RAID

Hardware RAID Level 0: (Select all that apply)

• Requires a minimum of 2 drives to implement

• Is also known as disk striping

• Decreases reliability (failure of any disk in the array results in the loss of all data in the array)

•  Is suitable for systems where performance has higher priority than fault tolerance

Hardware RAID Level 1: (Select 3 answers)

• Requires at least 2 drives to implement

• Is also referred to as disk mirroring

• Offers improved reliability by creating identical data sets on each drive (failure of one drive does not destroy the array as each drive contains identical copy of the data) 

Hardware RAID Level 5: (Select 3 answers)

• Requires at least 3 drives to implemen

• Is also known as disk striping with parity

• Offers increased performance and fault tolerance (single drive failure does not destroy the array and lost data can be re-created by the remaining drives)

Hardware RAID Level 6: (Select 3 answers)

• Requires at least 4 drives to implement

• Is also known as disk striping with double parity

• Offers increased performance and fault tolerance (failure of up to 2 drives does not destroy the array and lost data can be re-created by the remaining drives)

Hardware RAID Level 10 (a.k.a. RAID 1+0): (Select 3 answers)

• Requires a minimum of 4 drives to implement

• Is referred to as stripe of mirrors, i.e., a combination of RAID 1 (disk mirroring) and RAID 0 (disk striping)

• Offers increased performance and fault tolerance (failure of one drive in each mirrored pair of disk drives does not destroy the array)

Which of the following RAID levels does not offer fault tolerance?

RAID 0