCK $3 BLOCK oa c. Disk I Disk 2 Disk O Disk 2 AS 013k 3 Disk* Accounting, gam ing video editing etc Fileservers, storage servers, strimming data etc Fileserver, general storage servers, backup servers. Database servers. RAID- Redundant Array of Independent Disks. Raid 2, 3,4 are rarely used.

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