Which of the following RAID levels provides best performance because data read and data write operations
are not limited to a single disk, but to a set of disks?
RAID-0, also known as disk striping, is made up of a disk set in which data is divided into blocks and spread
equally in each disk. It provides best performance because data read and data write operations are not
limited to a single disk, but to a set of disks.
It does not provide data redundancy.
Data once lost cannot be recovered.
A: RAID-1 is a type of RAID (Redundant Array of Independent Disks) for standardizing and categorizing
fault-tolerant disk systems by using disk mirroring. In mirroring, data is kept on two physical disks. It copies
data of one volume to another volume on a different disk. If a disk fails, the computer continues to operate
using the unaffected disk. The data writing operation is performed on the primary disk as well as on the
mirror disk. The mirror disk has identical data image of the primary disk. This type of disk system provides
best fault tolerance, but lower writing performance.
D: RAID-3 is a fault tolerant volume that strips data across multiple disks. It provides byte-level striping and
complete data redundancy through a dedicated parity disk. RAID- 3 is constructed in the same way as
RAID-5 except that RAID-5 distributes parity on all the disks.
B: RAID-10 is a combination of RAID-1 and RAID-0. It is implemented at hardware level rather than on the
operating system. It is used to connect mirrored disk pairs to form a RAID-0 array. Data is written on the
striped set of disk array as in RAID-0 and then it is mirrored as in RAID-1. Although expensive, RAID-10
provides better fault tolerance as well as input/output performance.