|0||Striping across disks||Larger I/Os or throughput
Full utilization of disk array capacity
Good for read & write
|No fault tolerance
One disk fails, entire volume fails.
Cannot recover from failed disk.
|Usually 2-4 drives. Applications requiring high performance but non –critical data and low cost.|
|1||Mirroring||Highest fault tolerance.
Good for read
|Higher cost||Smaller applciations with high availability|
|0 + 1||Striping + Mirroring||Very high reliability
Good for read & write
|Higher cost||Samller applications with high performance|
|2||Inherently parallel mapping and protection technique. Mostly it is not deployed because it needs special disk futures. Disk production is not economical cost wise.|
|3||Data striped across disks. Min. 3 disks are required||Cost is lower than other redundant levels||Bottleneck for small I/O operations
RAID 3 is not found on all controllers.
|Large I/O request like CAD, CAM imaging.|
|4||Similar to Raid 3. Unlike Raid 3 it wirtes parity in a single disk.||Parity data for whole array requires just one disk.||Bottleneck for small I/O operations due to||Large file transfers|
|5||Calculates parity, and writes the data in stripes across disks. Rotational parity||Smaller datafiles high throughput.
Even if one disk fails system will be up and runing.
|Slower Write than Raid-3 and Raid-4.
Write performance poor. Recovery is slow.
|Very high read rate. Less write applications.
- RAID MATRIX
|Oracle files||Raid Levels|
|Parameter files||5 , 0+1 , ANY|
|Control files||5, 0+1, ANY|
|Redo logs||1, 0+1|
|System Tablespace||5,1, 0+1|
|Data files||5 , 0+1|
|Index Tablespace||5, 0+1|
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