SK0-003 · Question #821
Which of the following is a characteristic of software disk mirroring?
The correct answer is A. It will slow down writes but speed up reads.. Software disk mirroring (RAID 1) duplicates data across two drives, resulting in slower write operations due to dual writes but potentially faster reads as data can be accessed from either disk.
Question
Which of the following is a characteristic of software disk mirroring?
Options
- AIt will slow down writes but speed up reads.
- BIt will slow down reads but speed up writes.
- CIt can be extended to increase size.
- DIt requires two disk controllers.
How the community answered
(58 responses)- A86% (50)
- B3% (2)
- C3% (2)
- D7% (4)
Why each option
Software disk mirroring (RAID 1) duplicates data across two drives, resulting in slower write operations due to dual writes but potentially faster reads as data can be accessed from either disk.
In disk mirroring (RAID 1), data is written identically to two separate disks. This process inherently slows down write operations because the system must wait for the data to be successfully written to both disks. However, read operations can be faster because the system can read data from either of the mirrored disks simultaneously or choose the disk with the fastest response time.
This is the opposite of how mirroring affects read and write performance; writes are typically slower, and reads can be faster.
Mirroring focuses on redundancy and does not natively support extending the logical volume size by adding more mirrored drives without reconfiguring the RAID.
While two controllers offer redundancy, software disk mirroring itself can function with a single disk controller, provided there are two disks attached to it.
Concept tested: RAID 1 performance characteristics
Source: https://learn.microsoft.com/en-us/windows-server/storage/disk-management/create-a-mirrored-volume
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