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ISRO2007-56

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RAID levels comparison chart

    RAID 1 RAID 5 RAID 6  
Min number of disks   2 3 4  
Fault to­le­ran­ce   1 disk 1 disk 2 disks  
Disk space over­head   50% 1 disk 2 disks  
Read speed   Fast Slow,   
Write speed   Fair Slow,  Fair
Hard­ware cost   High (disks) High Very high

RAID levels 2, 3, and 4 are theoretically defined but not used in practice. so ans should be A

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