RAID level for disk mirroring - Operating System

Q.  Operating System: Which RAID level refers to disk mirroring?
- Published on 19 Oct 15

a. 0
b. 1
c. 2
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ANSWER: 1

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  • Nirja Shah   -Posted on 23 Nov 15
    RAID 1
    - This is a fault-tolerance configuration known as "disk mirroring."

    - With this RAID 1, the data is copied seamlessly and simultaneously, from one disk to another, creating a replica, or mirror.

    - If one disk gets fired, the other can keep working.

    - It's one of the simplest way to implement fault tolerance and it's relatively low cost.

    - The downside of this RAID is that it causes a slight drag on performance.

    - It can be implemented through either software or hardware.

    - A minimum of two disks is required for its hardware implementations.

    - With this RAID, instead of two physical disks, data can be mirrored between volumes on a single disk.

    - It cuts the total disk capacity in half: If a server with two 1TB drives is configured with RAID 1, then total storage capacity will be 1TB not 2TB.

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