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?
A.
RAID-1
B.
RAID-10
C.
RAID-0
D.
RAID-3
Explanation:
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 is incorrect. 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 is incorrect. 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 is incorrect. 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.