TestOut LabSim A+ Certification Practice Exam

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Which RAID level has both fault tolerance and good read performance with a minimum of three disks?

RAID 0
RAID 1
RAID 5
RAID 10

The correct answer is: RAID 5

RAID 5 is designed to provide a balance between fault tolerance and performance, making it a popular choice for many applications. It requires a minimum of three disks to operate effectively. In this configuration, data is striped across the disks, with parity information distributed among them. This means that if one disk fails, the data can still be reconstructed using the parity information stored on the remaining disks. This setup not only offers protection against data loss but also enhances read performance as multiple disks can be accessed simultaneously for reading data. The distributed parity allows for efficient use of disk space as well; it requires less additional storage for parity compared to other RAID configurations that might use mirroring. Options like RAID 0 do not provide fault tolerance as they strip data without any redundancy; RAID 1 offers fault tolerance through mirroring but requires double the storage, leading to inefficient use of disk space; RAID 10, while providing excellent redundancy and performance due to mirroring and striping, also requires a minimum of four disks. This makes RAID 5 the optimal choice for achieving both fault tolerance and solid read performance with a minimum of three disks.