Question

In RAID level 4, one block read, accesses __________.

a) only one disk
b) all disks simultaneously
c) all disks sequentially
d) None of these

Answer 1

option a,In RAID level 4, one block read accesses only one disk rather than engaging all disks simultaneously or sequentially. This configuration improves read performance as it allows multiple read requests to be satisfied in parallel.

Step-by-step explanation:

In RAID level 4, one block read accesses only one disk. RAID 4 uses a dedicated parity disk where parity information is stored. While it allows for simultaneous write operations across data disks, read operations do not require accessing all disks. Instead, each read operation is performed on a single disk to retrieve the desired data block.

This level of RAID offers improved read performance over RAID 3 because it does not need to engage all disks for a single block read, which allows multiple read requests to be satisfied in parallel from different disks.