ITPEC FE Morning April 2018 Question 13

Striping — logically sequential data is split into blocks written across several disks, so the disks transfer in parallel.

With striping (RAID 0), block 1 goes to disk 1, block 2 to disk 2, and so on. A large read or write is served by all the disks at once, which raises throughput. It adds no redundancy, so losing any one disk loses the data.

Answer (c)

Why not others:

• •(a) Disk cache — keeps recently used disk data in faster memory; it speeds access without spreading data over several disks
• •(b) Mirroring — writes the same data to two disks (RAID 1) for reliability; the data is copied, not divided
• •(d) Swapping — moves whole processes between main memory and auxiliary storage to free memory; it is memory management, not disk layout

Key rule: Striping divides data across disks for speed; mirroring copies it to each disk for reliability; parity RAID levels combine striping with recovery data.

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