ITPEC IP October 2019 Question 14
Two (2) HDDs are connected to a server. If only one (1) of the HDDs fails, the operation needs to be able to continue. Which of the following is an appropriate configuration that should be used?
Explanation
Mirroring — writing the same data to both HDDs keeps it available as long as either disk works.
Mirroring (RAID 1) writes every piece of data to both disks, so each holds a complete copy. If one HDD fails, the server continues with the other and no data is lost. The price is capacity: two disks give the usable space of one.
Answer (d)
Why not others:
- •(a) Striping — (RAID 0) splits data into blocks spread across both disks for speed; each disk holds only part of the data, so losing either disk loses it
- •(b) Data mining — analysing large volumes of stored data to discover patterns; not a disk configuration
- •(c) Tethering — sharing a smartphone's mobile connection with a PC or other device; unrelated to storage
Key rule: Mirroring (RAID 1) duplicates data and survives the failure of one disk; striping (RAID 0) only improves speed and has no redundancy.
System Component · AI-written, may contain errors
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