RAID Level Selector — TechKnowSurge

About this interactive

What you're doing: sorting thirteen real business scenarios into the RAID level that fits each one — 0, 1, 5, 6, or 10. Why it matters: RAID is a trade-off, not a ranking. Every level buys you speed, redundancy, or usable capacity by giving up one of the others, so the "best" level is only ever the best for a stated requirement. How to use it: read what each scenario actually demands — drive count, tolerance for downtime, budget, whether a backup already exists — and drop it in the matching bin. Watch for the scenarios where a separate backup already covers redundancy: those are the ones where RAID 0 is the right answer rather than a reckless one.

What you'll learn

Select the appropriate RAID level (0/1/5/6/10) for a given scenario, weighing speed, redundancy, and usable capacity against each other
Identify the defining characteristic of each level — 0 is striping, 1 is mirroring, 5 is single parity, 6 is dual parity, 10 is striped mirrors
Recognize that RAID provides fault tolerance, not backup, and that neither one substitutes for the other

Aligned to

CompTIA A+ Core 1

3.3 Given a scenario, select and install storage devices.

5.3 Given a scenario, troubleshoot and diagnose problems with storage drives and RAID arrays.

CompTIA Tech+

2.5 Compare and contrast storage types.

CompTIA A+ Core 2

4.3 Given a scenario, implement workstation backup and recovery methods.

Key terms

RAID 0: A RAID configuration that stripes data across two or more drives to improve read and write performance, but provides no fault tolerance — losing any one drive loses all data.
RAID 1: A RAID configuration that mirrors identical data simultaneously across two drives, providing full redundancy so that the array continues operating if either drive fails.
RAID 5: A RAID configuration that stripes data and distributed parity across three or more drives, providing read performance gains and the ability to survive the failure of any single drive.
RAID 6: A RAID configuration that stripes data across four or more drives with two independent sets of parity, allowing the array to survive the simultaneous failure of any two drives.
RAID 10: A RAID level that combines striping and mirroring, delivering both improved performance and redundancy but requiring a minimum of four drives.
Striping: A RAID technique that splits data across two or more drives to increase read and write performance, but provides no redundancy.
Mirroring: A RAID technique that writes identical copies of data to two or more drives simultaneously so that if one drive fails the other contains a complete working copy; provides redundancy without improving write speed.
Parity: Calculated redundancy data stored across drives in certain RAID levels that allows the array to reconstruct lost data mathematically if a single drive fails.
Fault Tolerance: A design property that allows a system to continue operating correctly even when one or more of its components fail, achieved through techniques such as redundancy and failover.
Redundancy: The duplication of critical components or systems to increase reliability and availability.

Topics

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