AWS Solutions Architect Associate Practice Test

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Which RAID configuration has the disadvantage of doubling the I/O required from the instance to EBS due to mirroring all writes?

Raid 0
RAID 1+0 (RAID 10)
Raid 1
Raid 2

The correct answer is: RAID 1+0 (RAID 10)

The correct choice is RAID 1, which is a configuration that creates an exact copy or mirror of a set of data on another disk. This mirroring process means that whenever data is written to one disk, it must also be written to the second disk, effectively doubling the input/output operations required. This can lead to increased write latencies and reduced performance during write-intensive operations due to the overhead associated with managing the additional write. In contrast, RAID 0 stripes data across disks but does not provide any redundancy, which means it does not have the same mirrored write overhead. RAID 1+0 (RAID 10) provides both striping and mirroring, which means that while it benefits from improved read performance, it also incurs the same mirroring write penalty as RAID 1. RAID 2, an older and less common RAID level, employs bit-level striping with Hamming code for error correction and is not typically discussed in modern AWS contexts. Thus, RAID 1 is indeed the setup that manifests the disadvantage of doubling I/O to EBS due to its mirroring nature.