Question

A write of a block has to access : (choose all that apply)

a) the disk on which the block is stored
b) parity disk
c) a parity block
d) All of these

Answer 1

During a write operation of a block, the disk where the block is stored is accessed, and in RAID configurations with parity, the parity disk or parity block are also accessed to maintain data redundancy.

Step-by-step explanation:

When a write operation of a block occurs in a storage system, a few actions are typically required. If it's a simple storage system, just the disk on which the block is stored needs to be accessed.

However, in the context of a redundant array of independent disks (RAID), particularly RAID levels that include parity such as RAID 5 or RAID 6, additional actions are needed. For RAID systems, a parity disk or a parity block might also need to be accessed to update the parity information, ensuring data redundancy and integrity. In summary, for a write operation in a RAID system, all of the listed options might be true: the disk, parity disk, and a parity block may need to be accessed.